WO2003085746A1 - Method for fabricating tandem thin film photoelectric converter - Google Patents
Method for fabricating tandem thin film photoelectric converter Download PDFInfo
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- WO2003085746A1 WO2003085746A1 PCT/JP2003/004245 JP0304245W WO03085746A1 WO 2003085746 A1 WO2003085746 A1 WO 2003085746A1 JP 0304245 W JP0304245 W JP 0304245W WO 03085746 A1 WO03085746 A1 WO 03085746A1
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- photoelectric conversion
- thin film
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- 239000010409 thin film Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 142
- 239000007789 gas Substances 0.000 claims abstract description 45
- 239000010408 film Substances 0.000 claims abstract description 36
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000001257 hydrogen Substances 0.000 claims abstract description 26
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004065 semiconductor Substances 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 10
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- 238000004519 manufacturing process Methods 0.000 claims description 31
- 230000015572 biosynthetic process Effects 0.000 claims description 25
- 230000002441 reversible effect Effects 0.000 claims description 17
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 13
- 229910021419 crystalline silicon Inorganic materials 0.000 claims description 11
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 11
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
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- 229910019142 PO4 Inorganic materials 0.000 description 1
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- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910008310 Si—Ge Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Classifications
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/06—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 adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier
- H01L31/075—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 adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PIN type
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/06—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 adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier
- H01L31/075—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 adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PIN type
- H01L31/076—Multiple junction or tandem solar cells
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/20—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof such devices or parts thereof comprising amorphous semiconductor materials
- H01L31/202—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof such devices or parts thereof comprising amorphous semiconductor materials including only elements of Group IV of the Periodic System
-
- 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
- Y02E10/547—Monocrystalline silicon PV cells
-
- 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
- Y02E10/548—Amorphous silicon PV cells
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a manufacturing method of a tandem-type thin film photoelectric conversion device, and more particularly to a manufacturing method capable of enhancing the flexibility of the manufacturing process and improving the production efficiency while suppressing the deterioration of the performance of the photoelectric conversion device.
- crystalline and “microcrystalline” in the present specification also include the meaning of partially including an amorphous state as commonly used in the art. Background art
- a silicon-based thin film photoelectric conversion device generally includes at least a first electrode, at least one semiconductor thin film photoelectric conversion unit, and a second electrode, which are sequentially stacked on an insulating substrate.
- One photoelectric conversion unit includes an i-type layer sandwiched between a p-type layer and an n-type layer.
- the i-type layer that occupies most of the thickness of the photoelectric conversion unit is a substantially intrinsic semiconductor layer, and the photoelectric conversion action mainly occurs in the i-type layer. Therefore, the i-type photoelectric conversion layer is preferably thicker for light absorption, but if it is thicker than necessary, the cost and time for the deposition will increase.
- the p-type and n-type conductive layers play a role in generating a diffusion potential in the photoelectric conversion unit, and the open-circuit voltage, which is one of the important characteristics of thin film photoelectric conversion devices, depends on the magnitude of this diffusion potential. The value of depends on.
- These conductive layers are inactive layers that do not directly contribute to photoelectric conversion, and the light absorbed by these layers does not contribute to power generation. Therefore, p-type and n-type conductive layers can generate a sufficient diffusion potential. It is preferable that the thickness is as small as possible.
- the photoelectric conversion unit or photoelectric conversion device is an i-type photoelectric converter that occupies the main part regardless of whether the p-type and n-type conductive layers contained therein are amorphous or crystalline.
- An amorphous layer is called an amorphous unit or an amorphous photoelectric conversion device, and an i-type layer is crystalline is called a crystalline unit or a crystalline photoelectric conversion device.
- the material for the conductive layer of the silicon-based photoelectric conversion device amorphous silicon or its alloy material, or crystalline silicon or its alloy material is usually used.
- the conductive type layer is made of an amorphous silicon material having a wider bandgap or a microcrystalline silicon material having a higher impurity activation rate than the photoelectric conversion layer (i layer). It is intended to obtain high photoelectric conversion characteristics with as little loss as possible.
- the conductive layer is generally formed by a method such as the plasma C VD method that is almost the same as that of the photoelectric conversion layer (i-type layer). It is formed from a reaction gas mixed with a doping gas containing conductivity type determining impurity atoms. In recent years, a modified process of the general plasma C V D method has been attempted to form a conductive layer.
