US20070142619A1 - Forming electrical contacts to a molecular layer - Google Patents
Forming electrical contacts to a molecular layer Download PDFInfo
- Publication number
- US20070142619A1 US20070142619A1 US11/677,403 US67740307A US2007142619A1 US 20070142619 A1 US20070142619 A1 US 20070142619A1 US 67740307 A US67740307 A US 67740307A US 2007142619 A1 US2007142619 A1 US 2007142619A1
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- molecules
- layer
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- metal layer
- conductive
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/701—Organic molecular electronic devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
- H01L21/2003—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy characterised by the substrate
- H01L21/2007—Bonding of semiconductor wafers to insulating substrates or to semiconducting substrates using an intermediate insulating layer
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
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- H10K10/40—Organic transistors
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- H10K10/462—Insulated gate field-effect transistors [IGFETs]
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- H10K10/40—Organic transistors
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- H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
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- H10K19/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00
- H10K19/10—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00 comprising field-effect transistors
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- H10K71/50—Forming devices by joining two substrates together, e.g. lamination techniques
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- H10K71/60—Forming conductive regions or layers, e.g. electrodes
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- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/464—Lateral top-gate IGFETs comprising only a single gate
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- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/466—Lateral bottom-gate IGFETs comprising only a single gate
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/18—Deposition of organic active material using non-liquid printing techniques, e.g. thermal transfer printing from a donor sheet
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- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
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Definitions
- the present invention is directed, in general, to forming reliable contacts in nanoscale devices. Specifically, the invention is directed to a process for forming electrical contacts to a molecular layer in a nanoscale electrical device, to the device so formed, and to a method of manufacturing an integrated circuit comprising the nanoscale device.
- polymeric electronic devices may be more physically flexible and more cost and processing-efficient than conventional inorganic semiconductor devices.
- the molecules are typically fixed at one end to a conducive substrate that forms one electrical contact for the device, and to a metal layer on the other end to form a second electrical contact.
- Conventional processes for depositing the metal onto the molecules include treatment with a metal containing solution, to produce a colloidal metal layer, or evaporation of the metal onto the molecules, to produce an evaporated metal layer.
- the molecules are typically able to rotate about the first electrical contact. Both the presence of gaps, and the ability of molecules to rotate, impede the attachment of the deposited metal layer to form the second electrical contact. Some of the deposited metal, for example, goes between the gaps between molecules, resulting in an electrical short circuit between the conductive substrate and metal layer.
- one embodiment of the present invention provides a process for forming electrical contacts to a molecular layer.
- the process comprises
- the process further comprise placing the other of the conductive or semiconductive substrate or the metal layer in contact with the attached layer of anchored molecules, the conductive or semiconductive substrate or the metal layer covalently bonding to free ends of the anchored molecules.
- the invention further provides a nanoscale electronic device, comprising a conductive or semiconductive substrate, a layer of anchored molecules and a printed metal layer.
- the layer of anchored molecules has first and second ends, the first ends of the molecules being covalently anchored to the conductive or semiconductive substrate, and the second ends able to rotate about the anchored first ends.
- the printed metal layer is covalently coupled to the second ends of the layer of anchored molecules.
- Yet another embodiment of the present invention provides a method for manufacturing an integrated circuit.
- the method comprises forming active devices and interconnecting the devices to form an operative integrated circuit.
- Forming the active devices includes forming conductive electrodes on or in a substrate and forming a conductive or semiconductive layer over the conductive electrode and the substrate.
- a layer of molecules having first and second ends is formed by anchoring the first ends to the conductive or semiconductive substrate and wherein the second ends able to rotate about the anchored first ends.
- Forming the active devices further includes imprinting a gate electrode by contacting a stamp having a metal layer located thereon with the second ends of the layer of molecules to form a bond between the metal layer and the second ends.
- FIGS. 1A to 1 D illustrate a process for forming electrical contacts to a molecular layer according to the present invention
- FIG. 2 illustrates components in a nanoscale electronic device of the present invention
- FIG. 3 illustrate, a method for forming an integrated circuit, which may form one environment where a device similar to that shown in FIG. 2 , is included;
- FIG. 4 illustrates the relationship between current density and voltage for devices made according to the present invention having various contact areas
- FIG. 5 illustrates selected results for: (A and B) reference devices; (C and D) conventionally made devices; or (E) devices of the present invention.
- FIG. 6 illustrate the reliability of the process of the present invention to produce devices having a certain contact resistance.
- the present invention recognizes the advantageous use of using a nanotransfer printing procedure for forming electrical contacts to a molecular layer.
- the procedure for forming nanoscale patterned thin film metal layers is disclosed in the above mentioned U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471, incorporated herein by reference. It has been discovered that this procedure as adapted to the present invention allows for the reliable production of nanoscale devices, which in turn may be incorporated into an integrated circuit.
- FIG. 1A illustrated is a stamp 100 and the coating of a surface 110 of the stamp 100 with a metal layer 120 .
- the process for forming the stamp 100 has been disclosed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471, as incorporated above. Briefly, the process may include forming a pattern on a template, the pattern comprising raised and relief portions.
- the template is coated with a prepolymer and a catalytic agent, preferably with a mixture of the prepolymer and catalytic agent.
- the prepolymer is then cured to form an elastomeric rubber.
- the elastomeric rubber is peeled away from the template to form the stamp 100 .
- At least one surface 110 of the stamp 100 comprises raised portions 103 , corresponding to relief portions of the template, and relief portions 107 , corresponding to raised portions of the template.
- the stamp 100 may be attached to a polymer substrate 130 such as poly(ethylene terephthalate), as disclosed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471.
- the coating of the stamp 100 with the metal layer 120 may be conducted using any conventional process well known to those of ordinary skill in the art.
- coating may be achieved by treating the surface 110 of the stamp 100 with a solution containing ions corresponding to the metal layer 120 .
- coating may be accomplished by metal evaporation: evaporating metal vapors onto to the surface 110 of the stamp 100 , using, for example, conventional thermal and electron beam evaporation techniques.
- the coating is performed for a sufficient period to form a metal layer 120 about 200 to about 300 Angstroms thickness 125 .
- thicker metal layers may be produced according to the present invention, for example, by using a hard material for fabricating the stamp 100 . It is also preferable to mount the stamp 100 directly above the source so that the evaporated metal only covers the raised and recessed regions of the stamp 100 , and not the sidewalls 109 .
