WO2009014894A1 - Method and apparatus for cleaning a substrate surface - Google Patents
Method and apparatus for cleaning a substrate surface Download PDFInfo
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- WO2009014894A1 WO2009014894A1 PCT/US2008/069430 US2008069430W WO2009014894A1 WO 2009014894 A1 WO2009014894 A1 WO 2009014894A1 US 2008069430 W US2008069430 W US 2008069430W WO 2009014894 A1 WO2009014894 A1 WO 2009014894A1
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/08—Reaction chambers; Selection of materials therefor
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02046—Dry cleaning only
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
- H01L21/02233—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer
- H01L21/02236—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor
- H01L21/02238—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor silicon in uncombined form, i.e. pure silicon
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02255—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by thermal treatment
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/3165—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation
- H01L21/31654—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself
- H01L21/31658—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe
- H01L21/31662—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe of silicon in uncombined form
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02532—Silicon, silicon germanium, germanium
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02658—Pretreatments
- H01L21/02661—In-situ cleaning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/976—Temporary protective layer
Definitions
- Embodiments of the present invention generally relate to method and apparatus for processing a semiconductor substrate. More particularly, embodiments of the present invention relate to method and apparatus for cleaning a surface of a silicon substrate.
- Integrated circuits are formed in and on silicon and other semiconductor substrates.
- substrates are made by growing an ingot from a bath of molten silicon, and then sawing the solidified ingot into multiple wafers.
- An epitaxial silicon layer may then be formed on the monocrystalline silicon wafer to form a defect free silicon layer that may be doped or undoped.
- Semiconductor devices, such as transistors, are manufactured from the epitaxial silicon layer. The electrical properties of the formed epitaxial silicon layer will generally be better than the properties of the monocrystalline silicon substrate.
- the present invention generally provides an apparatus for processing a substrate, comprising a low energy cleaning chamber comprising one or more walls that form a processing region, a plasma generating source that is adapted to deliver electromagnetic energy to the processing region, a first gas source that is adapted to deliver a silicon containing gas to the processing region, a second gas source that is adapted to deliver a oxidizing gas to the processing region, an epitaxial layer deposition chamber, and a transfer chamber having one or more walls that enclose a transfer region and a robot that is adapted to transfer substrates between a first position within the low energy cleaning chamber and a first position with the epitaxial layer deposition chamber.
- Embodiment of the invention further provide an apparatus for performing a low energy cleaning process comprising one or more walls that form a processing region, a plasma generating source that is adapted to deliver electromagnetic energy to the processing region, a shield that is positioned within the processing region, wherein a material that the shield is made of is selected from a group consisting of silicon, yttrium, yttrium oxide, germanium, boron, phosphorous, and silicon germanium compounds, a substrate support having a substrate supporting surface and a biasing electrode that is adapted to be biased by a RF power supply, a first gas source that is adapted to deliver a oxidizing gas to the processing region, a second gas source that is adapted to deliver a inert gas to the processing region, and a third gas source that is adapted to deliver a silicon containing gas to the processing region.
- a material that the shield is made of is selected from a group consisting of silicon, yttrium, yttrium oxide, germanium, boron
- Embodiment of the invention further provide a method of forming an epitaxial layer, comprising depositing a gettering layer on a surface of a chamber component positioned in a processing region of a cleaning chamber, positioning a substrate on a substrate support that is positioned within the processing region of the cleaning chamber, oxidizing a surface of the substrate positioned on the substrate support, removing at least a portion of the oxidized surface of the substrate positioned on the substrate support, passivating the surface of the substrate after removing at least a portion of the oxidized surface by exposing the surface to a hydrogen containing gas, transferring the substrate from the cleaning chamber to an epitaxial layer deposition chamber, and depositing an epitaxial layer on at least a portion of the passivated surface.
- Embodiment of the invention further provide an apparatus for performing a low energy cleaning process comprising one or more walls that form a processing region, wherein at least one of the one or more walls contains a heat exchanging device to control the temperature of the at least one of the one or more walls, a plasma generating source that is adapted to deliver electromagnetic energy to the processing region, a shield that is positioned within the processing region, a substrate support having a substrate supporting surface, a biasing electrode that is adapted to be biased by a RF power supply, and a substrate support heat exchanging device to control the temperature of the substrate supporting surface, a first gas source that is adapted to deliver a oxidizing gas to the processing region, and a second gas source that is adapted to deliver an etching gas to the processing region.
- a heat exchanging device to control the temperature of the at least one of the one or more walls
- a plasma generating source that is adapted to deliver electromagnetic energy to the processing region
- a shield that is positioned within the processing region
- a substrate support having
- Figure 1 schematically illustrates a sectional side view of a cleaning chamber in accordance with one embodiment of the present invention.
- Figure 2A schematically illustrates a sectional side view of a cleaning chamber in accordance with another embodiment of the present invention.
- Figure 2B schematically illustrates a sectional side view of a cleaning chamber in accordance with one embodiment of the present invention.