- an i-type layer is once formed by a plasma C VD method, and then a plasma treatment is performed in an atmosphere in which a doping gas and a diluent gas such as hydrogen are mixed.
- a plasma doping method is disclosed in which the region near the surface of the i-type layer is made a conductive type layer.
- plasma treatment is performed in a hydrogen atmosphere to improve the crystallinity of the conductive type layer. A way to improve is described.
- film deposition by plasma CVD and subsequent plasma treatment are performed as a continuous process in a low-pressure reaction chamber, which results in the formation of a good bonding interface and high-quality conductivity.
- a mold layer can be formed.
- a method for improving the conversion efficiency of the thin film photoelectric conversion device there is a method of stacking two or more photoelectric conversion units into a tandem type.
- a front unit including a photoelectric conversion layer for example, amorphous silicon or Si—C alloy
- a small bandgap is sequentially provided thereafter
- a rear unit including a photoelectric conversion layer for example, Si-Ge alloy
- photoelectric conversion can be performed over a wide wavelength range of incident light, and the conversion efficiency of the entire photoelectric conversion device can be improved.
- tandem-type thin film photoelectric conversion devices those including both an amorphous photoelectric conversion unit and a crystalline photoelectric conversion unit are sometimes referred to as hybrid thin film solar cells.
- the wavelength of light that can be photoelectrically converted by i-type amorphous silicon is up to about 800 nm on the long wavelength side, while i-type crystalline silicon is about 110 nm longer than that. It is possible to perform photoelectric conversion up to light having a wavelength of.
- an amorphous silicon photoelectric conversion layer having a large light absorption is sufficient for light absorption even with a single layer having a thickness of about 0.3 ⁇ or less, but a crystalline silicon photoelectric conversion layer having a small light absorption coefficient is sufficient.
- the conversion layer preferably has a thickness of about 2 to 3 ⁇ m or more in order to sufficiently absorb long-wavelength light. That is, the crystalline photoelectric conversion layer is usually desired to have a thickness about 10 times larger than that of the amorphous photoelectric conversion layer.
- each photoelectric conversion unit In a tandem-type thin film photoelectric conversion device, it is desirable that each photoelectric conversion unit be formed under the optimum conditions. Therefore, each photoelectric conversion unit should be formed discontinuously using separate film formation devices. There is. In addition, in order to increase the flexibility of the manufacturing process of tandem-type thin film photoelectric conversion devices and improve the production efficiency, it is desirable to form each photoelectric conversion unit discontinuously using separate film forming devices. In some cases.
- the substrate including the unit is once taken out from the film forming apparatus into the atmosphere, and then the second photoelectric conversion unit is laminated, and then the tandem-type thin film photoelectric film obtained is obtained.
- the present inventors have experienced the fact that the characteristics of the converter are reduced compared to the case where the entire unit is formed continuously without taking the substrate into the atmosphere. Disclosure of the invention In view of the situation of the prior art as described above, the present invention provides a substrate having one or more units in the air from the film formation apparatus in the middle of the formation of a plurality of photoelectric conversion units included in the tandem-type thin film photoelectric conversion apparatus. The purpose is to minimize the decrease in photoelectric conversion efficiency caused by exposure to the air in the completed device.
- At least one photoelectric conversion unit is formed on a substrate in the film formation device, and the substrate having the photoelectric conversion unit is removed from the film formation device into the atmosphere. Then, the substrate is introduced into the film forming apparatus and exposed to plasma in a mixed atmosphere of gas and hydrogen containing a conductivity-determining impurity element of the same type as the uppermost conductive type layer of the photoelectric conversion tube on the substrate.
- a conductive intermediate layer is formed by performing a process and additionally supplying a semiconductor raw material gas into the film forming apparatus, and then the next photoelectric conversion unit is formed.
- the tandem thin film photoelectric conversion device preferably includes at least one amorphous silicon thin film photoelectric conversion unit and at least one crystalline silicon thin film photoelectric conversion unit.
- a non-doped intermediate layer having a thickness of 5 nm or less is subsequently formed, and then the substrate is taken out into the atmosphere.
- the plasma exposure treatment is performed for a treatment time of 60 seconds or less with a high-frequency discharge with a frequency of 1 3.5 6 MHz or more in a mixed atmosphere containing 20 ppm or more of a conductivity-determining impurity element-containing gas with respect to hydrogen. It is preferable. Further, it is preferable that the plasma exposure treatment and the formation of the conductive intermediate layer are performed under substantially the same pressure in the same film forming apparatus.
