WO2012160718A1 - 薄膜形成装置 - Google Patents
薄膜形成装置 Download PDFInfo
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- WO2012160718A1 WO2012160718A1 PCT/JP2011/071655 JP2011071655W WO2012160718A1 WO 2012160718 A1 WO2012160718 A1 WO 2012160718A1 JP 2011071655 W JP2011071655 W JP 2011071655W WO 2012160718 A1 WO2012160718 A1 WO 2012160718A1
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- thin film
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- 239000010409 thin film Substances 0.000 title claims abstract description 64
- 239000000758 substrate Substances 0.000 claims abstract description 83
- 239000010408 film Substances 0.000 claims abstract description 48
- 238000002161 passivation Methods 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 19
- 239000012495 reaction gas Substances 0.000 claims abstract description 17
- 229910021419 crystalline silicon Inorganic materials 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 239000007858 starting material Substances 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 9
- 230000007423 decrease Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229910052581 Si3N4 Inorganic materials 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 229920005591 polysilicon Polymers 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
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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
- C23C16/44—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 method of coating
- C23C16/50—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 method of coating using electric discharges
- C23C16/505—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 method of coating using electric discharges using radio frequency discharges
- C23C16/509—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 method of coating using electric discharges using radio frequency discharges using internal electrodes
- C23C16/5096—Flat-bed apparatus
-
- 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
- C23C16/44—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 method of coating
- C23C16/455—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 method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
- C23C16/45565—Shower nozzles
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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
- C23C16/44—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 method of coating
- C23C16/455—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 method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
-
- 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
- C23C16/44—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 method of coating
- C23C16/50—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 method of coating using electric discharges
- C23C16/505—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 method of coating using electric discharges using radio frequency discharges
- C23C16/509—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 method of coating using electric discharges using radio frequency discharges using internal electrodes
-
- 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
- C23C16/44—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 method of coating
- C23C16/50—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 method of coating using electric discharges
- C23C16/515—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 method of coating using electric discharges using pulsed discharges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/02168—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells the coatings being antireflective or having enhancing optical properties for the solar cells
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to a thin film forming apparatus that performs film formation processing by exciting plasma.
- a plasma processing apparatus is used in a film forming process, an etching process, an ashing process, and the like because of high-precision process control.
- a plasma chemical vapor deposition (CVD) apparatus is known as a plasma processing apparatus.
- the raw material gas is turned into plasma by high-frequency power or the like, and a thin film is formed on the substrate by a chemical reaction.
- a plasma CVD apparatus using hollow cathode discharge has been proposed (see, for example, Patent Document 1).
- a silicon nitride film having a refractive index of 1.9 to 2.4 and a film thickness of about 70 to 100 nm is used for a passivation film such as an antireflection film of a crystalline silicon solar cell.
- a passivation film such as an antireflection film of a crystalline silicon solar cell.
- an AC power source having a frequency of 1 MHz or more is used.
- a thin film silicon film for a thin film transistor (TFT) is formed, there is no particular problem even if a frequency of 1 MHz or higher is used.
- TFT thin film transistor
- an antireflection film for a crystalline silicon solar cell if an AC power source having a frequency of 1 MHz or more is used, the passivation effect on the surface of the crystalline silicon film and the inside of the substrate is lowered, and the conversion efficiency of the solar cell There was a problem that decreased.
- an object of the present invention is to provide a thin film forming apparatus that forms a thin film in which a decrease in the passivation effect is suppressed and has high film forming efficiency.
- a thin film forming apparatus for forming a passivation film on a substrate, comprising: (a) a chamber into which a reaction gas containing a material gas for the passivation film is introduced; A substrate plate on which the substrate is placed, (c) an electrode disposed in the chamber and having a groove formed on the surface of the substrate plate facing the substrate, and (d) AC power having a frequency of 40 kHz to 450 kHz.
- a thin film forming apparatus provided with an AC power source that supplies plasma between a substrate plate and an electrode and excites plasma containing a source gas on the upper surface of the substrate while stopping the supply of AC power at a constant cycle.