- Figure 3 illustrates a flow chart of a method for cleaning a semiconductor substrate in accordance with one embodiment of the present invention.
- Figure 4 schematically illustrates a partial sectional side view of a cleaning chamber.
- Figure 5 schematically illustrates a plan view of a cluster tool in accordance with one embodiment of the present invention.
- the present invention generally provides apparatus and method for forming a clean and damage free surface on a semiconductor substrate (or wafer).
- One embodiment of the present invention provides a system that contains a cleaning chamber that is adapted to expose a surface of substrate to a plasma cleaning process prior to forming an epitaxial layer thereon.
- a method is employed to reduce the contamination of a substrate processed in the cleaning chamber by depositing a gettering material on the inner surfaces of the cleaning chamber prior to performing a cleaning process on a substrate. The gettering material will tend to trap contaminants found in the cleaning chamber, thus insuring that the processed substrate is clean, and future substrates processed in the chamber will have the same desirable cleaning results.
- oxidation and etching steps are repeatedly performed on a substrate in the cleaning chamber to expose or create a clean surface on a substrate that can then have an epitaxial film placed thereon.
- a low energy plasma is used during the etching step. The low energy of the plasma may be achieved by lowering the substrate RF bias power, adjusting bias potential applied across the substrate, pulsing the RF power used to generate a plasma in the processing chamber, pulsing substrate RF bias power, forming a plasma that contains light atomic species, using a plasma shield to confine the plasma, adjusting processing position of the substrate relative to the plasma, and/or a combination thereof.
- FIG. 1 schematically illustrates a cross-sectional side view of a cleaning chamber 100 in accordance with one embodiment of the present invention.
- the cleaning chamber 100 is an inductively coupled plasma processing chamber that is able to clean a substrate 102, in a processing region 122.
- the cleaning chamber 100 is a modified Decoupled Plasma Nitridation (DPN) Chamber that is available from Applied Materials of Santa Clara, which uses an inductively coupled radio frequency (RF) source.
- RF radio frequency
- the cleaning chamber 100 generally comprises an RF source assembly 191 , a process chamber assembly 193, and a substrate support assembly 194.
- the process chamber assembly 193 generally comprises multiple components that are used to form a vacuum in the processing region 122 so that a plasma process can be performed therein.
- the process chamber assembly 193 comprises a chamber base 127, chamber walls 128 and a chamber lid 129 that sealably enclose the processing region 122.
- the processing region 122 can be evacuated to a desired vacuum pressure by the use of a vacuum pump 110 that is connected to the processing region 122 through the chamber base 127 and/or chamber walls 128.
- the chamber walls 128 and chamber base 127 may be formed from a metal, such as aluminum, or other suitable material.
- the chamber walls 128 and chamber lid 129 may be temperature controlled. Conventional methods and/or heat exchanging devices may be used to heat and cool various chamber components. For example, the chamber walls 128 and chamber lid 129 may be heated by heaters (not shown), such as lamp arrays, positioned outside the process chamber assembly 193. In another example, cooling gases may be circulated out side the process chamber assembly 193 to cool the chamber walls 128 and chamber lid 129. In another example, heating and/or cooling conduits, which may be embedded in the chamber walls 128 and chamber lid 129, may be connected to a fluid heater/chiller device to control the temperature. A method and apparatus that may be used to control the temperature of the process chamber assembly 193 may be found in the United States Patent No. 6,083,323, entitled "Method for Controlling the Temperature of the Walls of a Reaction Chamber During Processing," which is incorporated herein by reference.
- the RF source assembly 191 is an inductive type RF source that generally contains an RF generator 108 and an RF match circuit 108A that are connected to a coil 109.
- the coil 109 is positioned adjacent to the chamber lid 129.
- the RF generator 108 may operate at between about 0 and about 3000 W at a frequency between about 400 kHz and about 60 MHz. In one example, the RF generator 108 operates at a frequency of 13.56 MHz.
- the RF generator 108 may provide pulses of RF energy to the coil 109 to generate a plasma that has a reduced energy level and/or plasma density.
- the chamber lid 129 is generally a dielectric component (e.g., quartz, ceramic material (e.g., alumina)) that is adapted to allow the RF energy delivered from the inductive RF source assembly 191 to form a plasma in the processing region 122.
- a dielectric component e.g., quartz, ceramic material (e.g., alumina)
- the process chamber assembly 193 also contains a gas delivery system 150 that is adapted to deliver one or more process gasses into the processing region 122, which is defined by the chamber base 127, the chamber walls 128 and the chamber lid 129.
- the processing region 122 is circumscribed with one or more shields 130 that are intended to protect the chamber walls 128 and/or the chamber lid 129 from the generated plasma and preparation processes performed in the chamber.
- the gas delivery system 150 comprises an ozonator configured to generate a stream of gas containing high concentration ozone (O 3 ).
