WO2005011002A1 - シリコン系薄膜太陽電池 - Google Patents
シリコン系薄膜太陽電池 Download PDFInfo
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- WO2005011002A1 WO2005011002A1 PCT/JP2004/010248 JP2004010248W WO2005011002A1 WO 2005011002 A1 WO2005011002 A1 WO 2005011002A1 JP 2004010248 W JP2004010248 W JP 2004010248W WO 2005011002 A1 WO2005011002 A1 WO 2005011002A1
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- silicon
- layer
- refractive index
- solar cell
- photoelectric conversion
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- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 137
- 239000010703 silicon Substances 0.000 title claims abstract description 137
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000010409 thin film Substances 0.000 title claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 90
- 229910021419 crystalline silicon Inorganic materials 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 239000000470 constituent Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 12
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 11
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 237
- 239000010408 film Substances 0.000 description 23
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 239000004065 semiconductor Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 13
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- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000031700 light absorption Effects 0.000 description 9
- 239000011787 zinc oxide Substances 0.000 description 9
- 229910021417 amorphous silicon Inorganic materials 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 8
- 229910044991 metal oxide Inorganic materials 0.000 description 7
- 150000004706 metal oxides Chemical class 0.000 description 7
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- 238000000151 deposition Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 238000000391 spectroscopic ellipsometry Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910017875 a-SiN Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical group N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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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
- H01L31/04—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
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/0445—PV modules or arrays of single PV cells including thin film solar cells, e.g. single thin film a-Si, CIS or CdTe 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
- H01L31/04—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 potential barriers
- 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 potential barriers the potential barriers being only of the PIN type, e.g. amorphous silicon PIN solar cells
- H01L31/077—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 potential barriers the potential barriers being only of the PIN type, e.g. amorphous silicon PIN solar cells the devices comprising monocrystalline or polycrystalline materials
-
- 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
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/056—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means the light-reflecting means being of the back surface reflector [BSR] type
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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
- H01L31/04—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 potential barriers
- 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 potential barriers the potential barriers being only of the PIN type, e.g. amorphous silicon PIN 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
- H01L31/04—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 potential barriers
- 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 potential barriers the potential barriers being only of the PIN type, e.g. amorphous silicon PIN solar cells
- H01L31/076—Multiple junction or tandem 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
- Y02E10/52—PV systems with concentrators
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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
- 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
Definitions
- the present invention relates to a silicon-based thin-film solar cell, and in particular, a thin-film solar that exhibits a light confinement effect by disposing a layer having a smaller refractive index than the photoelectric conversion layer behind the photoelectric conversion layer viewed from the light incident side. It relates to batteries. Background art
- thin-film solar cells have also diversified, and in addition to conventional amorphous thin-film solar cells, crystalline thin-film solar cells have been developed, and hybrid thin-film solar cells in which these are stacked are also put into practical use.
- a thin film solar cell generally includes a first electrode, one or more semiconductor thin film photoelectric conversion units, and a second electrode, which are sequentially stacked on a 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 is a substantially intrinsic semiconductor layer and occupies most of the thickness of the photoelectric conversion unit, and the photoelectric conversion action mainly occurs in the i-type layer. For this reason, this i-type layer is usually called an i-type photoelectric conversion layer or simply a photoelectric conversion layer.
- the photoelectric conversion layer is not limited to an intrinsic semiconductor layer, and may be a layer doped with a small amount of p-type or n-type as long as loss of light absorbed by a doped impurity does not cause a problem.
- the photoelectric conversion layer is preferably thicker for light absorption, but if it is thicker than necessary, the cost and time for film formation 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 solar cells, 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 the impurities doped in the conductive layer is a loss that does not contribute to power generation. Therefore, p-type and n-type conductive layers can be used as long as they are within the range that can generate a sufficient diffusion potential. It is preferable to keep the thickness as small as possible.
- the pin (nip) type photoelectric conversion unit or thin film solar cell as described above has its main part regardless of whether the p-type and n-type conductive layers included therein are amorphous or crystalline.
- the photoelectric conversion layer occupying is amorphous, it is called an amorphous unit or an amorphous thin-film solar cell, and when the photoelectric conversion layer is crystalline, it is called a crystalline unit or a crystalline thin-film solar cell. .
- a method for improving the conversion efficiency of a thin-film solar cell there is a method in which two or more photoelectric conversion units are stacked to form a tandem type.