- FIG. 1B illustrated is the formation of an attached layer of anchored molecules 140 by coupling first ends of the anchored molecules 143 to a conductive or semiconductive substrate 150 , for example by covalent bonding.
- the coupling may be accomplishing using any conventional process that will result in substantially all sites on the surface 155 of the conductive or semiconductive substrate 150 being coupled to the first ends 143 of the molecule 140 .
- coupling may be achieved by placing a surface 155 of the conductive or semiconductive substrate 150 in contact with a solution containing the molecules 140 .
- the molecules 140 may be dissolved in a solvent, such as ethanol or similar organic solvent.
- coupling is performed by placing the conductive or semiconductive substrate 150 in a chamber 160 and placing a source 165 of the molecules 140 in the chamber 160 .
- the substrate may undergo surface treatments. It is preferable, for example, for a GaAs substrate to be etched prior to deposition of the molecules 140 .
- the source 165 may be for example, a petri dish containing a sufficient amount of molecules 140 to ensure substantially complete coverage of the conductive or semiconductive substrate 150 .
- the chamber 160 is then maintained at a temperature and pressure sufficient to allowing coupling between the first ends of the molecule 143 and the substrate 150 . In certain preferred embodiments, for example, the chamber 160 is maintained at room temperature (i.e., about 23° C.), and a pressure of less than about 0.001 Torr for at least about 15 minutes.
- FIG. 1C illustrated is placing the metal layer 120 in contact with the attached layer of anchored molecules 140 , the metal layer 120 chemically bonding to free ends of the anchored molecules 147 .
- Chemically bonding between the free ends 147 and the metal layer 120 occurs rapidly and without further processing steps. For example, contacting the anchored layer of molecules 140 and the metal layer 120 may be done at room temperature ( ⁇ 23° C.) in room air. Similarly, no additional force need be applied other than the inherent contact between the stamp 100 and the substrate 150 .
- Contact is maintained for a period sufficient to ensure substantially complete chemical bonding of the metal layer 120 to free ends of the anchored molecules 147 .
- placing the metal layer 120 in contact with the attached layer of anchored molecules 140 occurs for less than about 15 seconds, and more preferably less than about 3 seconds.
- the stamp 100 is peeled away from the substrate 150 to yield a substrate 150 having metal layers 170 covalently bonded to the anchored molecules 140 in discrete locations corresponding to raised portions 103 on the stamp 100 ( FIG. 1D ).
- the stamp 100 bearing the metal layer 110 may be placed in chamber 160 , and the first ends 143 of the molecules 140 coupled to the metal layer 110 .
- the stamp 100 bearing metal layer 110 and molecules 140 attached thereto, are then contacted to the conductive or semiconductive substrate 150 .
- Contact is for a sufficient period to ensure complete chemical bonding of the conductive or semiconductive substrate 150 to free ends of the anchored molecules 147 .
- the stamp 100 is peeled away from the substrate 150 to yield a substrate 150 having metal layers 170 covalently bonded to the anchored molecules 140 in discrete locations corresponding to raised portions 103 on the stamp 100 , similar to that depicted in FIG. 1D , with the exception that there are substantially no anchored molecules 141 attached to the conductive or semiconductive substrate 150 that are also not attached to the metal 170 .
- FIG. 2 Another embodiment of the present invention, illustrated in FIG. 2 , is a nanoscale electronic device 200 .
- the device 200 may include a conductive or semiconductive substrate 250 and a layer of anchored molecules 240 having first 243 and second ends 247 , the first ends 243 of the molecules 240 being anchored to the conductive or semiconductive substrate 250 .
- the second ends 247 are able to rotate about the anchored first ends 243 .
- the device 200 further includes a printed metal layer 270 coupled to the second ends 247 of the layer of anchored molecules 240 , by covalent bonding, for example.
- printed metal layer 270 refers to a metal layer covalently associated with the anchored molecules and forming a substantially uniform blanket coverage over the anchored molecules 240 , at discrete locations on the substrate 250 , as defined by the raised pattern on the stamp 100 , as discussed elsewhere herein.
- the anchored molecules 240 of the device 200 may be comprised of one or more compounds characterized by the chemical formula: F′—(R) n —F′′
- F′ comprises the first end 243 wherein the first end 243 comprises a first functional moiety capable of chemically bonding to the conductive or semiconductive substrate 250 .
- F′′ comprises the second end 247 wherein the second end 247 comprises a second functional moiety capable of chemically bonding to the metal layer 270 .
- R comprises a bridge 245 covalently linking the first 243 and second ends 247 , where R 245 comprises individually substituted or unsubstituted nonreactive chemical groups, and 0 ⁇ n ⁇ 50.
- the first functional moieties may comprise any functional groups that would facilitate the formation of covalent bonds between the conductive or semiconductive substrate 250 and the first ends 243 of the molecule 240 .
- the first functional moieties are selected from the group consisting of thiols, monocarboxylates, dicarboxylates and alkoxides.
- the selection of first functional groups may vary according the chemical composition of the substrate 250 . For example, if the substrate 250 is composed of gallium arsenide, then the first functional moieties preferably comprise thiols, monocarboxylates or dicarboxylates. Alternatively, if the substrate 250 is composed of gold, then the first functional moieties preferably comprise thiols. Or, if the substrate 250 is composed of silicon, then the first functional moieties preferably comprise alkoxides.
- the second functional moieties may comprise any functional groups that would facilitate the formation of covalent bonds between the printed metal layer 270 and the second ends 247 of the molecule 240 .
- the second functional moieties are selected from the group consisting of thiols and disulfides.
- the bridge 245 may comprise any chemical composition comprising non metal atoms that covalently links the first 243 and second ends 247 .
- R may comprise nonmetals moieties such as, —C 6 H 4 —, —CH 2 —, —NH—, or —O—, that are repeated n times. These nonmetal moieties may be unsubstituted or substituted.
- R comprises an alkane group having the chemical formula: (—CH 2 —) or an aromatic having the chemical formula: (—C 6 H 4 —), and 1 ⁇ n ⁇ 25.
- the molecule 240 should be sufficiently volatile that when placed in chamber 160 ( FIG. 1C ) the molecule will enter the gas phase in sufficient concentrations to couple to and coat the entire substrate 240 within an acceptable period.
- the molecule 240 should be a liquid or sufficiently soluble in a solvent, so as to couple to and coat the entire substrate 250 when the liquid or solution is contacted with the substrate 250 .
