US20040142536A1 - Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors - Google Patents
Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors Download PDFInfo
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- US20040142536A1 US20040142536A1 US10/755,001 US75500104A US2004142536A1 US 20040142536 A1 US20040142536 A1 US 20040142536A1 US 75500104 A US75500104 A US 75500104A US 2004142536 A1 US2004142536 A1 US 2004142536A1
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- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/60—Electrodes
- H01L28/75—Electrodes comprising two or more layers, e.g. comprising a barrier layer and a metal layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System
- H01L21/28568—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System the conductive layers comprising transition metals
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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
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76855—After-treatment introducing at least one additional element into the layer
- H01L21/76856—After-treatment introducing at least one additional element into the layer by treatment in plasmas or gaseous environments, e.g. nitriding a refractory metal liner
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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
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76861—Post-treatment or after-treatment not introducing additional chemical elements into the layer
- H01L21/76862—Bombardment with particles, e.g. treatment in noble gas plasmas; UV irradiation
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76868—Forming or treating discontinuous thin films, e.g. repair, enhancement or reinforcement of discontinuous thin films
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7687—Thin films associated with contacts of capacitors
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- H01L2221/10—Applying interconnections to be used for carrying current between separate components within a device
- H01L2221/1068—Formation and after-treatment of conductors
- H01L2221/1073—Barrier, adhesion or liner layers
- H01L2221/1078—Multiple stacked thin films not being formed in openings in dielectrics
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- H01L28/40—Capacitors
- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/03—Making the capacitor or connections thereto
Definitions
- the invention pertains to methods of forming materials comprising tungsten and nitrogen, and in an exemplary application pertains to methods of forming capacitors.
- Tungsten nitride has properties which render it particularly-suitable for utilization in integrated circuitry. For instance, tungsten nitride is found to exhibit better or equivalent electrical properties when compared to such commonly utilized compositions as, for example, TiN. Further, tungsten nitride retains its good electrical properties after being subjected to relatively high temperature processing, such as a polysilicon anneal or borophosphosilicate glass (BPSG) reflow.
- relatively high temperature processing such as a polysilicon anneal or borophosphosilicate glass (BPSG) reflow.
- Tungsten nitride materials can be formed by, for example, chemical vapor deposition processes, such as, for example, plasma enhanced chemical vapor deposition (PECVD).
- PECVD plasma enhanced chemical vapor deposition
- the tungsten nitride materials formed by such methods can have good step coverage over an underlying substrate and be continuous, particularly if formed at lower working ends of temperature and plasma power ranges.
- utilization of such tungsten nitride materials has been limited due to difficulties in working with the materials.
- tungsten nitride can peel, and/or bubble, and/or crack when exposed to high temperature processing (such as, for example, the greater than 800° C. processing associated with anneal steps). The peeling, cracking and bubbling lead to a non-continuous film. It would be desirable to develop methods of forming materials comprising tungsten nitride which overcome problems associated with tungsten nitride exposure to high temperature processing conditions.
- the invention includes a method of forming a material comprising tungsten and nitrogen.
- a layer comprising tungsten and nitrogen is deposited over a substrate. Subsequently, and in a separate step from the depositing, the layer comprising tungsten and nitrogen is exposed to a nitrogen-containing plasma.
- the invention includes a method of forming a capacitor.
- a first electrical node is formed and a dielectric layer is formed over the first electrical node.
- a second electrical node is formed and separated from the first electrical node by the dielectric layer.
- a layer comprising tungsten and nitrogen is provided between the dielectric layer and one of the electrical nodes.
- the providing the layer comprising tungsten and nitrogen includes: a) depositing a layer comprising tungsten and nitrogen; and b) in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
- FIG. 1 is a fragmentary, diagrammatic, cross-sectional view of a semiconductor wafer fragment at a preliminary step of a method of the present invention.
- FIG. 2 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent to that of FIG. 1.
- FIG. 3 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent, to that of FIG. 2.
- FIG. 4 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent to that of FIG. 4.
- FIG. 5 is a fragmentary, diagrammatic, cross-sectional view of a semiconductor wafer fragment at a preliminary step of a second embodiment method of the present invention.
- FIG. 6 is a view of the FIG. 5 wafer fragment shown at a processing step subsequent to that of FIG. 5.
- FIG. 7 is a view of the FIG. 5 wafer fragment shown at a 4 processing step subsequent to that of FIG. 6.
- the invention encompasses methods of forming materials comprising tungsten and nitrogen.
- An exemplary method of the present invention is described with reference to a semiconductor wafer fragment 10 in FIGS. 1 and 2.
- wafer fragment 10 comprises a substrate 12 and a layer 14 formed over substrate 12 .