- a front unit including a photoelectric conversion layer having a large band gap is disposed on the light incident side of the thin film solar cell, and a rear unit including a photoelectric conversion layer having a small band gap is sequentially disposed thereafter.
- This enables photoelectric conversion over a wide wavelength range of incident light, thereby improving the conversion efficiency of the entire solar cell.
- tandem solar cells those in which an amorphous photoelectric conversion unit and a crystalline photoelectric conversion unit are laminated are 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, but i-type crystalline silicon has a longer wavelength of about 110 nm.
- an amorphous silicon photoelectric conversion layer with a large light absorption coefficient may have a thickness of about 0.3 ⁇ or less for light absorption, but a crystalline silicon photoelectric conversion layer with a small light absorption coefficient is long.
- Arranging behind the photoelectric conversion layer when viewed from the light incident side means that it is in contact with the photoelectric conversion layer and arranged on the back side of the photoelectric conversion layer, or another layer is arranged on the back side of the photoelectric conversion layer, and the layer is sandwiched between them. Means that it is placed on the back side.
- a transparent first electrode an amorphous silicon semiconductor thin film (hereinafter simply referred to as a semiconductor thin film), and an oxide having a thickness of less than 120 OA
- a semiconductor thin film an amorphous silicon semiconductor thin film
- an oxide having a thickness of less than 120 OA The structure of a solar cell in which a zinc film and an opaque second electrode (metal electrode) are sequentially laminated is disclosed.
- the zinc oxide film has a function of preventing an increase in absorption loss due to the formation of silicide at the interface between the semiconductor thin film and the metal electrode.
- the semiconductor thin film / zinc oxide It has the effect of improving the reflectance at the film interface. This improves the short-circuit current density of the solar cell and improves the conversion efficiency.
- the zinc oxide film is formed by sputtering, spraying, etc., it is necessary to use equipment that is separate from the semiconductor thin film that is generally formed by the plasma CVD method. The problem of lengthening occurs.
- the semiconductor thin film described above is composed of a p-type a-SiC: H film, a non-doped a_Si: H film, and an n-type a-Si: H film.
- the thickness of the n-type a _S i: H film generally requires 1 5 0 to 3 0 0 A
- the absorption loss of light when passing through the n-type a—S i: H film cannot be ignored.
- amorphous silicon oxide (hereinafter a-SiN or a_SiO) Z metal oxide layer / highly reflective metal layer / substrate structure is disclosed.
- this a—S i ON (a-S i O) layer has an amorphous semiconductor layer on the metal oxide layer.
- It is formed for the purpose of preventing an increase in absorption loss due to reduction of the metal oxide layer that may occur during the formation, and includes an a—S i ON (a-S i O) layer and an intrinsic amorphous semiconductor.
- optical confinement can be performed using the difference in refractive index with the layer.
- the thickness of the a—S i ON (a—S i O) layer is set as thin as 200 A, a sufficient light confinement effect cannot be expected.
- Japanese Patent Laid-Open No. 6-267868 includes a microcrystalline phase of silicon characterized by decomposition of a raw material gas having a value of 0 2 (SiH 4 + C0 2 ) of 0 ⁇ 6 or less.
- a—SiO film formation method is disclosed. The film is described as shows a low absorption coefficient and a high photoconductivity above 10- 6 SZc m, suitable for a window layer of amorphous silicon solar cell.
- the refractive index of the obtained film there is no description regarding the refractive index of the obtained film, and there is no description that the film can be disposed behind the photoelectric conversion layer of the solar cell when viewed from the light incident side.
- the present inventors have used Si H 4 , C 0 2 , H 2 and PH 3 as reactive gases in the n-type layer of pin-type silicon thin film solar cells.
- the application of a silicon oxide layer by high frequency plasma CVD was investigated.
- the silicon oxide layer is placed behind the photoelectric conversion layer and the C0 2 / SiH 4 ratio is increased to increase the amount of oxygen in the layer, resulting in a difference in refractive index from the photoelectric conversion layer. It was found that increasing the value increases the light confinement effect and increases the short-circuit current of the solar cell.
- silicon oxide simply using silicon oxide as the n-type layer has the problem that the series resistance of the solar cell increases and the conversion efficiency decreases. This is thought to be due to the contact resistance between silicon oxide and a metal oxide layer such as Z ⁇ that is part of the back electrode.