- the gas delivery system is adapted to deliver a reactive gas, such as a silicon containing gas (e.g., silane), a hydrogen containing gas (e.g., H 2 ), a germanium containing gas, a chlorine containing gas, an oxygen containing gas (e.g., O 2 ), nitrogen trifluoride (NF 3 ), a boron containing gas (e.g., diborane), and/or a phosphorous containing gas (e.g., phosphine) to name just a few.
- the gas delivery system is adapted to deliver an inert gas, such as argon (Ar), helium (He), krypton (Kr) and/or nitrogen (N 2 ).
- the pressure in the processing region 122 can be controlled by adjusting the flow rate of gas delivered by the gas delivery system 150 and the pumping speed of the vacuum pump 110.
- a throttle valve 111 may be used to adjust the pumping speed of the vacuum pump 110.
- the substrate support assembly 194 generally includes a substrate support 162 that contains a substrate supporting member 162A.
- the substrate supporting member 162A may be a conventional electrostatic chuck that can be used to actively hold the substrate during processing, or comprise a simple substrate support.
- a temperature controller 161 is generally adapted heat and/or cool the substrate supporting member 162A to a desired temperature by use of temperature controller 161 and a heat exchanging device, such embedded resistive heating elements or fluid cooling channels that are coupled to a conventional heat exchanger (not shown).
- the temperature controller 161 is adapted to operate and heat a substrate 102 positioned on the substrate supporting member 162A to a temperature between about 20°C and about 800°C.
- the substrate support 162 may be connected to a RF generator 123 so that an RF bias can be applied to a conductive element disposed within a portion of the substrate support 162 to pull the ions present in the plasma formed in the processing region 122 to a surface of the substrate 102.
- the RF generator 123 is adapted to generate a cathodic or anodic bias on the substrate during one or more portions of the substrate cleaning process to adjust the retained charge on the substrate and/or control the amount of ion and plasma bombardment of the substrate surface.
- the substrate supporting member 162A is grounded, or DC (direct current) biased.
- the substrate supporting member 162A and substrate are electrically floating during the plasma process in order to minimize ion bombardment damage of substrate 102.
- delivering RF energy from the RF generator 108 to the processing region 122 causes the gas atoms in the processing region 122 to become ionized.
- contamination on the surface of the substrate 102 may be knocked off or desorbed from the surface due to the energy transferred by the ionized atoms in the plasma striking the surface of the substrate 102.
- the ionized gas atoms in the plasma may be attracted to surface of the substrate 102 due to a bias applied to the substrate 102 via the substrate supporting member 162A.
- the RF power delivered to the coil 109 by the RF generator 108 is pulsed to form a low energy plasma.
- a pulsed plasma process is generally a series of sequential energy pulses delivered to the processing region 122 as a function of time by use of the coil 109 by the RF generator 108. Pulsing an inductive RF source to excite a plasma formed in the processing region 122 will minimize the amount of damage caused to the surface of the substrate due to the plasma potentials commonly formed in conventional plasma processing chambers. The need to minimize or eliminate any damage caused to the substrate surface by the cleaning process is critical for single crystal substrates that are being prepared for the formation of an epitaxial layer thereon.
- pulsing the inductive RF source power allows one to create and sustain a low electron temperature, and a low ion energy plasma.
- the ions generated by a pulsed RF inductive plasma which produces ions with low ion energies (e.g., ⁇ 10 eV) that will not damage a substrate positioned within the plasma.
- An example of a method of pulsing RF power that can be adapted to benefit one or more of the embodiments described herein is further discussed in the commonly assigned US Patent 6,831 ,021 , filed June 12, 2003, which is incorporated herein by reference.
- FIG. 2A schematically illustrates a cross-sectional side view of a cleaning chamber 100a in accordance with another embodiment of the present invention.
- the cleaning chamber 100a is a capacitively coupled plasma chamber.
- the cleaning chamber 100a comprises a chamber lid 129 sealably coupled to the process chamber assembly 196 and defining a process region 133.
- the chamber lid assembly 130 comprises a gas distribution plate (also known as a shower head) 132 and a base plate 131 having a blocker plate 134 substantially parallel to the gas distribution plate 132.
- the gas distribution plate 132 is isolated from the chamber walls 128 using an electric insulator 135.
- the chamber lid assembly 130 is connected to the gas delivery assembly 150.
- Reactant and/or cleaning gases from the gas delivery system 150 may be flown to the process region 133 through a gas passage 136.
- the RF source assembly 191 is coupled to the base plate 131 providing RF power source for plasma generation.
- a RF source for capacitive plasma generation generally comprises a radio frequency (RF) power source, for example, a 13.56 MHz RF generator.
- RF radio frequency
- the substrate supporting member 162A may be grounded.
- the bias potential between the substrate supporting member 162A and the base plate 131 may ignite a plasma in the process region 133. Activated species in the plasma can be used to process the substrate 102.
- the substrate support 162A may be connected to a RF generator 123 so that an RF bias can be applied to a conductive element disposed in portions of the substrate support member 162A to pull the ions present in the plasma that has been generated in the processing region 122 to a surface of the substrate 102.