- FIG. 1 is a schematic cross-sectional view showing a tandem-type thin film photoelectric conversion device manufactured by a manufacturing method according to an embodiment of the present study.
- FIG. 2 shows a tandem type manufactured by a manufacturing method according to another embodiment of the present invention. It is typical sectional drawing which shows a thin film photoelectric conversion apparatus.
- FIG. 3 is a transmission electron microscope (TEM) photograph showing a cross-sectional structure near the boundary between the amorphous unit and the crystalline unit in the hybrid thin film photoelectric conversion device according to Example 1 of the present invention.
- TEM transmission electron microscope
- Fig. 4 is a TEM photograph showing a cross-sectional structure in the vicinity of the boundary between the amorphous unit and the crystalline unit in the hybrid thin film photoelectric conversion device according to the reference example.
- FIG. 1 a silicon-based tandem-type thin film photoelectric conversion device manufactured by a manufacturing method according to an embodiment of the present invention is shown in a schematic cross-sectional view.
- the transparent electrode 2 made of a transparent conductive oxide (TCO) film is formed on the transparent insulating substrate 1 such as glass.
- TCO transparent conductive oxide
- the mold layers 33 are preferably deposited sequentially by a plasma CVD method (of course, other vapor deposition methods may be used).
- the p-type layer 31, the substantially intrinsic semiconductor photoelectric conversion layer 3 2, and the n-type layer 33 are deposited in this order.
- the substrate 1 is taken out from the plasma C VD apparatus into the atmosphere, and thereby the surface of the reverse conductivity type layer 33 is exposed to the atmosphere. Thereafter, the substrate 1 is introduced into another plasma C VD apparatus, and a plasma exposure treatment is performed in a mixed atmosphere of a doping gas (for example, phosphine) containing the same conductivity type impurity element as that of the reverse conductivity type layer 33 and hydrogen.
- a doping gas for example, phosphine
- a doping gas containing phosphorus or oxygen can be used, and it is particularly preferable that phosphorus is contained.
- a doping gas containing boron or aluminum can be used, and in particular, it must contain boron (for example, Diborane).
- an intermediate layer 5 of the same reverse conductivity type is formed on the reverse conductivity type layer 33 subjected to the plasma exposure treatment. More specifically, if the reverse conductivity layer 33 is n-type, the intermediate layer 5 is also n-type, and if the reverse conductivity layer 33 is: p-type, the intermediate layer 5 is also p-type.
- the conductive intermediate layer 5 is preferably a fresh additional layer that can act to form a good n p (or p n) tunnel junction with the photoelectric conversion unit 4 to be formed next. Further, the conductive intermediate layer 5 is preferably deposited by a plasma C VD method. .
- the conductive intermediate layer 5 may be formed by newly adjusting a film forming gas containing a doping element after the plasma exposure treatment. However, after conducting the plasma exposure treatment with a doping gas and hydrogen, the semiconductor source gas is subsequently applied. It can be easily formed by additionally supplying to the reaction chamber.
- silane and germane can be used as semiconductor source gases, for example, silane for silicon, silane and methane for silicon carbide, and silane and germane for silicon germanium alloys.
- the reverse conductivity type intermediate layer 5 there is a one conductivity type layer 41 included in the second photoelectric conversion unit 4, a substantially intrinsic semiconductor amorphous or crystalline photoelectric conversion layer 42, and A conductive layer. 43 is preferably deposited sequentially by plasma C VD. Finally, the back electrode 10 is formed.
- the plasma exposure treatment, the formation of the conductive intermediate layer 5, and the formation of the one conductive type layer 41 in the second photoelectric conversion unit 4 are preferably performed in the same reduced pressure reaction chamber. It is preferable to carry out under the same pressure.
- the intermediate layer 5 ′ is continuously formed by supplying additional source gas for semiconductor such as silane to the reaction chamber immediately without stopping the generation of plasma by supplying high-frequency power.
- additional source gas for semiconductor such as silane
- the reverse conductivity type layer 3 3 of the first photoelectric conversion unit 3 is exposed to the atmosphere and its surface deteriorates.
- the same effect can be expected even in a plasma exposure process using only a hydrogen atmosphere without a doping gas.
- the plasma exposure treatment using only hydrogen may adversely affect the quality of the silicon film near the treatment surface, and it is considered preferable to perform the plasma exposure treatment using a mixed gas of doving gas and hydrogen.