- the conventional technology has not solved the problem of the series resistance of solar cells, which is considered to be caused by the contact resistance generated between the silicon-based low refractive layer typified by silicon oxide and the back electrode.
- the present invention provides a layer having a refractive index lower than that of the photoelectric conversion layer as viewed from the light incident side without using a photoelectric conversion layer and other types of equipment. By arranging it rearward, it can exert a sufficient light confinement effect, and It is an object of the present invention to provide a silicon-based thin film solar cell with high efficiency and low cost, which can keep the series resistance of the solar cell small even when a layer having a low refractive index is disposed.
- a silicon-based thin-film solar cell according to the present invention is a silicon-based thin-film solar cell in which a silicon-based low refractive index layer and a silicon-based interface layer are sequentially disposed behind a photoelectric conversion layer as viewed from the light incident side. .
- the silicon-based low refractive index layer plays a role of generating a diffusion potential in the photoelectric conversion layer, and is a layer doped p-type or n-type with impurities.
- the silicon-based low-refractive index layer effectively reflects light on the surface to the photoelectric conversion layer side and keeps the light absorption loss in the layer as small as possible. Therefore, the refractive index at a wavelength of 60 nm is 2 It is preferable that the thickness is 5 or less and the thickness is 30 OA or more.
- the silicon-based low refractive index layer is an alloy layer composed of elements such as silicon and oxygen, represented by silicon oxide, and the ratio of the most abundant constituent elements excluding silicon in the layer is 25 atomic% or more.
- the silicon-based low refractive index layer preferably contains a crystalline silicon component in the layer in order to reduce the resistance in the thickness direction of the layer itself.
- the silicon-based interface layer is a conductive layer mainly composed of silicon. Since the silicon-based interface layer does not need to contribute to the generation of the diffusion potential in the photoelectric conversion layer, the thickness is preferably 15 OA or less in order to keep the light absorption loss in the layer as small as possible. More preferably, the thickness should be 10 OA or less. Further, in order to keep the contact resistance with the back electrode small, it is preferable that the layer contains a crystalline silicon component.
- the present inventors have intensively studied the structure of the optimal solar cell. did. As a result, a thin silicon-based interface layer is disposed behind the silicon-based low refractive index layer, and the contact resistance with the back electrode layer including the metal oxide layer disposed behind the thin silicon-based interface layer is improved. Series resistance is reduced and conversion efficiency is improved. I found out.
- the silicon-based interface layer disposed between the silicon-based low refractive index layer and the back electrode layer has a small contact resistance with both the silicon-based low refractive index layer and the back electrode layer, As a result, it is thought that the series resistance of the solar cell is reduced.
- the silicon-based low refractive index layer when silicon oxide is used as the silicon-based low refractive index layer and the amount of oxygen in the layer is increased to lower the refractive index to 2.5 or less, the silicon-based low refractive index layer Although it is difficult to lower the contact resistance between the back electrode layer and the back electrode layer, this problem can be solved by inserting a silicon-based interface layer.
- the silicon-based low refractive index layer can be designed to have an optimum thickness and refractive index for optical confinement.
- the refractive index of the silicon-based low-refractive index layer can be easily adjusted by simply changing the film-forming conditions, so the optical confinement effect is increased by more precise optical design, such as periodically changing the refractive index in the film thickness direction. You can also expect big.
- a transparent electrode layer 2 is formed on the translucent substrate 1.
- Transparency electrode layer 2 is rather preferably be composed of S n 0 2, Z n conductive metal oxides such as O, CVD, sputtering, it is preferably formed using a method such as vapor deposition.
- the transparent electrode layer 2 desirably has an effect of increasing the scattering of incident light by having fine irregularities on the surface.
- An amorphous photoelectric conversion unit 3 is formed on the transparent electrode layer 2.
- the amorphous photoelectric conversion unit 3 includes an amorphous p-type silicon carbide layer 3 p, a non-doped amorphous i-type silicon photoelectric conversion layer 3 i, and an n-type silicon-based interface layer 3 n.
- a crystalline photoelectric conversion unit 4 is formed on the amorphous photoelectric conversion unit 3.
- a high-frequency plasma CVD method is suitable for forming the amorphous photoelectric conversion unit 3 and the crystalline photoelectric conversion unit 4 (hereinafter, both units are collectively referred to as a photoelectric conversion unit).
- the formation conditions of the photoelectric conversion unit are as follows: substrate temperature 10 to 30 ° C., pressure 30 to 15 500 Pa, high frequency power density 0.0 1 to 0.5 cm 2 force S Preferably used.