- the present invention it is possible to provide a thin film forming apparatus that forms a thin film in which a decrease in the passivation effect is suppressed and has high film forming efficiency.
- a thin film forming apparatus 10 is a thin film forming apparatus that forms a passivation film 110 on a substrate 100.
- the thin film forming apparatus 10 includes a chamber 11 into which a reaction gas 120 containing a raw material gas for a passivation film 110 is introduced, a substrate plate 12 placed in the chamber 11 on which a substrate 100 is placed, and a chamber 11.
- the electrode 13 is disposed on the surface of the substrate plate 12 facing the substrate 100, the openings of the plurality of ejection holes 131 through which the reaction gas 120 passes and the grooves 132 formed around the openings.
- alternating-current power having a frequency of 50 kHz or more and 450 kHz or less is supplied between the substrate plate 12 and the electrode 13 while stopping the supply of the alternating-current power, and plasma containing a source gas is formed on the upper surface of the substrate 100. And an alternating current power source 14 to be excited.
- the reaction gas 120 is introduced into the chamber 11 by the gas supply mechanism 15. Further, the inside of the chamber 11 is depressurized by the gas exhaust mechanism 16. After the pressure of the reaction gas in the chamber 11 is adjusted to a predetermined gas pressure, a predetermined AC power is supplied between the substrate plate 12 and the electrode 13 by the AC power supply 14 through the matching box 141. Thereby, the reaction gas 120 containing the source gas in the chamber 11 is turned into plasma. By exposing the substrate 100 to the formed plasma, a desired thin film is formed on the exposed surface of the substrate 100.
- the openings of the ejection holes 131 and the grooves 132 are arranged on the surface of the electrode 13 facing the substrate 100, and the electrode 13 functions as a hollow cathode electrode that generates a hollow cathode discharge. That is, electrons are confined by the hollow cathode effect in the groove 132 formed on the surface of the electrode 13, and high-density plasma is stably generated in a form supplied from the groove 132. As a result, the source gas is efficiently decomposed, and the passivation film 110 is uniformly formed over a large area at a high speed.
- FIG. 2 shows an example in which grooves 132 are continuously formed around the ejection holes 131 on the surface 130 of the electrode 13 facing the substrate 100 along the arrangement direction of the ejection holes 131 for one row. If it is arranged around the opening of the ejection hole 131, various configurations can be adopted for the layout of the groove 132.
- the grooves 132 may be formed in a lattice shape so that the openings of the ejection holes 131 are arranged at the intersections of the lattice.
- the frequency of the AC power supplied between the electrodes is 1 MHz or more. For this reason, in the thin film forming apparatus 10 that uses AC power having a frequency of 50 kHz to 450 kHz, the supply of AC power is stopped at a constant period in order to stably form plasma in the chamber 11.
- the AC power supply 14 performs pulse control of the supply of AC power between the substrate plate 12 and the electrode 13 to periodically turn on / off the supply of AC power.
- the AC power is supplied between the substrate plate 12 and the electrode 13 so that the ON time and the OFF time are alternately repeated, with the ON time for supplying AC power being 600 ⁇ s and the OFF time for stopping the supply of AC power being 50 ⁇ s. Is done.
- the on time is set to about 300 ⁇ s to 1500 ⁇ s
- the off time is set to about 25 ⁇ s to 50 ⁇ s. If the off time is set too long, the power efficiency is lowered. Therefore, it is preferable to set the off time to about 50 ⁇ sec at the longest.
- the frequency of AC power is 1 MHz or more, it is not necessary to turn off the supply of AC power.
- the reason why the frequency of AC power supplied between the substrate plate 12 and the electrode 13 in the thin film forming apparatus 10 is set to 50 kHz to 450 kHz is that the number of ions colliding with the substrate 100 in a state where plasma is formed in the chamber 11 is large. It is to do. As a result, as described below, the surface and internal passivation effect of the substrate 100 can be increased, and the conversion efficiency of the crystalline silicon solar cell can be improved.