- Substrate 12 includes a step 16 .
- Substrate 12 can comprise, for example, a conductive material, or an insulative material.
- Exemplary conductive materials include, for example, conductively doped polysilicon and metals, such as, for example, copper.
- Conductive materials of substrate 12 can be incorporated into, for example, interconnect lines.
- Exemplary insulative materials include, for example, silicon dioxide, tantalum pentoxide (Ta 2 O 5 ) and barium strontium titanate (BST).
- the insulative material can have a dielectric constant or “K” value which is greater than or equal to about 10.
- K dielectric constant
- Ta 2 O 5 comprises a “K” value of from about 10 to about 25
- BST comprises a “K” value of from about 80 to about 1,000 or greater.
- Layer 14 comprises tungsten and nitrogen, and can, for example, consist essentially of tungsten nitride.
- tungsten nitride can have the chemical formula WN x , wherein “x” is from 0.05 to 0.5.
- layer 14 is a tungsten nitride layer.
- Tungsten nitride layer 14 can be formed by, for example, chemical vapor deposition utilizing WF 6 and N 2 and H 2 as precursors, with either He or Ar as a carrier gas.
- the deposition can be plasma enhanced, with a plasma power of from about 50 watts to about 700 watts.
- a temperature of a substrate upon which deposition occurs can be from about 170° C. to about 550° C., and a pressure within the deposition chamber can be from about 500 mTorr to about 8 Torr.
- the described conditions are for deposition of tungsten nitride over a single semiconductor material wafer.
- Tungsten nitride layer 14 is preferably formed to a thickness of from about 30 ⁇ to about 2000 ⁇ , and more preferably from about 50 ⁇ to about 500 ⁇ .
- An exemplary thickness of layer 14 is from about 150 ⁇ to about 500 ⁇ .
- the shown layer 14 has a number of defects. Specifically, voids (or cracks) 20 occur throughout layer 14 .
- An additional defect is a bubble 22 formed within layer 14 at an interface of layer 14 and substrate 12 . The above-described defects can occur either during deposition of layer 14 , or during high temperature processing subsequent to the deposition.
- layer 14 ′ is exposed to a nitrogen-containing plasma in accordance with a method of the present invention. Such exposure removes at least some of defects 20 and 22 . After the exposure, layer 14 forms a stable film over substrate 12 , with the term “stable” indicating that layer 14 is resistant to formation of cracks, voids or bubbles during subsequent processing.
- the plasma to which layer 14 is exposed preferably comprises a nitrogen-containing compound that does not contain oxygen.
- Suitable compounds are, for example, N 2 and NH 3 .
- Exemplary conditions for treating layer 14 in accordance with the present invention include subjecting layer 14 to a plasma within a reaction chamber at a temperature of from about 170° C. to about 550° C., and a pressure of from about 500 mTorr to about 8 Torr.
- N 2 gas is flowed into the chamber at a rate of from about 50 standard cubic centimeters per minute (sccm) to about 800 sccm, and a plasma is maintained within the chamber at a plasma power of from about 100 watts to about 800 watts.
- One or more of H 2 and Ar can be flowed into the chamber in addition to the N 2 .
- H 2 is flowed, it is preferably flowed at a rate of from about 50 sccm to about 800 sccm, and if Ar is flowed, it is preferably flowed at a rate of from about 200 sccm to about 2,000 sccm.
- An exposure time of a substrate to the plasma of from about 10 seconds to about 80 seconds is found to be generally sufficient to cure defects in a tungsten nitride layer having a thickness of less than or equal to about 2000 ⁇ , and to convert such layer to a stable film.
- the treatment discussed above with reference to FIG. 2 is conducted in a discrete step separate from the step of forming layer 14 that is discussed with reference to FIG. 1.
- the separate step of FIG. 2 can, however, be conducted in the same chamber as the layer-forming step of FIG. 1 by ceasing the forming step while maintaining a plasma utilized for the forming step.
- the layer-forming step can be stopped by ceasing a flow of WF 6 into the reaction chamber. If the nitrogen precursor flow and plasma are maintained within the chamber, the treatment described with reference to FIG. 2 can proceed.
- FIGS. 3 and 4 Another aspect of the invention is described with reference to FIGS. 3 and 4.
- the layer 14 formed above by the processing of FIGS. 1 and 2 is utilized as a substrate for formation of a second layer 30 comprising tungsten and nitrogen.
- Second layer 30 can be formed by identical processing as that described above with reference to FIG. 1.
- Layer 30 can then be treated by processing analogous to that described above with reference to FIG. 2 to eliminate defects and form the construction illustrated in FIG. 4.