- a capacitively coupled plasma reactor may be found in United States Patent No. 6,495,233, entitled "Apparatus for distributing gases in a chemical vapor deposition system," which is incorporated by reference herein.
- the cleaning chambers 100 and 100a ( Figures 1 and 2) described above may be used to clean a semiconductor substrate. Particularly, the cleaning chambers 100 and 100a of the present invention may be used to perform a damage free cleaning to a silicon surface.
- a cleaning chamber may use microwave energy source (not shown) to generate a plasma that is used to perform the cleaning process discussed herein.
- Figure 3 illustrates a flow chart of a method 200 for cleaning a semiconductor substrate in accordance with one embodiment of the present invention.
- the method 200 may be performed in the cleaning chambers 100 or 100a described above.
- the cleaning process generally provides a method for forming a clean and damage free surface on a semiconductor substrate by use of plasma cleaning process.
- step 212 inner surfaces of a cleaning chamber, such as the cleaning chamber 100 or cleaning chamber 100a, may be regenerated.
- step 212 comprises running an etching process to remove any unwanted residual material and/or contamination found on various inner surfaces of the cleaning chamber.
- Conventional sputter etching and/or chemically assisted etching processes may be performed to regenerate the inner surfaces of the cleaning chamber, such as the chamber walls or shields 130.
- remote or in-situ plasma of a reactive gas may be used to remove contaminations on the inner surface of the cleaning chamber.
- the reactive gas may be selected from a wide range of gases, including the commonly used halogens and halogen compounds.
- the reactive gas may be chlorine, fluorine or compounds thereof, such as nitrogen trifluoride (NF 3 ), carbon tetrafluoride (CF 4 ), sulfur hexafluoride (SF 6 ), hexafluoroethane (C 2 F 6 ), carbon tetrachloride (CCI 4 ), hexachloroethane (C 2 CI 6 ), or combination thereof depending on the deposited material to be removed.
- a carrier gas such as argon, nitrogen, helium, hydrogen or oxygen, etc, may be delivered to the processing region of the cleaning chamber to aid the removal of the unwanted species and/or to assist in the etching process, or help initiating and/or stabilizing the plasma in the cleaning chamber.
- a cleaning gas may be delivered into the cleaning chamber to etch a coating comprising a gettering material (discussed below), such as silicon (Si) on the inner surface of the cleaning chamber.
- the cleaning gas may comprise heated nitrogen trifluoride (NF 3 ), hydrogen chloride (HCI), or the combination thereof.
- a conventional remote plasma source may be coupled to the processing region of the process chamber.
- RPS generally provides a reactive cleaning agent, such as disassociated fluorine, that removes deposition and other process byproducts from the chamber components, which is evacuated by the vacuum pump 110.
- a shutter disk or a dummy substrate may be used to cover a top surface of a substrate support member, such as the substrate supporting member 162A of Figures 1 and 2A.
- the shutter disk or dummy substrate is used to prevent any deposition on the substrate support member during the subsequent deposition, such as step 216, so that a substrate being processed will not be in contact with any coatings formed inside the cleaning chamber. Covering the substrate support member may also avoid chucking problems when the substrate support member is an electrostatic chuck configured to hold the substrate during processing.
- one or more of the cleaning chamber components may be conditioned by depositing a gettering coating thereon.
- the gettering coating may comprise one or more gettering materials.
- gettering materials generally refers to any material that used to immobilize and/or adsorb (i.e., physiosorb, or chemisorb) any impurities found in the cleaning chamber prior to or during the cleaning process. Gettering materials are chosen to remove unwanted byproducts in the cleaning chamber while presenting no other complications, such as generation of new byproducts, generating particles, the unwanted dissipation of RF power, or removal of desired species found in the processing region 122.
- the thickness of the deposited gettering coating formed during step 216 may be between about 10A to about 1 ⁇ m.
- the coating on the inner surfaces may be used to reduce or prevent contamination of subsequently processed substrates.
- the coating may comprise a pure silicon material ⁇ e.g., epitaxial Si layer, polycrystalline Si layer, amorphous Si layer), a silicon containing layer, a germanium containing layer, and/or a silicon or germanium layer that contains a desired level of one or more common dopant materials (e.g., boron (B), phosphorus (P)), or the combinations thereof. It is believed that coatings that are formed from pure silicon will have a strong gettering affect for most contamination commonly found on silicon substrates that are about to have an epitaxial layer formed thereon.
- the gettering coating is deposited using a silane (SiH 4 ) containing gas that is delivered into the processing region of the processing chamber to a pressure of about 0.1 to about 5.0 Torr and an RF power between about 200 watts and about 2kW, while the chamber component temperatures are maintained in a range between about 200 °C and about 500 0 C.
- SiH 4 silane
- a layer of a gettering material that is configured to getter oxygen may be deposited on the inner surfaces of the cleaning chamber.
- the coating comprises a silicon (Si) layer of a thickness between about 10 A to about 1 ⁇ m.
- the silicon coating may be deposited by use of a typical CVD or ALD type processes that deliver a silicon containing precursor to heated components that are positioned in the processing region of the chamber.