- the printed metal layer 270 may comprise any metal that can covalently couple the molecule 240 and provide an electrical contact between the device 200 and other electrical components.
- the printed metal 220 layer is selected from the group consisting of Gold, Silver, Copper, Platinum, Palladium, Tungsten, Aluminum and alloys thereof.
- the conductive or semiconductive substrate 250 may comprise any material that can covalently couple to the molecule 240 and provide an electrical contact between the device 200 and other electrical components.
- conductive or semiconductive substrate 250 is selected from the group consisting of Gallium Arsenide, Silicon, Indium Phosphide, Gold, and Tungsten Oxide.
- substrates 250 such as Silicon or Gallium Arsenide, may be further contain a conventional dopant introduced using conventional techniques, to increase its conductivity.
- the printed metal layer 270 and the conductive or semiconductive substrate 250 form electrical contacts for the device 200 .
- the layer of anchored molecules 240 forms a one of a channel and a gate dielectric
- the conductive or semiconductive substrate 250 forms the other of a first electrode and a channel
- the printed metal layer 250 forms a second electrode of a field effect transistor.
- Yet another embodiment of the device 200 of the present invention comprises the conductive or semiconductive substrate 250 and the layer of anchored molecules 240 .
- the anchored molecules 240 have a reactive end, substantially similar to the above described first end 243 , and a nonreactive end, substantially similar to the above-described bridge 245 .
- the reactive end 243 is covalently anchored to the semiconductive substrate 250 , while the nonreactive end 245 is able to rotate about the reactive end 243 .
- the device further includes a printed metal layer 270 laminated to the nonreactive ends 245 of the layer of anchored molecules 240 , using conventional techniques well known to those skilled in the art, as further discussed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471.
- the anchored molecules 240 may comprise one or more compounds characterized by the chemical formula: F′—(R) n .
- F′ comprises the reactive end 243 where the reactive end, F′ comprises a functional moiety capable of chemically bonding to the semiconductive substrate 250 .
- the non-reactive end 245 , R comprises individually substituted or unsubstituted non-reactive chemical groups and 0 ⁇ n ⁇ 50.
- devices 200 of the present invention can be efficiently fabricated with fewer defects than previously obtained from conventional devices.
- the device 200 of the present invention may have a contact resistance between the printed metal layer 220 and the conductive or semiconductive substrate 250 that is at least about 10, more preferably 100, and even more preferably 1000 times higher than a contact resistance for a substantially identical device except having an evaporated metal layer or colloidal metal layer.
- Yet another embodiment of the present invention is a method for manufacturing an integrated circuit.
- the method comprises forming active devices and interconnecting said devices to form an operative integrated circuit.
- active devices include, for example, field effect transistors (FET), Metal Oxide Semiconductor Field-Effect Transistor MOSFET, Complementary Metal Oxide Semiconductor (CMOS), bipolar transistors, diodes and similar devices, and therefore the details of such assembly steps are not presented here.
- CMOS Complementary Metal Oxide Semiconductor
- FIG. 3 illustrates a selected view of a method for forming active devices 300 in the integrated circuit. Any of the embodiments of process and devices discussed herein may be used to form the active devices 300 , and then interconnecting the devices to form an operative integrated circuit.
- nanoscale devices 200 having a molecular layer 240 FIG. 2
- Forming the active devices 300 includes forming conductive electrodes 385 , 390 (e.g., source and drain) on or in a substrate 395 .
- a conductive or semiconductive layer 350 is formed over the conductive electrodes 385 , 390 and the substrate 395 .
- a layer of molecules 340 acting as a dielectric, is formed by covalently anchoring a layer of the molecules 340 having first and second ends, 343 , 347 , the first ends 343 of the molecules being anchored to the conductive or semiconductive substrate 350 and the second ends 347 able to rotate about the anchored first ends 343 .
- Forming the device further includes imprinting an electrode 370 , such as a gate electrode, by contacting a stamp 100 , such as that shown in FIG. 1A , having a metal layer located thereon with the second ends 347 of the layer of molecules 340 to form a bond, for example a covalent bond, between the metal layer 370 and the second ends 347 .
- the present invention allows for the efficient production of integrated circuits with a low number of non functioning nanoscale device components.
- the method results in at least about 99% of nanoscale devices 200 , that may be incorporated into a transistor 300 , have a contact resistance between the printed metal layer 270 and the conductive or semiconductive substrate 250 , comprising GaAs for example, of greater than about 1 ⁇ 10 5 ohm cm 2 .
- the method results in at least about 99% of the formed nanoscale devices 200 , have a contact resistance that agree within a factor of about 2 units.
- Nanoscale devices having different contact areas were fabricated using the processes described herein. Specifically, the conductive substrate comprised GaAs, the anchored molecules comprised 1,8 octane dithiol and the printed metal layer comprised gold.
- the rubber elastomeric stamp was fabricated as described elsewhere herein and in Loo et al., using a prepolymer comprising polydimethyl siloxane and platinum catalyst (Sylgard 184 Elastomer Kit, Dow-Corning, Midland, Mich.).
- the stamp was coated with gold ( ⁇ 10 Angstrom/s) using conventional thermal evaporation using an electron beam, a pure gold target ( ⁇ 99.9999 wt % purity) and pressure of 10 ⁇ 7 Torr, at room temperature for about 20 to about 30 s.
- GaAs substrates were etched with either concentrated HCl or NH 3 OH (either at ⁇ 30 wt %) for about 2 min, rinsed with deionized water and dried, prior to forming an attached layer of anchored molecules.
- the GaAs substrates were placed in a commercial desiccator, and about 2-3 drops of 1,8 octane dithiol was added to a petri dish located in the desiccator. A vacuum was formed in the desiccator using a house vacuum ( ⁇ 0.001 Torr) for about 15 minutes.
- the GaAs substrate was then removed from the desiccator rinsed with ethanol and dried over nitrogen gas. After drying, the gold-layered stamp was contacted with the substrate for between about 2 and about 15 seconds. The stamp was then peel off the substrate to yield the nanoscale device. As a routine test to ensure that the gold layer was chemically bonding to free ends of the 1,8 octane dithiol, selected devices were adhered to adhesive tape (Scotch Tape®, 3M Company, St. Paul, Minn.) and the tape was examined for the absence of gold.
- adhesive tape Scotch Tape®, 3M Company, St. Paul, Minn.