- Layers 14 and 30 of FIG. 4 together comprise a mass 32 of tungsten and nitrogen.
- the tungsten and nitrogen of mass 32 can, for example, be in the form of tungsten nitride.
- the invention also encompasses methods wherein a tungsten nitride material is treated with plasma before defects occur.
- the invention encompasses treating a tungsten nitride material that is substantially free of defects with a plasma comprising a nitrogen-containing compound (preferably a nitrogen-containing compound that lacks oxygen).
- a nitrogen-containing compound preferably a nitrogen-containing compound that lacks oxygen.
- wafer fragment 50 comprises a substrate 52 and an insulative layer 54 formed over substrate 52 .
- Insulative layer 54 can comprise, for example, BPSG.
- Substrate 52 can comprise, for example, monocrystalline silicon lightly doped with a p-type background dopant.
- semiconductive substrate is defined to mean any construction comprising semiconductive material, including, but not limited to, bulk semiconductive material such as a semiconductive wafer (either alone or in assemblies comprising other materials thereon), and semiconductive material layers (either alone or in assemblies comprising other materials).
- substrate refers to any a supporting structure, including, but not limited to, the semiconductive substrates described above.
- Node 56 is provided within substrate 52 .
- Node 56 can comprise, for example, a conductively doped diffusion region.
- Such B diffusion region can be formed by implanting a conductivity-enhancing impurity into substrate 52 .
- Opening 58 extends through insulative material layer 54 and to node 56 . Opening 58 can be formed by conventional methods, such as, for example, an etch utilizing CF 4 /CHF 3 and a plasma.
- An electrically conductive material 60 is formed within opening 58 , and a dielectric material 62 is formed over conductive material 60 .
- Conductive material 60 and dielectric material 62 can be formed by conventional methods, such as, for example, chemical vapor deposition and photolithographic processing.
- Conductive material 60 can comprise, for example, a metal-containing layer, such as, titanium nitride or titanium.
- conductive material 60 can comprise conductively doped polysilicon.
- conductive material 60 can comprise tungsten nitride formed in accordance with the methods of the present invention described above.
- Dielectric material 62 can comprise, for example, a dielectric material having a “K” value greater than or equal to 10.
- a layer 64 comprising tungsten and nitrogen is formed over dielectric material 62 .
- Layer 64 can be formed by, for example, the processing described above with reference to FIG. 1, and comprises a number of defects. Generally, it is found to be particularly difficult to form tungsten nitride over dielectric materials having “K” values of greater than 10 utilizing prior art methods.
- layer 64 is exposed to a nitrogen-containing plasma under conditions such as those described above with reference to FIG. 2.
- the exposure to the plasma removes the defects from layer 64 and converts layer 64 to a conformal and stable layer over dielectric material 62 .
- Layers 60 , 62 and 64 now together comprise a capacitor construction 70 , with layers 60 and 64 comprising electrodes of such capacitor construction.
- Capacitor construction 70 can be incorporated as is into integrated circuitry. Alternatively, subsequent processing can be conducted to add a second conductive layer over layer 64 to increase a thickness of the top electrode of capacitor 70 .
- FIG. 7 illustrates wafer fragment 50 after such subsequent processing, and specifically illustrates an additional conductive layer 72 formed over layer 64 .
- Layer 72 can comprise, for example, an additional tungsten nitride layer formed in accordance with the processing described above with reference to FIGS. 3 and 4.
- layer 72 can comprise a conductive material other than tungsten nitride, such as, for example, conductively doped polysilicon, or a metal-containing layer.
- layer 64 can be considered as part of an upper electrode of the capacitor structure, or as being between dielectric layer 62 and an upper electrode consisting of layer 72 .
- capacitor construction 70 is a container-type capacitor.
- the invention encompasses other embodiments (not shown) wherein the capacitor has a shape other than a container-type structure.
- tungsten nitride layer 64 is formed between dielectric layer 62 and an upper conductive electrode 72 .
- layer 64 is formed between dielectric layer 62 and lower electrode 60 , either in addition to, or alternatively to forming layer 64 between dielectric layer 62 and upper electrode 72 .
- tungsten nitride layer 64 can function as a barrier layer to alleviate or prevent diffusion of materials between dielectric layer 62 and conductive layer 72 .
Abstract
In one aspect, the invention includes a method of forming a material comprising tungsten and nitrogen, comprising: a) providing a substrate; b) depositing a layer comprising tungsten and nitrogen over the substrate; and c) in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma. In another aspect, the invention includes a method of forming a capacitor, comprising: a) forming a first electrical node; b) forming a dielectric layer over the first electrical node; c) forming a second electrical node; and d) providing a layer comprising tungsten and nitrogen between the dielectric layer and one of the electrical nodes, the providing comprising; i) depositing a layer comprising tungsten and nitrogen; and ii) in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
Description
- The invention pertains to methods of forming materials comprising tungsten and nitrogen, and in an exemplary application pertains to methods of forming capacitors.