- a polysilicon substrate is used as a substrate for a crystalline silicon solar cell.
- the grain boundary of polysilicon becomes a defect.
- Carriers are supplemented by this defect, and conversion efficiency decreases.
- H ions or the like to collide with the substrate 100, dangling bonds of crystals in the polysilicon can be terminated with H ions. This reduces carrier supplementation due to defects and increases the passivation effect. As a result, the conversion efficiency of the crystalline silicon solar cell is improved.
- the graph shown in FIG. 3 shows the relationship between the frequency of power supplied between the electrodes and the number of ions colliding with the substrate surface (Akihisa Matsuda et al., “Influence of Power-Source Frequency on the Properties of GD a-Si : H ", Japanese Journal Applied Physics, Vol.23, N0.8, August, 1984, L568-L569).
- the frequency is 10 kHz to 500 kHz
- the number of ions that collide with the substrate is large, and when the frequency is 1 MHz or more, the number of ions that collide with the substrate is small.
- the frequency of the AC power supplied between the substrate plate 12 and the electrode 13 is 10 kHz to 500 kHz, a larger number of ions can collide with the substrate 100 than when the frequency is 1 MHz or more.
- the frequency of the AC power be 50 kHz to 450 kHz.
- the surface and internal passivation effect of the substrate 100 is increased by setting the frequency of the AC power supplied from the AC power supply 14 to 50 kHz to 450 kHz. That is, the thin film forming apparatus 10 can form a thin film having a high passivation effect. Thereby, the conversion efficiency of a solar cell can be improved, for example.
- the substrate 100 is a crystalline silicon solar cell substrate, and the passivation film 110 is an antireflection film.
- the substrate 100 is a substrate in which an n-type semiconductor layer having a surface diffusion concentration of 1 ⁇ 10 18 to 1 ⁇ 10 22 is formed on a p-type silicon substrate, or a surface diffusion concentration of 1 on the n-type silicon substrate.
- a substrate on which a p-type semiconductor layer of ⁇ 10 18 to 1 ⁇ 10 22 is formed can be used.
- the passivation film 110 is a silicon nitride (SiN) film having a refractive index of 1.3 to 3.0 and a film thickness of about 50 to 150 nm.
- a passivation film 110 made of, for example, a SiN film on the substrate 100 monosilane, ammonia, or the like is employed as a source gas, and nitrogen (N), hydrogen (H), argon (Ar), Helium (He) or the like is employed.
- the width of the groove 132 is set to 5 mm to 10 mm.
- the width of the groove formed on the surface of the high-frequency electrode is about 1 to 4 mm.
- plasma can be stably formed by increasing the width of the groove 132.
- the groove 132 preferably does not exceed 10 mm.
- the diameter of the opening part of the ejection hole 131 is dependent also on the number of the ejection holes 131 formed in the electrode 13, it is generally 1 mm or less.
- the pressure of the reaction gas is 500 Pa or more.
- the pressure of the reaction gas 120 including the source gas and the carrier gas is set to be as low as about 50 Pa to 100 Pa.
- conversion efficiency high solar cell conversion efficiency
- the temperature of the substrate 100 can be arbitrarily set by the heater 17 built in the substrate plate 12. As described above, by setting the temperature of the substrate 100 to 300 ° C. to 450 ° C., high conversion efficiency can be obtained. Further, it is more preferable that the temperature of the substrate 100 is 400 ° C. to 450 ° C.
- FIG. 5 shows an example in which a passivation film 110 is formed as an antireflection film for a crystalline silicon solar cell using the thin film forming apparatus 10 shown in FIG. 1 and the comparative thin film forming apparatus.
- the frequency of the AC power of the thin film forming apparatus 10 is 250 kHz.
- the frequency of AC power was 250 kHz, and parallel plate electrodes were used without using a hollow cathode electrode.
- a hollow cathode electrode is used, and the frequency of AC power is 213.56 MHz.