- a silicon-containing gas such as Si H 4 or Si 2 H 6 or a mixture of these gases and H 2 is used.
- a dopant gas for forming the P-type or n-type layer in the photoelectric conversion unit B 2 H 6 or PH 3 is preferably used.
- Crystalline photoelectric conversion layer 4 consists of crystalline p-type silicon layer 4p, crystalline i-type silicon photoelectric conversion layer 4i, n-type silicon-based low refractive index layer 4on, and n-type silicon-based interface It consists of layers 4 n. Silicon oxide is typically used as the n-type silicon-based low refractive index layer 4 on. In this case, the source gas used is a mixture of Si H 4 , H 2 , C 0 2 , and PH 3 Gas is suitable.
- the silicon-based low refractive index layer 4 on may or may not contain a crystalline silicon component.
- the refractive index at a wavelength of 60 nm of the silicon-based low refractive index layer 4 on is preferably 2.5 or less.
- the thickness of the silicon-based low refractive index layer 4 on is preferably 30 OA or more, more preferably from 500 to 90 OA.
- silicon oxide is used as the silicon-based low-refractive index layer 4 on, the ratio of oxygen in the layer or the gas ratio of C 0 2 / Si H 4 is required to realize the refractive index. , About 2 to 10 are used.
- the silicon-based low refractive index layer 4 on may have a constant refractive index in the film thickness direction, or the refractive index may change along the way. Further, the refractive index may be periodically increased or decreased.
- the n-type silicon-based low refractive index layer 4 on is in contact with the crystalline i-type silicon photoelectric conversion layer 4 i behind the crystalline i-type silicon photoelectric conversion layer 4 i when viewed from the light incident side.
- another layer such as an n-type silicon layer is sandwiched between the crystalline i-type silicon photoelectric conversion layer 4 i and the n-type silicon-based low refractive index layer 4 on. It may be.
- the silicon-based low refractive index layer 4 on is replaced with silicon nitride, silicon carbide, silicon oxynitride, silicon oxyhydride, etc., instead of silicon oxide. It may be a layer containing one or more elements of elemental and oxygen.
- An n-type silicon-based interface layer 4 n is formed on the n-type silicon-based low refractive index layer 4 on.
- crystalline silicon is mainly used.
- the n-type silicon-based interface layer 4 n is used to improve the contact resistance between the n-type silicon-based low-refractive index layer 4 on and the back electrode 5, and minimizes the light absorption loss in this layer. Therefore, it is desirable to have the smallest possible thickness. Specifically, a thickness of 15 OA or less, more preferably 10 OA or less is used. Further, the n-type silicon-based interface layer 4 n may have a conductivity of about 1 to 10 2 S / cm.
- the n-type silicon-based interface layer 4 n may contain one or more elements of oxygen, carbon, and nitrogen to the extent that the contact resistance with the back electrode 5 is not increased.
- a back electrode 5 is formed on the n-type silicon-based interface layer 4 n.
- the back electrode 5 is composed of a transparent reflective layer 5 t and a back reflective layer 5 m.
- a metal oxide such as ZnO and ITO is used for the transparent reflective layer 5 t, and Ag, A 1 or an alloy thereof is preferably used for the back reflective layer 5 m.
- a method such as sputtering or vapor deposition is preferably used.
- the number of photoelectric conversion units 4 is not necessarily two, but an amorphous or crystalline single structure, a laminated type of three or more layers It may be a solar cell structure.
- FIG. 2 the number of photoelectric conversion units 4 is not necessarily two, but an amorphous or crystalline single structure, a laminated type of three or more layers It may be a solar cell structure. Furthermore, FIG.
- FIG. 2 shows a structure in which a photoelectric conversion layer, a silicon-based low refractive index layer, and an n-type silicon-based interface layer are arranged in this order on a light-transmitting substrate.
- a so-called reverse type structure in which an n-type silicon-based interface layer, a silicon-based low refractive index layer, and a photoelectric conversion layer are sequentially deposited on a substrate may be used.
- the present invention is based on patent applications related to the results of commissioned research by the government (Japan, Heisei 15 New Energy and Industrial Technology Development Organization "Solar Power Generation Technology Research and Development Contract Project" Applicable to Article 30 of the Act). Brief Description of Drawings
- FIG. 1 is a diagram showing the relationship between the amount of oxygen in the silicon-based low refractive index layer and the refractive index.