- Tungsten nitride has properties which render it particularly-suitable for utilization in integrated circuitry. For instance, tungsten nitride is found to exhibit better or equivalent electrical properties when compared to such commonly utilized compositions as, for example, TiN. Further, tungsten nitride retains its good electrical properties after being subjected to relatively high temperature processing, such as a polysilicon anneal or borophosphosilicate glass (BPSG) reflow.
- Tungsten nitride materials can be formed by, for example, chemical vapor deposition processes, such as, for example, plasma enhanced chemical vapor deposition (PECVD). The tungsten nitride materials formed by such methods can have good step coverage over an underlying substrate and be continuous, particularly if formed at lower working ends of temperature and plasma power ranges. However, utilization of such tungsten nitride materials has been limited due to difficulties in working with the materials. Specifically, tungsten nitride can peel, and/or bubble, and/or crack when exposed to high temperature processing (such as, for example, the greater than 800° C. processing associated with anneal steps). The peeling, cracking and bubbling lead to a non-continuous film. It would be desirable to develop methods of forming materials comprising tungsten nitride which overcome problems associated with tungsten nitride exposure to high temperature processing conditions.
- In one aspect, the invention includes a method of forming a material comprising tungsten and nitrogen. A layer comprising tungsten and nitrogen is deposited over a substrate. Subsequently, and in a separate step from the depositing, the layer comprising tungsten and nitrogen is exposed to a nitrogen-containing plasma.
- In another aspect, the invention includes a method of forming a capacitor. A first electrical node is formed and a dielectric layer is formed over the first electrical node. A second electrical node is formed and separated from the first electrical node by the dielectric layer. A layer comprising tungsten and nitrogen is provided between the dielectric layer and one of the electrical nodes. The providing the layer comprising tungsten and nitrogen includes: a) depositing a layer comprising tungsten and nitrogen; and b) in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
- Preferred embodiments of the invention are described below with reference to the following accompanying drawings.
- FIG. 1 is a fragmentary, diagrammatic, cross-sectional view of a semiconductor wafer fragment at a preliminary step of a method of the present invention.
- FIG. 2 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent to that of FIG. 1.
- FIG. 3 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent, to that of FIG. 2.
- FIG. 4 is a view of the FIG. 1 wafer fragment shown at a processing step subsequent to that of FIG. 4.
- FIG. 5 is a fragmentary, diagrammatic, cross-sectional view of a semiconductor wafer fragment at a preliminary step of a second embodiment method of the present invention.
- FIG. 6 is a view of the FIG. 5 wafer fragment shown at a processing step subsequent to that of FIG. 5.
- FIG. 7 is a view of the FIG. 5 wafer fragment shown at a4 processing step subsequent to that of FIG. 6.
- This disclosure of the invention is submitted in furtherance of the constitutional purposes of the U.S. Patent Laws “to promote the progress of science and useful arts” (Article 1, Section 8).
- The invention encompasses methods of forming materials comprising tungsten and nitrogen. An exemplary method of the present invention is described with reference to a
semiconductor wafer fragment 10 in FIGS. 1 and 2. Referring to FIG. 1,wafer fragment 10 comprises asubstrate 12 and alayer 14 formed oversubstrate 12.Substrate 12 includes astep 16.Substrate 12 can comprise, for example, a conductive material, or an insulative material. Exemplary conductive materials include, for example, conductively doped polysilicon and metals, such as, for example, copper. Conductive materials ofsubstrate 12 can be incorporated into, for example, interconnect lines. Exemplary insulative materials include, for example, silicon dioxide, tantalum pentoxide (Ta2O5) and barium strontium titanate (BST). The insulative material can have a dielectric constant or “K” value which is greater than or equal to about 10. For instance, Ta2O5 comprises a “K” value of from about 10 to about 25, and BST comprises a “K” value of from about 80 to about 1,000 or greater. -