- the hydrogen plasma treatment in which the doping gas is mixed is preferably performed within 2 minutes, more preferably within 1 minute, by high-frequency discharge at a frequency of 13.56 MHz or higher. Discharges at lower frequencies and longer processing times may increase side effects such as blaze damage near the processing surface.
- the discharge frequency in plasma processing it is possible to prevent an increase in the cost of the high-frequency power supply by using the same frequency as the subsequent process of forming the semiconductor layer. Therefore, it is also necessary to use a frequency of 13.66 MHz or higher. Is preferred. This is because it is widely recognized experimentally and industrially that it is preferable to use such high-frequency plasma discharge for the formation of a high-performance thin-film photoelectric conversion unit. Also, the plasma processing time is as short as possible from the viewpoint of productivity. Is preferred. Furthermore, in order to ensure that the addition of doping gas is effective, its concentration with respect to hydrogen is preferably 20 ppm or more.
- a plurality of photoelectric conversion units can be formed with separate plasma C VD devices in this way, the optimum equipment specifications and formation conditions are individually set to achieve the best characteristics required for each unit. It can be expected that the overall characteristics of the tandem-type thin film photoelectric conversion device can be improved.
- since it is possible to use multiple production lines for each unit it is possible to increase production efficiency and increase the flexibility of line changes and expansions.
- the use of multiple manufacturing equipment makes it possible to carry out maintenance smoothly.
- FIG. 2 a tandem-type thin film photoelectric conversion device manufactured by a manufacturing method according to another embodiment of the present invention is shown in a schematic sectional view.
- the device of FIG. 2 has a force similar to that of FIG. 1 in that an additional non-doped intermediate layer 6 is subsequently formed after deposition of the reverse conductivity type layer 3 3 contained in the first photoelectric conversion unit 3. Is different. It is preferable that the non-doped intermediate layer 6 has a thickness of 5 nm or less that can cause a tunnel effect.
- a plasma C V D method is preferable as a method for producing the non-doped intermediate layer 6, but various other forming methods can also be used.
- the substrate 1 is taken out from the plasma CVD apparatus into the atmosphere, and the outermost surface of the non-doped intermediate layer is exposed to the atmosphere.
- the impurity atom especially phosphorus for the n-type layer
- the surface tends to become porous, and the higher the doping concentration, the higher the doping concentration. The tendency becomes stronger. Therefore, if the porous surface of the conductive type layer 3 3 in the embodiment of FIG. 1 is exposed to the atmosphere, oxidation or adhesion of foreign matters is more likely to be promoted on the porous surface than on the flat surface. it is conceivable that.
- the surface of the non-doped intermediate layer 6 is less likely to be deteriorated or contaminated than the conductive layer 33 even if it is exposed to the atmosphere.
- the non-doped intermediate layer 6 is 5 nm or less in thickness, the tunnel effect is generated, so that the current is not hindered and it is unlikely that the electrical characteristics of the photoelectric conversion device are reduced. . JP03 / 04245 After the surface of the non-doped intermediate layer 6 is exposed to the atmosphere, in the case of FIG. 2 as well, as in the case of FIG. Subsequently, the reverse conductivity type intermediate layer 5 and the second photoelectric conversion unit 4 are formed by the plasma CVD method.
- the reverse conductivity type intermediate layer 5 is formed in either case, but this assists the function of the reverse conductivity type layer 33 of the first photoelectric conversion unit 3. It can also be considered as part of the reverse conductivity type layer 33.
- the reverse conductivity type intermediate layer 5 is not exposed to the atmosphere, and the one conductivity type layer 41 of the second photoelectric conversion unit 4 is continuously formed thereon, high photoelectric conversion is achieved in the tandem type photoelectric conversion device. It is inferred that the good np (or pn) tunnel junction desired to achieve the characteristics is formed.
- the photoelectric conversion device of the above embodiment is a so-called back electrode 10 formed after two photoelectric conversion units 3 and 4 including a semiconductor layer in order of pins are laminated on a glass substrate 1.
- a super straight structure may be used, or a so-called substrate structure in which a transparent electrode 10 is formed after a plurality of units 3 and 4 are formed on an arbitrary substrate 1 may be used.
- the present invention is not limited to the two-stack type tandem structure in which two photoelectric conversion units 3 and 4 are stacked, and it goes without saying that the present invention can also be applied to a tandem structure in which three or more photoelectric conversion units are stacked. .