- the components that are to receive the gettering material may be heated by use of external lamps, embedded resistive heating elements, and/or are heated by use of the RF plasma.
- the coating of gettering material deposited in step 216 is capable of immobilizing, absorbing or adsorbing undesired species created during the cleaning process. Eventually, the gettering capability of the coating will be reduced as the active surfaces are covered or become less reactive. To compensate for this problem a fresh coating of gettering material may be formed on the components in the processing region 122 by repeating steps 212, 214, 216. In one embodiment, steps 212, 214, 216 may be repeated prior to processing each substrate in the cleaning chamber. In another embodiment, steps 212, 214, 216 may be repeated after processing multiple substrates in the cleaning chamber.
- the shutter disk, dummy disk, or dummy substrate is removed from the cleaning chamber.
- a substrate that is to be cleaned is disposed in the cleaning chamber. Since the cleaning chamber is generally kept in a vacuum state, contaminations and particles found on the substrate surface, such as oxygen, carbon, fluorine, silicon, and chlorine, may desorb or be moved so that they can be gettered by the coating formed on the inner surface of the cleaning chamber.
- the substrate is then cleaned by performing one or more oxidation and etching steps which are discussed below.
- the oxidation process is used to consume contaminated or damaged silicon found on the surface of the substrate.
- the formed oxidized layer is then removed to expose a fresh and clean silicon surface.
- the oxidation process is described in step 220, and the etching step is described in step 222.
- an oxidizing agent is delivered to the cleaning chamber to generate oxide on a top layer of the substrate being cleaned.
- the oxidizing agent comprises ozone (O 3 ), which enables oxidation of silicon at a relatively low temperature.
- ozone may be generated in an ozonator from exposing oxygen to plasma, ultra violent (UV) energy, or the combination of plasma and UV energy.
- UV lamps 145 are positioned to deliver energy to the surface of the substrate during processing. In one embodiment (not shown), the UV lamps are positioned so that it can deliver UV light through a port formed in one of the chamber walls 128. Detailed description of method for oxidation may be found in United States Patent Application Publication No.
- the substrate surface is oxidized using a high temperature oxidation process.
- the substrate may be heated on a substrate support member, such as the substrate supporting member 162A of Figure 1 , to a temperature between about 400°C to about 700 0 C.
- the cleaning chamber is maintained at a lower temperature than the substrate.
- the cleaning chamber components e.g., walls, shields
- the substrate support member/heater is maintained at about 700°C
- the cleaning chamber is maintained at about 350 0 C.
- the walls are temperature controlled using fluid flowing through channels formed in the walls of the processing chamber.
- step 222 an etching process is then performed to remove the oxide formed in step 220.
- the etching process may be achieved by the use of physical, chemical, or a combination of physical and chemical etching techniques.
- an etching gas may be delivered into the cleaning chamber and a plasma may be ignited to generate reactive species that chemically reacts with the material on the substrate. Volatile byproducts of the reaction are removed by a vacuum system connected to the cleaning chamber and/or gettered by the coating formed on the surface of the chamber components in step 216.
- the etching gas may comprise chlorine, fluorine or other compounds that are suitable for the removal of the oxides formed on the substrate surface during step 220.
- the etching gas comprises nitrogen trifluoride (NF 3 ), chlorine ion (Cl " ), and a carrier gas, such as argon.
- a physical etching is performed by generating a plasma that provides energetic species that are used to bombard the substrate surface to physically remove the material from the substrate surface.
- a bias to the substrate support to accelerate ions formed in the plasma towards the substrate surface.
- the bombarding ions physically remove material on the substrate surface by a sputter-etching action.
- Low energy physical bombardment of the substrate surface is generally desirable to reduce the amount damage to the silicon lattice at the substrate surface.
- a low power bias may be used to remove the oxidized layer and minimize the damage to the surface of the substrate.
- Conventional dry etching processes are generally used to rapidly remove material without need to be concerned about the substrate material lattice damage created by plasma assisted material removal process.
- the etching process of the present invention comprises adjusting the energy of the ions formed during the etching process to minimize the damage to the crystalline material exposed at the substrate surface during step 222.
- the material removal process performed in step 222 will form a damage-free and clean surface on the substrate, which is important to assure a high quality epitaxial layer is formed during the subsequent deposition process step(s).
- the RF generator 123 is adapted to deliver an average RF bias power between about 25 W and about 500 W to the conductive element disposed in the substrate support 162 to perform the etching process.
- step 216 is performed after step 220, but prior to performing step 222.
- steps 220 and 222 are performed in different chambers so that the gettering layer is not deposited on the surface of the oxidized substrate (step 216) prior to performing step 222.
- step 220 is performed on the substrate, then the substrate is removed from the cleaning chamber so that a dummy substrate can be inserted to allow step 216 to be performed without coating the surface of the oxidized substrate with the gettering material, and then the dummy substrate is removed and the oxidized substrate is reinserted so that step 222 can be performed.