Layer 14 comprises tungsten and nitrogen, and can, for example, consist essentially of tungsten nitride. Such tungsten nitride can have the chemical formula WNx, wherein “x” is from 0.05 to 0.5. In one aspect,layer 14 is a tungsten nitride layer.Tungsten nitride layer 14 can be formed by, for example, chemical vapor deposition utilizing WF6 and N2 and H2 as precursors, with either He or Ar as a carrier gas. The deposition can be plasma enhanced, with a plasma power of from about 50 watts to about 700 watts. A temperature of a substrate upon which deposition occurs can be from about 170° C. to about 550° C., and a pressure within the deposition chamber can be from about 500 mTorr to about 8 Torr. The described conditions are for deposition of tungsten nitride over a single semiconductor material wafer. -
Tungsten nitride layer 14 is preferably formed to a thickness of from about 30 Å to about 2000 Å, and more preferably from about 50 Å to about 500 Å. An exemplary thickness oflayer 14 is from about 150 Å to about 500 Å. The shownlayer 14 has a number of defects. Specifically, voids (or cracks) 20 occur throughoutlayer 14. An additional defect is abubble 22 formed withinlayer 14 at an interface oflayer 14 andsubstrate 12. The above-described defects can occur either during deposition oflayer 14, or during high temperature processing subsequent to the deposition. - Referring to FIG. 2,
layer 14′ is exposed to a nitrogen-containing plasma in accordance with a method of the present invention. Such exposure removes at least some ofdefects layer 14 forms a stable film oversubstrate 12, with the term “stable” indicating thatlayer 14 is resistant to formation of cracks, voids or bubbles during subsequent processing. - The plasma to which
layer 14 is exposed preferably comprises a nitrogen-containing compound that does not contain oxygen. Suitable compounds are, for example, N2 and NH3. - Exemplary conditions for treating
layer 14 in accordance with the present invention include subjectinglayer 14 to a plasma within a reaction chamber at a temperature of from about 170° C. to about 550° C., and a pressure of from about 500 mTorr to about 8 Torr. N2 gas is flowed into the chamber at a rate of from about 50 standard cubic centimeters per minute (sccm) to about 800 sccm, and a plasma is maintained within the chamber at a plasma power of from about 100 watts to about 800 watts. One or more of H2 and Ar can be flowed into the chamber in addition to the N2. If H2 is flowed, it is preferably flowed at a rate of from about 50 sccm to about 800 sccm, and if Ar is flowed, it is preferably flowed at a rate of from about 200 sccm to about 2,000 sccm. An exposure time of a substrate to the plasma of from about 10 seconds to about 80 seconds is found to be generally sufficient to cure defects in a tungsten nitride layer having a thickness of less than or equal to about 2000 Å, and to convert such layer to a stable film. - The treatment discussed above with reference to FIG. 2 is conducted in a discrete step separate from the step of forming
layer 14 that is discussed with reference to FIG. 1. The separate step of FIG. 2 can, however, be conducted in the same chamber as the layer-forming step of FIG. 1 by ceasing the forming step while maintaining a plasma utilized for the forming step. For instance, in embodiments wherein WF6 and either N2 or NH3 are utilized as precursors in the layer-forming step of FIG. 1, the layer-forming step can be stopped by ceasing a flow of WF6 into the reaction chamber. If the nitrogen precursor flow and plasma are maintained within the chamber, the treatment described with reference to FIG. 2 can proceed. - Another aspect of the invention is described with reference to FIGS. 3 and 4. In this aspect, the
layer 14 formed above by the processing of FIGS. 1 and 2 is utilized as a substrate for formation of asecond layer 30 comprising tungsten and nitrogen.Second layer 30 can be formed by identical processing as that described above with reference to FIG. 1.Layer 30 can then be treated by processing analogous to that described above with reference to FIG. 2 to eliminate defects and form the construction illustrated in FIG. 4. - Layers14 and 30 of FIG. 4 together comprise a
mass 32 of tungsten and nitrogen. The tungsten and nitrogen ofmass 32 can, for example, be in the form of tungsten nitride. - It is noted that although the above-described embodiments illustrate a tungsten nitride material being treated with a plasma after formation of defects in the material, the invention also encompasses methods wherein a tungsten nitride material is treated with plasma before defects occur. For instance, in one aspect the invention encompasses treating a tungsten nitride material that is substantially free of defects with a plasma comprising a nitrogen-containing compound (preferably a nitrogen-containing compound that lacks oxygen). Such treatment can densify the tungsten nitride material to render it less susceptible to prior art problems associated with high temperature processing of tungsten nitride materials.