- FIG. 4 illustrates selected results showing the relationship between current density and voltage for devices made according to the present invention having various contact areas.
- the relationship between current density and voltage was nearly the same for contact areas ranging from about 62.5 microns by 62.5 microns (i.e., 2.5 mil ⁇ 2.5 mil) to about 500 microns by 500 microns (i.e., 20 mil ⁇ 20 mil). This indicates that the method for measuring voltage and current across the nanoscale devices was reproducible.
- FIG. 5 illustrates selected results for: (A and B) reference devices (ref); (C and D) conventionally made devices (prior art); or (E) devices of the present invention.
- the reference devices comprised gold evaporated onto to GaAs substrates, with no intervening molecular layer.
- the conventionally made devices comprised substantially identical devices as the present invention except having an evaporated metal layer onto the GaAs substrate with 1,8 octane dithiol anchored thereto.
- the gold was evaporated onto the substrate using the same thermal evaporation methodology as described in the first experiment for coating the stamp. Evaporation was done at either: (C) room temperature ( ⁇ 23° C.) or (D) about ⁇ 15° C.
- the devices of the present invention were prepared substantial the same as described in the first experiment.
- FIG. 5 shows that the current passing through the conventionally made devices (C & D) was only about one order of magnitude less than the reference devices (A & B). In contrast, substantially less current (i.e., about 3 orders of magnitude) passes through the devices of the present invention (E; traced up and then down) as compared to conventionally made devices (C & D).
- Contact resistance was calculated from data such as that illustrated in FIG. 5 , by determining resistance from the slope of plots of current versus voltage, using data from about ⁇ 0.1 V to about 0.0 V, and multiplying resistance by the area of the contact (i.e., area of GaAs and gold layer).
- Representative contact resistances (RA) for the devices depicted in FIG. 5 are summarized in TABLE 1. Standard deviations reported in TABLE 1 are based on the standard deviation of the slope of current versus voltage data, as determined by linear regression analysis.
- a third series of experiments was conducted to examine the reliability of the process of the present invention to produce devices having a certain contact resistance.
- About 100 nanoscale devices were produced in a similar manner as described in the first experiment.
- a device having a substantial number of shorts is expected to have a contact resistance of less than about 1 ⁇ 10 3 ohm cm 2 .
- FIG. 6 show the result of the experiment.
- Counts refers the number of devices having a Log 10 (RA) value within 0.5 unit ranges depicted horizontal scale in FIG. 6 .
- All devices tested had a contact resistance between the printed gold layer and the GaAs substrate of greater than about 1 ⁇ 10 5 ohm cm 2 . Likewise all of the devices had a contact resistance within a factor of about 2 units.
Abstract
The present invention provides a process for forming electrical contacts to a molecular layer in a nanoscale device, the nanoscale device, and a method of manufacturing an integrated circuit comprise such devices. The process includes coating a surface of a stamp with a metal layer and forming an attached layer of anchored molecules by coupling first ends of the anchored molecules to a conductive or semiconductive substrate. The process also includes placing the metal layer in contact with the attached layer of anchored molecules such that the metal layer chemically bonds to free ends of the anchored molecules. The resulting devices produced have superior reliability as compared to conventional prepared devices.
Description
- This application is a Divisional of prior application Ser. No. 10/307,642, entitled “FORMING ELECTRICAL CONTACTS TO A MOLECULAR LAYER,” filed on Dec. 2, 2002, currently pending, to Julia Wan-Ping Hsu, which is a continuation in part of U.S. patent application Ser. No. 10/178,471, entitled “FORMING ELECTRICAL CONTACTS TO A MOLECULAR LAYER,” filed on Jun. 24, 2002, and with U.S. patent application Ser. No. 10/098,202, filed Mar. 15, 2002, “FORMING NANOSCALE PATTERNED THIN FILM METAL LAYERS,” and patent application Ser. No. 10/098,201, filed Mar. 15, 2002, “THIN FILM TRANSISTORS.” The above-listed application is commonly assigned with the present invention and is incorporated herein by reference as if reproduced herein in its entirety under Rule 1.53(b).
- The present invention is directed, in general, to forming reliable contacts in nanoscale devices. Specifically, the invention is directed to a process for forming electrical contacts to a molecular layer in a nanoscale electrical device, to the device so formed, and to a method of manufacturing an integrated circuit comprising the nanoscale device.
- There is currently great interest in the development of molecular or nanoscale electrical devices. To this end, much effort has been devoted to developing nanoscale electronic devices using organic materials including small molecules and polymers. In addition to providing higher device densities in integrated circuits, polymeric electronic devices may be more physically flexible and more cost and processing-efficient than conventional inorganic semiconductor devices.
- In such nanoscale electronic devices, single molecular layers may form active elements in the device. The efficient formation of reliable electrical contacts to the molecular layer is therefore an important aspect in the commercial production of nanoscale devices. The molecules are typically fixed at one end to a conducive substrate that forms one electrical contact for the device, and to a metal layer on the other end to form a second electrical contact. Conventional processes for depositing the metal onto the molecules include treatment with a metal containing solution, to produce a colloidal metal layer, or evaporation of the metal onto the molecules, to produce an evaporated metal layer.
- There may be, however, gaps between the molecules. In addition, the molecules are typically able to rotate about the first electrical contact. Both the presence of gaps, and the ability of molecules to rotate, impede the attachment of the deposited metal layer to form the second electrical contact. Some of the deposited metal, for example, goes between the gaps between molecules, resulting in an electrical short circuit between the conductive substrate and metal layer.
- Furthermore, methods based on treatments with solutions of colloidal metal particles do not produce connections to all the molecules because solution-transported metal particles may attach to randomly distributed single molecules rather than to substantially all of the molecules. Methods based on the direct evaporation of metal onto the molecules are also problematic, because the high kinetic energy of the metal atoms striking the molecules may destroy or alter the structure of the molecular layer. Efforts to reduce the deleterious effects of direct evaporation, such as low temperature evaporation, or shallow angle evaporation, have not improved the production of non-defective devices to satisfactory levels. As a result, conventional processes for the deposition of the metal layer continue to produce a large number of nonfunctional devices, as indicated, for example, by the devices having an undesirably low resistance across the molecular layer. Of all devices produced in a typical conventional process, for instance, only 2% may be functional.
- Therefore, previously proposed methods of attaching electrical contacts to a layer of molecules lack the desired reliability demanded by today's electronics industry. Accordingly, what is needed in the art is a method of forming such contacts, thereby increasing the efficient production of nanoscale electrical devices, while not experiencing the problems associated with previous methods.