- Example 1 corresponds to the method of manufacturing the thin-film solar cell in FIG. 2.
- a transparent electrode layer 2 mainly composed of tin oxide was formed on a transparent glass substrate 1.
- a laminate including the substrate 1 and the electrode layer 2 is introduced into the first plasma CVD apparatus, and the p-type amorphous silicon carbide layer 31 included in the amorphous silicon unit 3 at a predetermined substrate temperature.
- An i-type amorphous silicon photoelectric conversion layer 3 2 and an n-type microcrystalline silicon layer 33 were formed with thicknesses of 8 nm, 300 nm, and 10 nm, respectively.
- n-type layer 3 3 formation Thereafter, the non-doped intermediate layer 6 was formed to a thickness of 4 nm by blocking the phosphine of the doping gas in the same reaction chamber.
- the laminate was transferred to the unload chamber 1 of the first plasma C V D apparatus, and after the chamber 1 was quickly filled with nitrogen gas, the laminate was taken out into the atmosphere. The laminate was left in the atmosphere for about 40 hours and then introduced into the second plasma C V D apparatus.
- the plasma exposure treatment in the mixed atmosphere of phosphine and hydrogen, the formation of the n-type intermediate layer 5 and the formation of the p-type layer 41 are performed continuously in the same chamber at the same set pressure. ing. Furthermore, in this Example 1, the discharge frequency, The input power density, substrate temperature, and gas flow rate settings are also unified, and a series of processing and film formation processes can be performed quickly by simply opening and closing the valve of the gas introduction line and turning on / off the plasma discharge. Can be done.
- the standby time before the deposition of the n-type intermediate layer 5 and the p-type layer 41 can be as short as about 30 seconds in total. That is, even if the plasma exposure process and the film forming process of the n-type intermediate layer 5 are added, there is almost no time loss in the solar cell manufacturing process.
- the non-doped i-type crystalline silicon photoelectric conversion layer 4 2 and the n-type microcrystalline silicon layer 4 3 included in the crystalline silicon unit 4 are formed in the same second plasma CVD apparatus.
- the thickness was 1.7 ⁇ and 15 nm, respectively.
- a zinc oxide film having a thickness of 30 nm, a silver film having a thickness of 240 nm, and a titanium film having a thickness of 5 nm included in the back electrode 10 were formed by sputtering.
- a two-stack type hybrid thin-film solar cell in which amorphous silicon unit 3 and crystalline silicon unit 4 are laminated was formed.
- Example 2 the film thickness of the n-type microcrystalline silicon layer 3 3 in the amorphous silicon unit 3 is increased from 10 nm to 12 nm, and then the non-doped intermediate layer 6 is not formed. This was different from Example 1 only in that the object was taken out from the first plasma CVD apparatus into the atmosphere. That is, Example 2 corresponds to the method of manufacturing the hybrid thin film solar cell in FIG.
- the thickness of the n-type microcrystalline silicon layer 33 is set to 30 nm, and then the laminate is not exposed to the atmosphere and the n-type intermediate layer 5 is not formed. This was different from Example 2 only in that crystalline silicon unit 4 was formed.
- Example 2 As shown in Table 2, in any of the solar cells of Examples 1 and 2, the average photoelectric conversion efficiency decreased by less than 2% compared to the solar cell of the reference example formed without exposure to the atmosphere. It can be seen that the variation in conversion efficiency is similar. Further, it can be seen that the conversion efficiency of Example 1 in which the non-doped intermediate layer 6 was formed is slightly higher than that of Example 2.
- FIG. 3 is a transmission electron microscope (TEM) photograph showing a cross section near the boundary between the amorphous unit 3 and the crystalline unit 4 in Example 1. At the bottom of this photo The transparent electrode 2 also appears partially. If an oxide film or a contamination layer is formed on the non-doped intermediate layer 6 exposed to the atmosphere, such a foreign substance layer should be clearly observed in the TEM photograph. However, in the TEM photograph of FIG. 3, a clear foreign substance layer is not observed between the amorphous unit 3 and the crystalline unit 4, and only a change from amorphous to crystalline can be observed.
- TEM transmission electron microscope
- FIG. 4 is a TEM photograph showing a cross section near the boundary between the amorphous unit 3 and the crystalline unit 4 in the reference example.
- the laminate is not exposed to the atmosphere during the formation of the amorphous unit 3 and the crystalline unit 4, so the TEM photograph in FIG. 4 naturally shows that the amorphous unit 3 and the crystalline unit 4 During this period, no foreign material layer is observed, and only a change from amorphous to crystalline is observed.