- Figure 4 schematically illustrates a partial sectional side view of a cleaning chamber 300 that generally illustrates a mechanism that may cause the physical etching process.
- the cleaning chamber 300 having a chamber body 301 defining a process region 302.
- a substrate 303 to be cleaned may be disposed in the process region 302 on a substrate support 304.
- a coil 305 is positioned outside an upper portion of the chamber body 301 to generate a plasma 308 in an upper portion of the process region 302.
- a RF source 306 may be connected to the coil 305 to provide RF energy for plasma generation.
- a bias source 307 may be coupled to the substrate support 304 to provide a bias potential to the substrate 303 and/or the substrate support 304.
- Activated species 309 or ions 310 generated in the plasma 308 may be attracted to a top surface 303A of the substrate 303 to remove materials thereon.
- energy of the activated species 309 and/or ions 310 may be adjusted so that no physical damage will occur to the top surface 303A during material removal.
- the adjustment may be achieved by lowering the substrate RF bias power, adjusting bias potential applied across the substrate, pulsing RF power delivered to the plasma generating components (e.g., inductive coupled device (e.g., coil), capacitively coupled device (e.g., showerhead, microwave source), pulsing substrate RF bias power, forming a plasma that contains light atomic species in etching gas, using a plasma shield to confine the plasma, adjusting processing position of the substrate relative to the plasma, and/or a combination thereof.
- the plasma generating components e.g., inductive coupled device (e.g., coil), capacitively coupled device (e.g., showerhead, microwave source), pulsing substrate RF bias power, forming a plasma that contains light atomic species in etching gas, using a plasma shield to confine the plasma, adjusting processing position of the substrate
- the energy of the activated species may be reduced by using a lowered RF bias power delivered to the substrate support.
- the power of a bias source such as the bias source 307 in Figure 4 may be set at about 5OW for removing silicon dioxide from a top surface of the a substrate.
- the potential of a bias source may be adjusted to be less cathodic to reduce the bias on the substrate.
- the bias source may be eliminated and the substrate is positioned on a grounded substrate support.
- a reversed bias may be applied to apply a repelling force to ions and reactive ion species in the plasma.
- a reversed bias may be used when cleaning a silicon-on- insulator substrate.
- the plasma energy may be reduced by pulsing the RF source and/or the substrate bias source.
- the degree of energy reduction may be controlled by adjusting duty cycle of the RF pulses delivered to the plasma generating components (e.g., coil, showerhead, microwave source).
- Pulsing the RF source reduces density of activated species in a plasma generated by the RF source.
- a RF source is pulsed to maintain a low energy plasma in a cleaning chamber during a cleaning process. Pulsing the RF source reduces the overall plasma and activated species density in the plasma processing region, and therefore reduces the energy and number of bombarding species to avoid damages to the substrate.
- the etching gas comprises one or more lighter species that used to generate the low energy plasma to reduce or minimize any damage created on the substrate surface by physical etching processes.
- a lighter gas species such as helium (He), neon (Ne), hydrogen (H 2 ), or combinations thereof may be added to an etching gas that contains other process gases, such as argon (Ar).
- the etching gas comprises argon and helium.
- the etching gas substantially comprises argon, helium, and hydrogen gas.
- the etching gas comprises argon and hydrogen.
- the etching gas comprises argon and nitrogen.
- the etching gas substantially comprises helium (He), neon (Ne), or hydrogen (H 2 ).
- a plasma shield 140 may be positioned near the surface of a substrate during processing.
- Figure 2B schematically illustrates a cross-sectional side view of one embodiment of the cleaning chamber 100 that contains a plasma shield 140.
- the plasma shield is used to reduce or minimize the amount of and/or the energy of the bombarding species near the surface of the substrate.
- the plasma shield 140 may be a perforated or porous material that allows portions of the plasma and/or process gases to pass through during processing.
- the perforations are a plurality of holes 141 that pass through the plasma shield.
- the plasma shield is made of a dielectric material, or is coated with a dielectric material, that is compatible with the plasma and process gases ⁇ e.g., quartz, SiO 2 ).
- the plasma shield is made from the same material as other components in the chamber, such as the material from which the chamber lid 129 or chamber walls 128 are made.
- the plasma shield is made from a material selected from a group consisting of silicon, yttrium, yttrium oxide, germanium, boron, phosphorous, and silicon germanium compounds.
- relative position of a substrate being processed and the plasma generated in a cleaning chamber may be adjusted to adjust amount of bombardment of the substrate surface by the ions or active species in the plasma. Similar adjustment is described in the commonly assigned United States Patent
- the exemplary etching process of step 222 may be performed in a cleaning chamber similar to the cleaning chamber 100 of Figure 1 to remove silicon oxides formed on a top surface of a substrate.
- the chamber pressure may be maintained at about 1 mTorr to about 1 Torr. In one embodiment, the chamber pressure may be maintained at between about 20 mTorr to about 800 mTorr.
- An etching gas comprising helium and argon may be provided to the process region. In one embodiment, the chamber pressure may be about 5 mTorr to about 20 mTorr and the etching gas comprises primarily helium.