- To address the above-discussed deficiencies, one embodiment of the present invention provides a process for forming electrical contacts to a molecular layer. The process comprises
- coating a surface of a stamp with a metal layer and forming an attached layer of anchored molecules by covalently bonding first ends of the anchored molecules to one of either a conductive or semiconductive substrate or the metal layer. The process further comprise placing the other of the conductive or semiconductive substrate or the metal layer in contact with the attached layer of anchored molecules, the conductive or semiconductive substrate or the metal layer covalently bonding to free ends of the anchored molecules.
- In another embodiment, the invention further provides a nanoscale electronic device, comprising a conductive or semiconductive substrate, a layer of anchored molecules and a printed metal layer. The layer of anchored molecules has first and second ends, the first ends of the molecules being covalently anchored to the conductive or semiconductive substrate, and the second ends able to rotate about the anchored first ends. The printed metal layer is covalently coupled to the second ends of the layer of anchored molecules.
- Yet another embodiment of the present invention provides a method for manufacturing an integrated circuit. The method comprises forming active devices and interconnecting the devices to form an operative integrated circuit. Forming the active devices includes forming conductive electrodes on or in a substrate and forming a conductive or semiconductive layer over the conductive electrode and the substrate. A layer of molecules having first and second ends is formed by anchoring the first ends to the conductive or semiconductive substrate and wherein the second ends able to rotate about the anchored first ends. Forming the active devices further includes imprinting a gate electrode by contacting a stamp having a metal layer located thereon with the second ends of the layer of molecules to form a bond between the metal layer and the second ends.
- The foregoing has outlined preferred and alternative features of the present invention so that those skilled in the art may better understand the detailed description of the invention that follows. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing or modifying other structures for carrying out the same purposes of the present invention. Those skilled in the art should also realize that such equivalent constructions do not depart from the scope of the invention.
- The invention is best understood from the following detailed description, when read with the accompanying FIGUREs. It is emphasized that in accordance with the standard practice in the optoelectronic industry, various features may not be drawn to scale. The dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. Reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
-
FIGS. 1A to 1D illustrate a process for forming electrical contacts to a molecular layer according to the present invention; -
FIG. 2 illustrates components in a nanoscale electronic device of the present invention; -
FIG. 3 illustrate, a method for forming an integrated circuit, which may form one environment where a device similar to that shown inFIG. 2 , is included; -
FIG. 4 illustrates the relationship between current density and voltage for devices made according to the present invention having various contact areas; -
FIG. 5 illustrates selected results for: (A and B) reference devices; (C and D) conventionally made devices; or (E) devices of the present invention; and -
FIG. 6 illustrate the reliability of the process of the present invention to produce devices having a certain contact resistance. - The present invention recognizes the advantageous use of using a nanotransfer printing procedure for forming electrical contacts to a molecular layer. The procedure for forming nanoscale patterned thin film metal layers, is disclosed in the above mentioned U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471, incorporated herein by reference. It has been discovered that this procedure as adapted to the present invention allows for the reliable production of nanoscale devices, which in turn may be incorporated into an integrated circuit.
- Referring initially to
FIG. 1A to 1D, illustrated are selected views of the process for forming electrical contacts to a molecular layer. Turning first toFIG. 1A , illustrated is astamp 100 and the coating of asurface 110 of thestamp 100 with ametal layer 120. The process for forming thestamp 100 has been disclosed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471, as incorporated above. Briefly, the process may include forming a pattern on a template, the pattern comprising raised and relief portions. The template is coated with a prepolymer and a catalytic agent, preferably with a mixture of the prepolymer and catalytic agent. The prepolymer is then cured to form an elastomeric rubber. The elastomeric rubber is peeled away from the template to form thestamp 100. At least onesurface 110 of thestamp 100 comprises raisedportions 103, corresponding to relief portions of the template, andrelief portions 107, corresponding to raised portions of the template. In certain embodiments, to facilitate handling, thestamp 100 may be attached to apolymer substrate 130 such as poly(ethylene terephthalate), as disclosed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471. - The coating of the
stamp 100 with themetal layer 120 may be conducted using any conventional process well known to those of ordinary skill in the art. For example, coating may be achieved by treating thesurface 110 of thestamp 100 with a solution containing ions corresponding to themetal layer 120. Alternatively, coating may be accomplished by metal evaporation: evaporating metal vapors onto to thesurface 110 of thestamp 100, using, for example, conventional thermal and electron beam evaporation techniques. In certain preferred embodiments, the coating is performed for a sufficient period to form ametal layer 120 about 200 to about 300Angstroms thickness 125. However, thicker metal layers may be produced according to the present invention, for example, by using a hard material for fabricating thestamp 100. It is also preferable to mount thestamp 100 directly above the source so that the evaporated metal only covers the raised and recessed regions of thestamp 100, and not thesidewalls 109. - Turning to
FIG. 1B illustrated is the formation of an attached layer of anchoredmolecules 140 by coupling first ends of the anchoredmolecules 143 to a conductive orsemiconductive substrate 150, for example by covalent bonding. The coupling may be accomplishing using any conventional process that will result in substantially all sites on thesurface 155 of the conductive orsemiconductive substrate 150 being coupled to the first ends 143 of themolecule 140. For example, coupling may be achieved by placing asurface 155 of the conductive orsemiconductive substrate 150 in contact with a solution containing themolecules 140. In certain embodiments, to facilitate coverage of thesubstrate 150, themolecules 140 may be dissolved in a solvent, such as ethanol or similar organic solvent. - In certain preferred embodiments, coupling is performed by placing the conductive or