- Comparative Example 1 was different from Example 1 only in that the plasma exposure treatment of the laminate surface was omitted in the second Plasma CVD apparatus.
- Comparative Example 2 plasma exposure treatment was performed on the surface of the laminate in an atmosphere containing only hydrogen gas in the second plasma CVD apparatus, and then additional introduction of silane gas and phosphine gas resulted in an n-type microcrystalline silicon intermediate layer 5 being formed. It was different from Example 1 only in that it was formed.
- Example 3 in the plasma exposure treatment of the surface of the laminate performed in a mixed gas atmosphere of phosphine and hydrogen, the concentration of phosphine with respect to hydrogen is 1/10 20 compared to Example 1. It was different from Example 1 only in that it was adjusted to 4 ppm (Comparative Example 3) of ppm (Example 3) and 1/50. From Table 2, it can be seen that the conversion efficiency of Comparative Example 3 in which 4 ppm of phosphine was added in the plasma exposure treatment was not significantly different from Comparative Example 2 in which phosphine was not added. However, the conversion efficiency of Example 3 with the addition of 20 ppm of phosphine indicates that the concentration of phosphine is sufficiently effective.
- Example 4 in the plasma exposure treatment of the surface of the laminate performed in a mixed atmosphere of phosphine and hydrogen gas, the treatment time is three times that of Example 1 and is 60 seconds (Example 4). ) And 9 times 1 80 seconds (Comparative Example 4). From Table 2, it can be seen that the plasma exposure treatment time is increased from 20 seconds in Example 1 to 60 seconds in Example 4, but the effect is not significantly different, but it is extended to 180 seconds in Comparative Example 4. It can be seen that the conversion efficiency actually decreases. Industrial applicability
- each photoelectric conversion unit can be formed discontinuously using separate film forming apparatuses, increasing the flexibility of the manufacturing process of the tandem-type thin film photoelectric conversion apparatus and increasing the production efficiency. It can be improved.
Description
Claims
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JP2003582830A JP3926800B2 (ja) | 2002-04-09 | 2003-04-02 | タンデム型薄膜光電変換装置の製造方法 |
KR1020047014976A KR100847487B1 (ko) | 2002-04-09 | 2003-04-02 | 탠덤형 박막 광전변환 장치의 제조방법 |
AU2003220852A AU2003220852B2 (en) | 2002-04-09 | 2003-04-02 | Method for fabricating tandem thin film photoelectric converter |
US10/508,044 US7238545B2 (en) | 2002-04-09 | 2003-04-02 | Method for fabricating tandem thin film photoelectric converter |
EP03715746A EP1503427A4 (en) | 2002-04-09 | 2003-04-02 | PROCESS FOR MANUFACTURING THIN FILM PHOTOELECTRIC CONVERTER IN TANDEM |
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US (1) | US7238545B2 (ja) |
EP (1) | EP1503427A4 (ja) |
JP (1) | JP3926800B2 (ja) |
KR (1) | KR100847487B1 (ja) |
CN (1) | CN100355091C (ja) |
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WO2010023948A1 (ja) * | 2008-08-29 | 2010-03-04 | 株式会社アルバック | 光電変換装置の製造方法、光電変換装置、及び光電変換装置の製造システム |
JPWO2010023948A1 (ja) * | 2008-08-29 | 2012-01-26 | 株式会社アルバック | 光電変換装置の製造方法、光電変換装置、及び光電変換装置の製造システム |
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US9012256B2 (en) | 2010-10-06 | 2015-04-21 | Mitsubishi Heavy Industries, Ltd. | Process for producing photovoltaic device |
Also Published As
Publication number | Publication date |
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EP1503427A4 (en) | 2011-09-28 |
US7238545B2 (en) | 2007-07-03 |
JP3926800B2 (ja) | 2007-06-06 |
US20050181534A1 (en) | 2005-08-18 |
KR20040104535A (ko) | 2004-12-10 |
KR100847487B1 (ko) | 2008-07-22 |
AU2003220852B2 (en) | 2008-12-11 |
CN100355091C (zh) | 2007-12-12 |
EP1503427A1 (en) | 2005-02-02 |
AU2003220852A1 (en) | 2003-10-20 |
CN1647285A (zh) | 2005-07-27 |
JPWO2003085746A1 (ja) | 2005-08-18 |
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