- the produced crystalline silicon solar cell has a structure in which a SiN film having a thickness of 80 nm is formed on a polysilicon substrate.
- the solar cell conversion efficiency is equal between the thin film forming apparatus 10 and the comparative example 1 in which the frequency of the AC power is 250 kHz.
- the film formation rate of Comparative Example 1 is 28 nm / min
- the film formation rate of the thin film forming apparatus 10 using the hollow cathode electrode is 180 nm / min, and the film forming efficiency of the thin film forming apparatus 10 is very high. Very expensive.
- the film forming rate is the same between the thin film forming apparatus 10 and the comparative example 2 using the hollow cathode electrode.
- the solar cell conversion efficiency of Comparative Example 2 in which the frequency of the AC power is 13.56 MHz is 16.3%, whereas the solar cell conversion efficiency of the thin film forming apparatus 10 is 16.5%. Greater than Example 2. That is, in Comparative Example 2 where the frequency of AC power is high, the passivation effect is greatly reduced, and the conversion efficiency is reduced. On the other hand, in the thin film forming apparatus 10, a decrease in the passivation effect is suppressed as compared with Comparative Example 2, and high conversion efficiency is obtained.
- the thin film forming apparatus 10 can achieve high film formation efficiency by using the hollow cathode electrode while obtaining high solar cell conversion efficiency by supplying an AC electrode having a low frequency.
- film formation using hollow cathode discharge can be realized using AC power having a frequency of 50 kHz to 450 kHz.
- AC power having a frequency of 50 kHz to 450 kHz As a result, it is possible to provide a thin film forming apparatus 10 that forms a thin film in which a decrease in the passivation effect is suppressed and has high film forming efficiency.
- the present invention is also applicable when the electrode 13 is not a shower plate type electrode as described above.
- the reaction gas 120 may be introduced directly into the chamber 11 from the gas supply mechanism 15 without passing the reaction gas 120 through the inside of the electrode 13.
- the electrode 13 having the groove 132 formed on the surface functions as a hollow cathode electrode. That is, the confinement of electrons due to the hollow cathode effect occurs in the groove 132 formed on the surface of the electrode 13, and high-density plasma is stably generated. As a result, the source gas is efficiently decomposed, and the passivation film 110 is uniformly formed over a large area at a high speed.
- the grooves 132 may be formed in a lattice shape or a stripe shape.
- the present invention is also applicable to the thin film forming apparatus 10 having a plurality of positions where the substrate 100 is arranged.
- the substrate plate 12 and the electrode 13 have a comb shape having a plurality of tooth portions extending in the vertical direction toward the paper surface, and the comb tooth portions of the substrate plate 12 and the electrode 13. Are arranged in the shape of cross fingers.
- the substrate 100 is mounted on each of a plurality of tooth portions facing the electrodes 13 of the substrate plate 12.
- the reaction gas 120 is introduced from the gas supply mechanism 15 into the chamber 11 of FIG. 7 in which the plurality of substrates 100 are arranged vertically.
- a groove 132 is formed on the surface of the tooth portion of the electrode 13, and the electrode 13 functions as a hollow cathode electrode.
- the groove 132 is formed through the tooth portion of the electrode 13. According to the thin film forming apparatus 10 shown in FIG. 7, it is possible to simultaneously form a passivation film on a plurality of substrates 100.
- the thin film forming apparatus of the present invention can be used for the purpose of forming a thin film in which a decrease in the passivation effect is suppressed.