semiconductive substrate 150 in achamber 160 and placing asource 165 of themolecules 140 in thechamber 160. One of ordinary skill in the art would understand that before the deposition of themolecules 140, the substrate may undergo surface treatments. It is preferable, for example, for a GaAs substrate to be etched prior to deposition of themolecules 140. Thesource 165, may be for example, a petri dish containing a sufficient amount ofmolecules 140 to ensure substantially complete coverage of the conductive orsemiconductive substrate 150. Thechamber 160 is then maintained at a temperature and pressure sufficient to allowing coupling between the first ends of themolecule 143 and thesubstrate 150. In certain preferred embodiments, for example, thechamber 160 is maintained at room temperature (i.e., about 23° C.), and a pressure of less than about 0.001 Torr for at least about 15 minutes. - Turning to
FIG. 1C illustrated is placing themetal layer 120 in contact with the attached layer of anchoredmolecules 140, themetal layer 120 chemically bonding to free ends of the anchoredmolecules 147. Chemically bonding between the free ends 147 and themetal layer 120 occurs rapidly and without further processing steps. For example, contacting the anchored layer ofmolecules 140 and themetal layer 120 may be done at room temperature (˜23° C.) in room air. Similarly, no additional force need be applied other than the inherent contact between thestamp 100 and thesubstrate 150. - Contact is maintained for a period sufficient to ensure substantially complete chemical bonding of the
metal layer 120 to free ends of the anchoredmolecules 147. In certain preferred embodiments, for example, placing themetal layer 120 in contact with the attached layer of anchoredmolecules 140 occurs for less than about 15 seconds, and more preferably less than about 3 seconds. - After the contact period, the
stamp 100 is peeled away from thesubstrate 150 to yield asubstrate 150 havingmetal layers 170 covalently bonded to the anchoredmolecules 140 in discrete locations corresponding to raisedportions 103 on the stamp 100 (FIG. 1D ). - In other preferred embodiments, the
stamp 100 bearing themetal layer 110 may be placed inchamber 160, and the first ends 143 of themolecules 140 coupled to themetal layer 110. Thestamp 100bearing metal layer 110 andmolecules 140 attached thereto, are then contacted to the conductive orsemiconductive substrate 150. Contact is for a sufficient period to ensure complete chemical bonding of the conductive orsemiconductive substrate 150 to free ends of the anchoredmolecules 147. After the contact period, thestamp 100 is peeled away from thesubstrate 150 to yield asubstrate 150 havingmetal layers 170 covalently bonded to the anchoredmolecules 140 in discrete locations corresponding to raisedportions 103 on thestamp 100, similar to that depicted inFIG. 1D , with the exception that there are substantially noanchored molecules 141 attached to the conductive orsemiconductive substrate 150 that are also not attached to themetal 170. - Another embodiment of the present invention, illustrated in
FIG. 2 , is a nanoscaleelectronic device 200. For clarity, components analogous to that shown toFIGS. 1A to 1D, retain analogous numbering. Thedevice 200 may include a conductive orsemiconductive substrate 250 and a layer of anchoredmolecules 240 having first 243 and second ends 247, the first ends 243 of themolecules 240 being anchored to the conductive orsemiconductive substrate 250. The second ends 247 are able to rotate about the anchored first ends 243. Thedevice 200 further includes a printedmetal layer 270 coupled to the second ends 247 of the layer of anchoredmolecules 240, by covalent bonding, for example. The term printedmetal layer 270 refers to a metal layer covalently associated with the anchored molecules and forming a substantially uniform blanket coverage over the anchoredmolecules 240, at discrete locations on thesubstrate 250, as defined by the raised pattern on thestamp 100, as discussed elsewhere herein. - The anchored
molecules 240 of thedevice 200 may be comprised of one or more compounds characterized by the chemical formula:
F′—(R)n—F″
F′ comprises thefirst end 243 wherein thefirst end 243 comprises a first functional moiety capable of chemically bonding to the conductive orsemiconductive substrate 250. F″ comprises thesecond end 247 wherein thesecond end 247 comprises a second functional moiety capable of chemically bonding to themetal layer 270. R comprises abridge 245 covalently linking the first 243 and second ends 247, whereR 245 comprises individually substituted or unsubstituted nonreactive chemical groups, and 0≦n≦50. - The first functional moieties may comprise any functional groups that would facilitate the formation of covalent bonds between the conductive or
semiconductive substrate 250 and the first ends 243 of themolecule 240. In certain preferred embodiments, for example, the first functional moieties are selected from the group consisting of thiols, monocarboxylates, dicarboxylates and alkoxides. One of ordinary skill in the art would understand that the selection of first functional groups may vary according the chemical composition of thesubstrate 250. For example, if thesubstrate 250 is composed of gallium arsenide, then the first functional moieties preferably comprise thiols, monocarboxylates or dicarboxylates. Alternatively, if thesubstrate 250 is composed of gold, then the first functional moieties preferably comprise thiols. Or, if thesubstrate 250 is composed of silicon, then the first functional moieties preferably comprise alkoxides. - The second functional moieties may comprise any functional groups that would facilitate the formation of covalent bonds between the printed
metal layer 270 and the second ends 247 of themolecule 240. In certain preferred embodiments, for example, the second functional moieties are selected from the group consisting of thiols and disulfides. - As noted (R)n 245, the
bridge 245, may comprise any chemical composition comprising non metal atoms that covalently links the first 243 and second ends 247. In certain embodiments R may comprise nonmetals moieties such as, —C6H4—, —CH2—, —NH—, or —O—, that are repeated n times. These nonmetal moieties may be unsubstituted or substituted. In certain preferred embodiments, for example, R comprises an alkane group having the chemical formula: (—CH2—) or an aromatic having the chemical formula: (—C6H4—), and 1≦n≦25. R comprising an aromatic group, such as a 4,4′ biphenyl group (i.e., R=—C6H4—; n=2), or related compounds, are also within the scope of the present invention. - Various processing considerations may guide the selected of
molecules 240. For example, in certain embodiments, themolecule 240 should be sufficiently volatile that when placed in chamber 160 (FIG. 1C ) the molecule will enter the gas phase in sufficient concentrations to couple to and coat theentire substrate 240 within an acceptable period. In other embodiments, themolecule 240 should be a liquid or sufficiently soluble in a solvent, so as to couple to and coat theentire substrate 250 when the liquid or solution is contacted with thesubstrate 250. - The printed
metal layer 270 may comprise any metal that can covalently couple themolecule 240 and provide an electrical contact between thedevice 200 and other electrical components. In certain preferred embodiments, for example, the printed metal 220 layer is selected from the group consisting of Gold, Silver, Copper, Platinum, Palladium, Tungsten, Aluminum and alloys thereof. - Likewise, the conductive or