- Another embodiment of the invention is described with reference to a
semiconductor wafer fragment 50 in FIGS. 5-7. Referring to FIG. 5,wafer fragment 50 comprises asubstrate 52 and aninsulative layer 54 formed oversubstrate 52.Insulative layer 54 can comprise, for example, BPSG.Substrate 52 can comprise, for example, monocrystalline silicon lightly doped with a p-type background dopant. To aid in interpretation of the claims that follow, the term “semiconductive substrate” is defined to mean any construction comprising semiconductive material, including, but not limited to, bulk semiconductive material such as a semiconductive wafer (either alone or in assemblies comprising other materials thereon), and semiconductive material layers (either alone or in assemblies comprising other materials). The term “substrate” refers to any a supporting structure, including, but not limited to, the semiconductive substrates described above. - An
electrical node 56 is provided withinsubstrate 52.Node 56 can comprise, for example, a conductively doped diffusion region. Such B diffusion region can be formed by implanting a conductivity-enhancing impurity intosubstrate 52. - An
opening 58 extends throughinsulative material layer 54 and tonode 56.Opening 58 can be formed by conventional methods, such as, for example, an etch utilizing CF4/CHF3 and a plasma. - An electrically
conductive material 60 is formed withinopening 58, and adielectric material 62 is formed overconductive material 60.Conductive material 60 anddielectric material 62 can be formed by conventional methods, such as, for example, chemical vapor deposition and photolithographic processing.Conductive material 60 can comprise, for example, a metal-containing layer, such as, titanium nitride or titanium. Alternatively,conductive material 60 can comprise conductively doped polysilicon. In yet other alternative embodiments,conductive material 60 can comprise tungsten nitride formed in accordance with the methods of the present invention described above.Dielectric material 62 can comprise, for example, a dielectric material having a “K” value greater than or equal to 10. - A
layer 64 comprising tungsten and nitrogen is formed overdielectric material 62.Layer 64 can be formed by, for example, the processing described above with reference to FIG. 1, and comprises a number of defects. Generally, it is found to be particularly difficult to form tungsten nitride over dielectric materials having “K” values of greater than 10 utilizing prior art methods. - Referring to FIG. 6,
layer 64 is exposed to a nitrogen-containing plasma under conditions such as those described above with reference to FIG. 2. The exposure to the plasma removes the defects fromlayer 64 and convertslayer 64 to a conformal and stable layer overdielectric material 62.Layers capacitor construction 70, withlayers -
Capacitor construction 70 can be incorporated as is into integrated circuitry. Alternatively, subsequent processing can be conducted to add a second conductive layer overlayer 64 to increase a thickness of the top electrode ofcapacitor 70. FIG. 7 illustrateswafer fragment 50 after such subsequent processing, and specifically illustrates an additionalconductive layer 72 formed overlayer 64.Layer 72 can comprise, for example, an additional tungsten nitride layer formed in accordance with the processing described above with reference to FIGS. 3 and 4. Alternatively,layer 72 can comprise a conductive material other than tungsten nitride, such as, for example, conductively doped polysilicon, or a metal-containing layer. In alternative methods of describingcapacitor structure 70 of FIG. 7,layer 64 can be considered as part of an upper electrode of the capacitor structure, or as being betweendielectric layer 62 and an upper electrode consisting oflayer 72. - In the shown embodiment,
capacitor construction 70 is a container-type capacitor. The invention encompasses other embodiments (not shown) wherein the capacitor has a shape other than a container-type structure. - In the shown embodiment,
tungsten nitride layer 64 is formed betweendielectric layer 62 and an upperconductive electrode 72. However, it is to be understood that the invention encompasses other embodiments (not shown) whereinlayer 64 is formed betweendielectric layer 62 andlower electrode 60, either in addition to, or alternatively to forminglayer 64 betweendielectric layer 62 andupper electrode 72. - It is noted that an advantage of providing
tungsten nitride layer 64 betweendielectric layer 62 and a capacitor electrode is thattungsten nitride layer 64 can function as a barrier layer to alleviate or prevent diffusion of materials betweendielectric layer 62 andconductive layer 72. - In compliance with the statute, the invention has been described in language more or less specific as to structural and methodical features. It is to be understood, however, that the invention is not limited to the specific features shown and described, since the means herein disclosed comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted in accordance with the doctrine of equivalents.
Claims (48)
1. A method of forming a material comprising tungsten and nitrogen, comprising:
providing a substrate;
depositing a layer comprising tungsten and nitrogen over the substrate; and
in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
2. The method of claim 1 wherein the substrate comprises a dielectric material having a “K” greater than or equal to 10.
3. The method of claim 2 wherein the dielectric material comprises at least one of Ta2O5 and BST.
4. The method of claim 1 wherein the substrate comprises silicon.
5. The method of claim 1 wherein the substrate comprises silicon dioxide.
6. The method of claim 1 wherein the substrate comprises polysilicon.
7. The method of claim 1 wherein the substrate comprises a metal.
8. The method of claim 1 wherein the substrate comprises copper.
9. The method of claim 1 wherein the depositing comprises plasma-enhanced CVD utilizing WF6 and a nitrogen precursor.
10. The method of claim 9 wherein the nitrogen precursor comprises N2.
11. The method of claim 1 wherein the depositing comprises plasma-enhanced CVD utilizing WF6 and a nitrogen precursor, and wherein the exposing comprises ceasing the flow of WF6.