- the substrate being processed may also be heated to a temperature up to about 700°C.
- the cleaning chamber may be maintained at a temperature between about 20°C to about 400 0 C. In one embodiment, the chamber is maintained at a temperature of about 30°C. It is believed that maintaining the chamber walls at a lower temperature may help reduce the erosion of the chamber walls.
- steps 220, 222 may be repeated one or more times until the substrate is cleaned. Once the substrate surface is cleaned then step 224 and/or step 226 may then be performed on the clean substrate surface.
- a passivation treatment is performed to the cleaned substrate so that the substrate remains clean until a subsequent epitaxial deposition process.
- the passivation treatment comprises flowing a passivation gas and generating a plasma of the passivation gas.
- the passivation gas comprises a dilute concentration of hydrogen gas (H 2 ) that is used to terminate the cleaned silicon surface with hydrogen.
- the passivation treatment comprises delivering a hydrogen containing gas comprising about 1% of hydrogen gas while the substrate is maintained at a temperature between about 50 and about 500 0 C.
- an epitaxial silicon layer may be grown on the cleaned substrate in an epitaxial chamber.
- a substrate is positioned in a epitaxial chamber set to an elevated temperature, for example, about 500 °C to 800 0 C, and a reduced pressure state or atmospheric pressure.
- a silicon containing gas such as monosilane gas or dichlorosilane gas, is supplied to the epitaxial chamber and a silicon epitaxial layer is grown by vapor phase growth to form a semiconductor layer having the same crystalline orientation as the substrate on which it is grown.
- the processes may operate at a range of pressures from about 0.1 Torr to about 760 Torr.
- Hardware that may be used to deposit silicon-containing films includes the Epi Centura RTM system and the Poly Gen RTM system available from Applied Materials, Inc., located in Santa Clara, Calif.
- a detailed description of an epitaxial chamber may be found in United States Patent Application Serial No. 11/767,619 (Docket No. 10394), entitled “Modular CVD EPI 300mm Reactor,” filed June 25, 2007, which is incorporated herein by reference.
- the method 200 may be performed in a cluster tool comprising a cleaning chamber and an epitaxial chamber.
- a substrate may be wait a period of time after performing a conventional cleaning process (e.g., wet clean processes) before it is it is transferred into an epitaxial deposition chamber to form an epitaxial layer.
- the process of waiting can affect the cleanliness of the substrate surface, which can affect the wafer to wafer process results.
- the timing between the completion of step 224 and the subsequent epitaxial layer deposition process i.e., step 226) is scheduled such that the substrate is transferred to the epitaxial chamber immediately after passivation process has been completed.
- the use of a controller 147 that controls the process timing, or scheduling, can improve the process repeatability and device yield.
- a queuing step may be added before step 224 to eliminate waiting after passivation.
- step 222 and/or step 224 are not started until the controller 147 is sure that the epitaxial deposition chamber will be ready to receive the substrate when step 222 and/or step 224 is completed.
- steps 220 is performed in a first cleaning chamber 100
- step 222 is performed in a second cleaning chamber 100 to reduce any process affect that step 220 may have step 222 or vice versa.
- the first cleaning chamber 100 may perform steps 212-220 and the second cleaning chamber 100 may perform steps 212-216 and steps 222-224.
- the controller 147 is generally designed to facilitate the control and automation of the first cleaning chamber 100 and system 400 ( Figure 5) and typically may include a central processing unit (CPU) (not shown), memory (not shown), and support circuits (or I/O) (not shown).
- the CPU may be one of any form of computer processors that are used in industrial settings for controlling various chamber processes and hardware ⁇ e.g., detectors, motors, fluid delivery hardware, etc.) and monitor the system and chamber processes (e.g., substrate position, process time, detector signal, etc.).
- the memory is connected to the CPU, and may be one or more of a readily available memory, such as random access memory (RAM), read only memory (ROM), floppy disk, hard disk, or any other form of digital storage, local or remote.
- Software instructions and data can be coded and stored within the memory for instructing the CPU.
- the support circuits are also connected to the CPU for supporting the processor in a conventional manner.
- the support circuits may include cache, power supplies, clock circuits, input/output circuitry, subsystems, and the like.
- a program (or computer instructions) readable by the controller 147 determines which tasks are performable on a substrate.
- the program is software readable by the controller 147, which includes code to generate and store at least process recipe sequencing, substrate positional information, the sequence of movement of the various controlled components, process control, process timing, scheduling, queuing steps, and any combination thereof.
- FIG. 5 illustrates a plan view of a cluster tool 400 for semiconductor processing in accordance with one embodiment of the present invention.
- a cluster tool is a modular system comprising multiple chambers which perform various functions in a semiconductor fabrication process.
- the cluster tool 400 comprises a central transfer chamber 401 connected to a front end environment 404 via a pair of load locks 405.
- Factory interface robots 408A and 408B are disposed in the front end environment 404 and are configured to shuttle substrates between the load locks 405 and a plurality of pods 403 mounted on the front end environment 404.