semiconductive substrate 250 may comprise any material that can covalently couple to themolecule 240 and provide an electrical contact between thedevice 200 and other electrical components. In certain preferred embodiments, for example, conductive orsemiconductive substrate 250 is selected from the group consisting of Gallium Arsenide, Silicon, Indium Phosphide, Gold, and Tungsten Oxide. One of ordinary skill in the art would understand thatcertain substrates 250, such as Silicon or Gallium Arsenide, may be further contain a conventional dopant introduced using conventional techniques, to increase its conductivity. - As noted above, the printed
metal layer 270 and the conductive orsemiconductive substrate 250 form electrical contacts for thedevice 200. In certain embodiments, for example, the layer of anchoredmolecules 240 forms a one of a channel and a gate dielectric, the conductive orsemiconductive substrate 250 forms the other of a first electrode and a channel, and the printedmetal layer 250 forms a second electrode of a field effect transistor. - Yet another embodiment of the
device 200 of the present invention comprises the conductive orsemiconductive substrate 250 and the layer of anchoredmolecules 240. However, unlike the previously described embodiments, the anchoredmolecules 240 have a reactive end, substantially similar to the above describedfirst end 243, and a nonreactive end, substantially similar to the above-describedbridge 245. Thereactive end 243 is covalently anchored to thesemiconductive substrate 250, while thenonreactive end 245 is able to rotate about thereactive end 243. The device further includes a printedmetal layer 270 laminated to the nonreactive ends 245 of the layer of anchoredmolecules 240, using conventional techniques well known to those skilled in the art, as further discussed in U.S. patent application Ser. Nos. 10/098,202, 10/098,201 and 10/178,471. - In such an embodiment of the
device 200, for example, the anchoredmolecules 240 may comprise one or more compounds characterized by the chemical formula: F′—(R)n. F′ comprises thereactive end 243 where the reactive end, F′ comprises a functional moiety capable of chemically bonding to thesemiconductive substrate 250. Thenon-reactive end 245, R comprises individually substituted or unsubstituted non-reactive chemical groups and 0≦n≦50. - As further illustrated in the experimental section to follow,
devices 200 of the present invention can be efficiently fabricated with fewer defects than previously obtained from conventional devices. For example, thedevice 200 of the present invention may have a contact resistance between the printed metal layer 220 and the conductive orsemiconductive substrate 250 that is at least about 10, more preferably 100, and even more preferably 1000 times higher than a contact resistance for a substantially identical device except having an evaporated metal layer or colloidal metal layer. - Yet another embodiment of the present invention is a method for manufacturing an integrated circuit. The method comprises forming active devices and interconnecting said devices to form an operative integrated circuit. One of ordinary skill in the art would understand that such devices could be assembled to form a variety of components in integrated circuits. Such components may include, for example, field effect transistors (FET), Metal Oxide Semiconductor Field-Effect Transistor MOSFET, Complementary Metal Oxide Semiconductor (CMOS), bipolar transistors, diodes and similar devices, and therefore the details of such assembly steps are not presented here.
-
FIG. 3 illustrates a selected view of a method for formingactive devices 300 in the integrated circuit. Any of the embodiments of process and devices discussed herein may be used to form theactive devices 300, and then interconnecting the devices to form an operative integrated circuit. One of ordinary skill in the art would understand, thatnanoscale devices 200 having a molecular layer 240 (FIG. 2 ) may be incorporated intodevices 300 where thin internal layers of active or passive material would present an advantage. Forming theactive devices 300 includes formingconductive electrodes 385, 390 (e.g., source and drain) on or in asubstrate 395. A conductive orsemiconductive layer 350 is formed over theconductive electrodes substrate 395. A layer ofmolecules 340, acting as a dielectric, is formed by covalently anchoring a layer of themolecules 340 having first and second ends, 343, 347, the first ends 343 of the molecules being anchored to the conductive orsemiconductive substrate 350 and the second ends 347 able to rotate about the anchored first ends 343. Forming the device further includes imprinting anelectrode 370, such as a gate electrode, by contacting astamp 100, such as that shown inFIG. 1A , having a metal layer located thereon with the second ends 347 of the layer ofmolecules 340 to form a bond, for example a covalent bond, between themetal layer 370 and the second ends 347. - As noted elsewhere herein, the present invention allows for the efficient production of integrated circuits with a low number of non functioning nanoscale device components. For example, in certain embodiments, the method results in at least about 99% of
nanoscale devices 200, that may be incorporated into atransistor 300, have a contact resistance between the printedmetal layer 270 and the conductive orsemiconductive substrate 250, comprising GaAs for example, of greater than about 1×105 ohm cm2. In other preferred embodiments, the method results in at least about 99% of the formednanoscale devices 200, have a contact resistance that agree within a factor of about 2 units. - Although the present invention has been described in detail, those skin led in the art should understand that they can make various changes, substitutions and alterations herein without departing from the scope of the invention.
- A first series of experiments was conducted to examine the reliability of using a conventional contact probe to measure the electrical conduction between contacts formed in the nanoscale devices of the present invention. Nanoscale devices having different contact areas were fabricated using the processes described herein. Specifically, the conductive substrate comprised GaAs, the anchored molecules comprised 1,8 octane dithiol and the printed metal layer comprised gold.
- The rubber elastomeric stamp was fabricated as described elsewhere herein and in Loo et al., using a prepolymer comprising polydimethyl siloxane and platinum catalyst (Sylgard 184 Elastomer Kit, Dow-Corning, Midland, Mich.). The stamp was coated with gold (˜10 Angstrom/s) using conventional thermal evaporation using an electron beam, a pure gold target (˜99.9999 wt % purity) and pressure of 10−7 Torr, at room temperature for about 20 to about 30 s.
- To remove the superficial oxide layer GaAs substrates were etched with either concentrated HCl or NH3OH (either at ˜30 wt %) for about 2 min, rinsed with deionized water and dried, prior to forming an attached layer of anchored molecules. To attach the 1,8 octane dithiol molecules, the GaAs substrates were placed in a commercial desiccator, and about 2-3 drops of 1,8 octane dithiol was added to a petri dish located in the desiccator. A vacuum was formed in the desiccator using a house vacuum (˜0.001 Torr) for about 15 minutes.
- The GaAs substrate was then removed from the desiccator rinsed with ethanol and dried over nitrogen gas. After drying, the gold-layered stamp was contacted with the substrate for between about 2 and about 15 seconds. The stamp was then peel off the substrate to yield the nanoscale device. As a routine test to ensure that the gold layer was chemically bonding to free ends of the 1,8 octane dithiol, selected devices were adhered to adhesive tape (Scotch Tape®, 3M Company, St. Paul, Minn.) and the tape was examined for the absence of gold.