12. The method of claim 1 wherein the nitrogen-containing plasma is formed from a nitrogen-containing compound that does not comprise oxygen.
13. The method of claim 1 wherein the nitrogen-containing plasma is formed from at least one of N2 and NH3.
14. The method of claim 1 wherein the tungsten and nitrogen are in the form of WNx, wherein x is from 0.05 to 0.5.
15. The method of claim 1 wherein the layer comprising tungsten and nitrogen is a first layer, and further comprising forming a second layer comprising tungsten and nitrogen over said first layer.
16. A method of forming a mass comprising tungsten nitride, comprising:
providing a substrate;
depositing a first layer comprising tungsten nitride over the substrate;
ceasing the depositing of the first layer and exposing the first layer to a first nitrogen-containing plasma;
after exposing the first layer to the first nitrogen-containing plasma, depositing a second layer comprising tungsten nitride;
ceasing the depositing of the second layer; and
exposing the second layer to a second nitrogen-containing plasma.
17. The method of claim 16 wherein the first layer comprises a first thickness of from about 30 Å to about 2000 Å, and wherein the second layer comprises a second thickness of from about 30 Å to about 2000 Å.
18. The method of claim 16 wherein the first layer comprises a first thickness of from about 50 Å to about 500 Å, and wherein the 3 second layer comprises a second thickness of from about 50 Å to about 500 Å.
19. The method of claim 16 wherein the depositing the first layer comprises the same conditions as the depositing the second layer.
20. The method of claim 16 wherein the exposing the first layer comprises the same conditions as the exposing the second layer.
21. The method of claim 16 wherein the substrate comprises a dielectric material having a “K” greater than or equal to 10.
22. The method of claim 21 wherein the dielectric material comprises at least one of Ta2O5 and BST.
23. The method of claim 21 wherein the substrate comprises silicon.
24. The method of claim 21 wherein the substrate comprises silicon dioxide.
25. The method of claim 21 wherein the substrate comprises polysilicon.
26. The method of claim 21 wherein the substrate comprises a metal.
27. The method of claim 21 wherein the substrate comprises copper.
28. The method of claim 21 wherein the first and second depositings comprise plasma-enhanced CVD utilizing WF6 and a nitrogen precursor.
29. The method of claim 28 wherein the nitrogen precursor comprises N2.
30. The method of claim 16 wherein the first and second depositings comprise plasma-enhanced CVD utilizing WF6 and a nitrogen precursor, and wherein the first and second exposings comprise ceasing the flow of WF6.
31. The method of claim 16 wherein the first and second nitrogen-containing plasmas are formed from a nitrogen-containing compound that does not comprise oxygen.
32. The method of claim 16 wherein the first and second nitrogen-containing plasmas are formed from at least one of N2 and NH3.
33. A method of forming a capacitor, comprising:
forming a first electrical node;
forming a dielectric layer over the first electrical node;
forming a second electrical node separated from the first electrical node by the dielectric layer; and
at least one of the first and second electrical nodes comprising tungsten and nitrogen, the forming said at least one of the nodes comprising;
depositing a layer comprising tungsten and nitrogen; and
in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
34. The method of claim 33 wherein the depositing comprises plasma-enhanced CVD utilizing WF6 and a nitrogen precursor, and wherein the exposing comprises ceasing the flow of WF6.
35. The method of claim 33 wherein the nitrogen-containing plasma is formed from a nitrogen-containing compound that does not comprise oxygen.
36. The method of claim 33 wherein the nitrogen-containing plasma is formed from at least one of N2 and NH3.
37. A method of forming a capacitor, comprising:
forming a first electrical node;
forming a dielectric layer over the first electrical node;
forming a second electrical node separated from the first electrical node by the dielectric layer; and
providing a material comprising tungsten and nitrogen between the dielectric layer and at least one of the electrical nodes, the providing comprising;
depositing a layer comprising tungsten and nitrogen; and
in a separate step from the depositing, exposing the layer comprising tungsten and nitrogen to a nitrogen-containing plasma.
38. The method of claim 37 wherein the material comprising tungsten and nitrogen is formed between the dielectric layer and only one of the electrical nodes.
39. The method of claim 37 wherein the material comprising tungsten and nitrogen is formed between the dielectric layer and both of the electrical nodes.
40. The method of claim 37 wherein the dielectric layer comprises a dielectric material having a “K” greater than or equal to 10.