Abstract
Description
Claims (9)
- 基板上にパッシベーション膜を形成する薄膜形成装置であって、
前記パッシベーション膜の原料ガスを含む反応ガスが導入されるチャンバーと、
前記チャンバー内に配置され、前記基板を載せる基板プレートと、
前記チャンバー内に配置され、前記基板プレート上の前記基板と対向する面に溝が形成された電極と、
50kHz以上且つ450kHz以下の周波数の交流電力を、該交流電力の供給を一定の周期で停止させながら、前記基板プレートと前記電極間に供給して前記基板の上面において前記原料ガスを含むプラズマを励起する交流電源と
を備えることを特徴とする薄膜形成装置。 - 前記電極に形成された前記溝の底部に、前記反応ガスが通過する複数の噴出孔の開口部が形成されていることを特徴とする請求項1に記載の薄膜形成装置。
- 前記交流電力の供給が停止される時間が25μ秒以上且つ50μ秒以下であることを特徴とする請求項1に記載の薄膜形成装置。
- 前記溝の幅が5mm以上且つ10mm以下であることを特徴とする請求項1に記載の薄膜形成装置。
- 前記プラズマが励起された状態において前記基板を300℃以上且つ450℃以下に設定する加熱装置を更に備えることを特徴とする請求項1に記載の薄膜形成装置。
- 前記チャンバー内の前記反応ガスの圧力が50Pa以上且つ100Pa以下に設定されることを特徴とする請求項1に記載の薄膜形成装置。
- 前記基板が結晶シリコン系太陽電池基板であることを特徴とする請求項1に記載の薄膜形成装置。
- 前記基板上に形成される前記パッシベーション膜が、結晶シリコン系太陽電池の反射防止膜であることを特徴とする請求項7に記載の薄膜形成装置。
- 前記基板上に形成される前記パッシベーション膜の成膜速度が180nm/分以上であることを特徴とする請求項1に記載の薄膜形成装置。
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KR1020137027164A KR101535582B1 (ko) | 2011-05-20 | 2011-09-22 | 박막 형성 장치 |
JP2013516164A JPWO2012160718A1 (ja) | 2011-05-20 | 2011-09-22 | 薄膜形成装置 |
CN201180069697.2A CN103534383B (zh) | 2011-05-20 | 2011-09-22 | 薄膜形成装置 |
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KR101602517B1 (ko) | 2008-08-04 | 2016-03-10 | 에이지씨 플랫 글래스 노스 아메리카, 인코퍼레이티드 | Pecvd를 이용한 박막 코팅을 증착하기 위한 플라즈마 소스 및 방법 |
CN107852805B (zh) * | 2014-12-05 | 2020-10-16 | Agc玻璃欧洲公司 | 空心阴极等离子体源 |
MY191327A (en) | 2014-12-05 | 2022-06-16 | Agc Flat Glass Na Inc | Plasma source utilizing a macro-particle reduction coating and method of using a plasma source utilizing a macro-particle reduction coating for deposition of thin film coatings and modification of surfaces |
JP6565502B2 (ja) * | 2015-09-03 | 2019-08-28 | 株式会社島津製作所 | 成膜装置及び成膜方法 |
US9721765B2 (en) | 2015-11-16 | 2017-08-01 | Agc Flat Glass North America, Inc. | Plasma device driven by multiple-phase alternating or pulsed electrical current |
US10573499B2 (en) | 2015-12-18 | 2020-02-25 | Agc Flat Glass North America, Inc. | Method of extracting and accelerating ions |
CN109576669A (zh) * | 2018-12-19 | 2019-04-05 | 北京建筑大学 | 一种空心阴极放电系统及制备类金刚石薄膜的方法 |
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DE10326135B4 (de) * | 2002-06-12 | 2014-12-24 | Ulvac, Inc. | Entladungsplasma-Bearbeitungsanlage |
JP3837539B2 (ja) * | 2003-03-25 | 2006-10-25 | 独立行政法人産業技術総合研究所 | プラズマcvd装置 |
JP5105898B2 (ja) * | 2007-02-21 | 2012-12-26 | 株式会社アルバック | シリコン系薄膜の成膜方法 |
JP5496568B2 (ja) * | 2009-08-04 | 2014-05-21 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理方法 |
US8026157B2 (en) * | 2009-09-02 | 2011-09-27 | Applied Materials, Inc. | Gas mixing method realized by back diffusion in a PECVD system with showerhead |
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KR101535582B1 (ko) | 2015-07-09 |
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