-
FIG. 4 illustrates selected results showing the relationship between current density and voltage for devices made according to the present invention having various contact areas. The relationship between current density and voltage was nearly the same for contact areas ranging from about 62.5 microns by 62.5 microns (i.e., 2.5 mil×2.5 mil) to about 500 microns by 500 microns (i.e., 20 mil×20 mil). This indicates that the method for measuring voltage and current across the nanoscale devices was reproducible. - In a second series of experiments, the relationship between current and voltage was examined for a number of nanoscale devices.
FIG. 5 illustrates selected results for: (A and B) reference devices (ref); (C and D) conventionally made devices (prior art); or (E) devices of the present invention. The reference devices comprised gold evaporated onto to GaAs substrates, with no intervening molecular layer. The conventionally made devices comprised substantially identical devices as the present invention except having an evaporated metal layer onto the GaAs substrate with 1,8 octane dithiol anchored thereto. The gold was evaporated onto the substrate using the same thermal evaporation methodology as described in the first experiment for coating the stamp. Evaporation was done at either: (C) room temperature (˜23° C.) or (D) about −15° C. The devices of the present invention were prepared substantial the same as described in the first experiment. -
FIG. 5 shows that the current passing through the conventionally made devices (C & D) was only about one order of magnitude less than the reference devices (A & B). In contrast, substantially less current (i.e., about 3 orders of magnitude) passes through the devices of the present invention (E; traced up and then down) as compared to conventionally made devices (C & D). - Contact resistance was calculated from data such as that illustrated in
FIG. 5 , by determining resistance from the slope of plots of current versus voltage, using data from about −0.1 V to about 0.0 V, and multiplying resistance by the area of the contact (i.e., area of GaAs and gold layer). Representative contact resistances (RA) for the devices depicted inFIG. 5 are summarized in TABLE 1. Standard deviations reported in TABLE 1 are based on the standard deviation of the slope of current versus voltage data, as determined by linear regression analysis.TABLE 1 Device RA (Ohm · cm2) Reference (A) 43.1 ± 5.2 Reference (B) 79.7 ± 8.6 Conventional (C) 140.8 ± 14.9 Conventional (D) 1166 ± 543.8 Present (E) 1.67 × 107 ± 1.06 × 107
As illustrated in TABLE 1, for the conventionally made devices the contact resistance between the evaporated gold layer and the GaAs substrate ranged from about 1.8 to about 27 times higher than the contact resistance of the reference devices. In contrast, the contact resistance of the present invention were at least about five orders of magnitude higher that the contact resistance of the reference device. Moreover, the contact resistance of the present devices were at least about 4 orders of magnitude higher than a contact resistance for the conventionally made devices having an evaporated metal layer. - A third series of experiments was conducted to examine the reliability of the process of the present invention to produce devices having a certain contact resistance. About 100 nanoscale devices were produced in a similar manner as described in the first experiment. A device having a substantial number of shorts is expected to have a contact resistance of less than about 1×103 ohm cm2.
-
FIG. 6 show the result of the experiment. Counts refers the number of devices having a Log10 (RA) value within 0.5 unit ranges depicted horizontal scale inFIG. 6 . All devices tested had a contact resistance between the printed gold layer and the GaAs substrate of greater than about 1×105 ohm cm2. Likewise all of the devices had a contact resistance within a factor of about 2 units.
Claims (10)
1. A nanoscale electronic device, comprising:
a conductive or semiconductive substrate;
a layer of anchored molecules having first and second ends, said first ends of said molecules being covalently anchored to said conductive or semiconductive substrate, said second ends able to rotate about said anchored first ends; and
a printed metal layer covalently coupled to said second ends of said layer of anchored molecules.
2. The device as recited in claim 1 wherein said anchored molecules comprise one or more compounds characterized by the chemical formula:
F′—(R)n—F″
wherein F′ comprises said first end wherein said first end comprises a first functional moiety capable of chemically bonding to said conductive or semiconductive substrate; F″ comprises said second end wherein said second end comprises a second functional moiety capable of chemically bonding to said metal layer; R comprises a bridge covalently linking said first and second ends, where R comprises individually substituted or unsubstituted non-reactive chemical groups and 0≦n≦50.
3. The device as recited in claim 2 wherein said first functional moieties are selected from the group consisting of:
thiols;
monocarboxylates;
dicarboxylates; and
alkoxides.
4. The device as recited in claim 2 wherein said second functional moieties are selected from the group consisting of:
thiols; and
disulfides.
5. The device as recited in claim 2 wherein R comprises an alkane having the chemical formula: (—CH2—)n or an aromatic having the chemical formula: (—C6H4—)n, and 1≦n≦25.
6. The device as recited in claim 1 wherein said device is a diode.
7. The device as recited in claim 1 wherein said conductive or semiconductive substrate is selected from the group consisting of:
Gallium Arsenide;
Silicon;
Indium Phosphide;
Gold;
Tungsten; and
Organic Semiconductors.
8. The device as recited in claim 1 wherein said layer of anchored molecules forms a one of a channel and a gate dielectric, said conductive or semiconductive substrate forms the other of a first electrode and a channel, and said printed metal layer forms a second electrode of a field effect transistor.
9. The device as recited in claim 1 wherein said device has a contact resistance between said printed metal layer and said conductive or semiconductive substrate that is at least about 10 times higher than a contact resistance for a substantially identical device except having an evaporated metal layer.
10. A nanoscale electronic device, comprising:
a conductive or semiconductive substrate;
a layer of anchored molecules having reactive ends and nonreactive ends, said reactive ends of said molecules being covalently anchored to said semiconductive substrate, said nonreactive ends able to rotate about said reactive ends; and
a printed metal layer laminated to said nonreactive ends of said layer of anchored molecules.
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US10/098,201 US6596569B1 (en) | 2002-03-15 | 2002-03-15 | Thin film transistors |
US10/098,202 US6946332B2 (en) | 2002-03-15 | 2002-03-15 | Forming nanoscale patterned thin film metal layers |
US10/178,471 US20030235921A1 (en) | 2002-06-24 | 2002-06-24 | Forming electrical contacts to a molecular layer |
US10/307,642 US7229847B2 (en) | 2002-03-15 | 2002-12-02 | Forming electrical contacts to a molecular layer |
US11/677,403 US20070142619A1 (en) | 2002-03-15 | 2007-02-21 | Forming electrical contacts to a molecular layer |
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US7229847B2 (en) | 2007-06-12 |
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