41. The method of claim 40 wherein the dielectric material comprises at least one of Ta2O5 and BST.
42. The method of claim 37 wherein the depositing comprises plasma-enhanced CVD utilizing WF6 and a nitrogen precursor.
43. The method of claim 42 wherein the nitrogen precursor comprises N2.
44. The method of claim 37 wherein the depositing comprises plasma-enhanced CVD utilizing WF6 and a nitrogen precursor, and wherein the exposing comprises ceasing the flow of WF6.
45. The method of claim 37 wherein the nitrogen-containing is plasma is formed from a nitrogen-containing compound that does not comprise oxygen.
46. The method of claim 37 wherein the nitrogen-containing plasma is formed from at least one of N2 and NH5.
47. The method of claim 37 wherein the tungsten and nitrogen are in the form of WNx, wherein x is from 0.05 to 0.5.
48. The method of claim 37 wherein the layer comprising tungsten and nitrogen is a first layer, and further comprising forming a second layer comprising tungsten and nitrogen over said first layer.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/755,001 US20040142536A1 (en) | 1999-02-16 | 2004-01-09 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
US11/452,816 US20060234465A1 (en) | 1999-02-16 | 2006-06-13 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US09/250,974 US6342417B2 (en) | 1999-02-16 | 1999-02-16 | Methods of forming materials comprising tungsten and nitrogen |
US10/035,390 US6682972B2 (en) | 1999-02-16 | 2001-12-28 | Methods of forming materials comprising tungsten and nitrogen |
US10/755,001 US20040142536A1 (en) | 1999-02-16 | 2004-01-09 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
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US10/035,390 Continuation US6682972B2 (en) | 1999-02-16 | 2001-12-28 | Methods of forming materials comprising tungsten and nitrogen |
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US11/452,816 Division US20060234465A1 (en) | 1999-02-16 | 2006-06-13 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
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US20040142536A1 true US20040142536A1 (en) | 2004-07-22 |
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US09/250,974 Expired - Lifetime US6342417B2 (en) | 1999-02-16 | 1999-02-16 | Methods of forming materials comprising tungsten and nitrogen |
US09/751,075 Expired - Lifetime US6395614B2 (en) | 1999-02-16 | 2000-12-29 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
US10/035,390 Expired - Fee Related US6682972B2 (en) | 1999-02-16 | 2001-12-28 | Methods of forming materials comprising tungsten and nitrogen |
US10/755,001 Abandoned US20040142536A1 (en) | 1999-02-16 | 2004-01-09 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
US11/452,816 Abandoned US20060234465A1 (en) | 1999-02-16 | 2006-06-13 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
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US09/751,075 Expired - Lifetime US6395614B2 (en) | 1999-02-16 | 2000-12-29 | Methods of forming materials comprising tungsten and nitrogen, and methods of forming capacitors |
US10/035,390 Expired - Fee Related US6682972B2 (en) | 1999-02-16 | 2001-12-28 | Methods of forming materials comprising tungsten and nitrogen |
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US6342417B2 (en) * | 1999-02-16 | 2002-01-29 | Micron Technology, Inc. | Methods of forming materials comprising tungsten and nitrogen |
KR100773280B1 (en) * | 1999-02-17 | 2007-11-05 | 가부시키가이샤 알박 | Barrier film and method of manufacturing the same |
US7279407B2 (en) | 2004-09-02 | 2007-10-09 | Micron Technology, Inc. | Selective nickel plating of aluminum, copper, and tungsten structures |
KR20060112117A (en) * | 2005-04-26 | 2006-10-31 | 주식회사 하이닉스반도체 | Fuse structure of semiconductor device and method for fabricating the same |
KR100596486B1 (en) * | 2005-05-23 | 2006-07-04 | 삼성전자주식회사 | Stacked semiconductor device and method of manufacturing the same |
FR2888355A1 (en) * | 2005-07-07 | 2007-01-12 | Thomson Licensing Sa | METHOD FOR CONTROLLING CONSUMER RIGHTS OF THE "N AUTHORIZED CONSUMPTION" TYPE OF AUDIO AND / OR VIDEO DIGITAL CONTENT AND DEVICE USING THE SAME |
KR20210057821A (en) * | 2018-10-10 | 2021-05-21 | 램 리써치 코포레이션 | Continuous plasma for film deposition and surface treatment |
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Also Published As
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US6395614B2 (en) | 2002-05-28 |
US20010002317A1 (en) | 2001-05-31 |
US6682972B2 (en) | 2004-01-27 |
US20010041403A1 (en) | 2001-11-15 |
US20060234465A1 (en) | 2006-10-19 |
US20020058377A1 (en) | 2002-05-16 |
US6342417B2 (en) | 2002-01-29 |
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