- a plurality of chambers 407, 408, 409, and 410 are mounted to the central transfer chamber 401 for performing a desired process.
- a central robot 406 disposed in the central transfer chamber 401 is configured to transfer substrates between the load locks 405 and the chambers 407, 408, 409, 410, or among the chambers 407, 408, 409, 410.
- the cluster tool 400 comprises a cleaning chamber, such as the cleaning chamber 100 of Figure 1 , and two epitaxial chambers 407, 408.
- the chamber 410 may be a cleaning chamber, such as the cleaning chamber 100 described in Figure 1.
- the chamber 410 is configured to clean a substrate prior to an epitaxial growth process.
- the chambers 407, 408 may be epitaxial chambers capable of perform an epitaxial growth process.
- An exemplary epitaxial chamber may be found in United States Patent Application Serial No. 11/767,619 (Docket No. 10394), entitled “Modular CVD EPI 300mm Reactor," filed June 25, 2007, which is incorporated herein by reference.
- the cluster tool 400 may be used to performed the method 200 described above.
- a substrate that is to be processed may arrive to the cluster tool 400 in a pod 403.
- the substrate is transferred from the pod 403 to the vacuum compatible load lock 405 by the factory interface robot 408A or 408B.
- the substrate is then picked by the central robot 406 in the transfer chamber 401 which is generally kept in a vacuum state.
- the central robot 406 then loads the substrate into the cleaning chamber 410, whose inner surface has been regenerated and coated as described in step 212, 214, 216 of the method 200.
- a clean process including steps 220, 222, 224 of the method 200 may be performed in the cleaning chamber 410 to the substrate.
- the central robot 406 picks up the substrate from the cleaning chamber 410 and loads the substrate into the epitaxial chamber 407 or 408 whichever is available.
- An epitaxial layer may be grown on the cleaned substrate in the epitaxial chamber 407 or 408.
- the cluster tool 400 is configured such that it contains two cleaning chambers 100 (or 100a) that are positioned in the chamber 409 and chamber 410 positions ( Figure 5) and two epitaxial chambers positioned in the chamber 407 or chamber 408 positions.
- step 220 in one cleaning chamber (e.g., chamber 410) and perform steps 222 and 224 in the other cleaning chamber (e.g., chamber 409) before performing the epitaxial layer deposition step 226 in either of the epitaxial chambers 407, 408.
- the cluster tool comprises a plasma immersion ion implantation (P3I) chamber.
- the chamber 409 may be a P3I chamber configured to implant one or more dopant into the epitaxial layer on the substrate.
- Exemplary P3I chamber may be found in United States Patent No. 6,939,434, entitled “Externally Excited Torroidal Plasma Source with Magnetic Control of Ion Distribution,” and United States Patent No 6,893,907, entitled “Fabrication of Silicon- on-lnsulator Structure Using Plasma Immersion Ion Implantation,” which are incorporated herein by reference.
Abstract
Description
Claims
Priority Applications (5)
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CN2008801005838A CN101765900B (en) | 2007-07-26 | 2008-07-08 | Method and apparatus for cleaning a substrate surface |
KR1020107001821A KR101087925B1 (en) | 2007-07-26 | 2008-07-08 | Method and apparatus for cleaning a substrate surface |
KR1020137031794A KR20130135404A (en) | 2007-07-26 | 2008-07-08 | Method and apparatus for cleaning a substrate surface |
KR1020117022788A KR101389801B1 (en) | 2007-07-26 | 2008-07-08 | Method and apparatus for cleaning a substrate surface |
JP2010518270A JP2010534935A (en) | 2007-07-26 | 2008-07-08 | Method and apparatus for cleaning a substrate surface |
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US12/146,177 US8008166B2 (en) | 2007-07-26 | 2008-06-25 | Method and apparatus for cleaning a substrate surface |
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Also Published As
Publication number | Publication date |
---|---|
CN101765900B (en) | 2012-04-04 |
TWI368267B (en) | 2012-07-11 |
JP2013012752A (en) | 2013-01-17 |
US20110263103A1 (en) | 2011-10-27 |
CN101765900A (en) | 2010-06-30 |
KR20100041786A (en) | 2010-04-22 |
KR101087925B1 (en) | 2011-11-28 |
JP2010534935A (en) | 2010-11-11 |
KR20110120359A (en) | 2011-11-03 |
CN102569136A (en) | 2012-07-11 |
KR20130135404A (en) | 2013-12-10 |
CN102569136B (en) | 2015-08-19 |
JP5599437B2 (en) | 2014-10-01 |
TW201207920A (en) | 2012-02-16 |
US8008166B2 (en) | 2011-08-30 |
TWI455194B (en) | 2014-10-01 |
US20130068390A1 (en) | 2013-03-21 |
US20090029528A1 (en) | 2009-01-29 |
KR101389801B1 (en) | 2014-04-29 |
TW200915402A (en) | 2009-04-01 |
US8309440B2 (en) | 2012-11-13 |
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