- FIG. 2 is a schematic cross-sectional view of a thin film solar cell including a silicon-based low refractive index layer according to the present invention.
- FIG. 3 is a schematic cross-sectional view of a hybrid thin film solar cell fabricated in each example and comparative example.
- FIG. 4 is a diagram showing a reflection spectrum measured by applying light from the exposed surface after etching away the back electrode of the solar cell fabricated in Example 1 and Comparative Example 1.
- Fig. 5 Silicon-based low refractive index
- FIG. 6 is a graph showing the relationship between the refractive index of a layer and the conversion efficiency of a hybrid thin film solar cell.
- Figure 6 shows the relationship between the thickness of the silicon-based low refractive index layer and the conversion efficiency of the hybrid thin film solar cell.
- FIG. 7 is an enlarged cross-sectional view of a transmission electron microscope (TEM) photograph of the silicon-based thin film solar cell of the present invention obtained in Example 1.
- TEM transmission electron microscope
- FIG. 3 is a cross-sectional view schematically showing a hybrid thin film solar cell produced in each example and each comparative example.
- the transparent substrate 1 on which the transparent electrode layer 2 is formed is introduced into a high-frequency plasma CVD apparatus, heated to a predetermined temperature, and then the thickness 1 6 OA amorphous! ) Type silicon carpide layer 3 p, thickness 3 0 0 OA
- An n-doped amorphous i-type silicon photoelectric conversion layer 3 i and an n-type silicon layer 3 n having a thickness of 30 OA were sequentially laminated.
- a plasma CVD apparatus is used to form a p-type crystalline silicon layer 4 p having a thickness of 15 OA and a crystalline i-type silicon photoelectric layer having a thickness of 1.4 / xm.
- a conversion layer 4 i, an n-type silicon-based low refractive index layer 4 on with a thickness of 60 OA, and an n-type crystalline silicon-based interface layer 4 n with a thickness of 50 to 70 A were sequentially stacked.
- the n-type silicon-based low-refractive-index layer 4 on is formed by the following conditions: substrate deposition surface-electrode distance 10 to 15 mm, pressure 350 to 1 300 Pa, high frequency power density 0.1 to 0. 1 3 W / cm 2 , Si H 4 / C 2 / PH 3 ZH 2 The flow rates were set to 1 5/1 20 / 0.5.
- the refractive index measured by spectroscopic ellipsometry of the n-type silicon-based low refractive index layer deposited on glass with 250 OA under the same film forming conditions was 1.9 at a wavelength of 600 nm.
- the deposition conditions for the n-type silicon-based interface layer 4 n are: substrate deposition surface-electrode distance 10 to 15 mm, pressure 350 to 1 300 Pa, high frequency power density 0.1 lW / cm 2 , S i H 4 / PH 3 / H 2 flow rate was 20 / 0.5 / 5/2500 sccm, respectively. Further, the conductivity of the n-type silicon-based interface layer deposited at 2500 A on glass under the same film forming conditions was 12 S / cm.
- a transparent reflective layer (not shown) made of Z ⁇ having a thickness of 300 A and a back reflective layer (not shown) made of Ag having a thickness of 2000 A were formed as the back electrode 5 by DC sputtering.
- the YAG second harmonic pulse laser is transmitted.
- a plurality of back electrode layer separation grooves 5a were formed.
- an island-shaped separation region was formed by forming a plurality of back surface electrode separation grooves perpendicularly intersecting the back surface electrode layer separation groove 5a.
- a back electrode layer separation groove is further formed outside the island-shaped separation region adjacent to one back electrode layer separation groove 5a, and solder is infiltrated into the inside to make contact with the transparent electrode layer 2.
- region 6 a hybrid thin film solar cell was fabricated. This hybrid thin-film solar cell has an effective area of 1 cm 2 , and in Example 1, the above-mentioned is formed on one substrate. A total of 25 solar cells were fabricated.
- the hybrid thin-film solar cell fabricated in Example 1 was subjected to simulated sunlight with a spectral distribution of AMI.5 and an energy density of 10 OmW / cm 2 under a measurement atmosphere and solar cell temperature of 25 ⁇ 1 ° C. Measure the output characteristics of the thin-film solar cell by measuring the voltage and current between the positive electrode probe 7 that was irradiated and contacted with the transparent electrode layer 2 through the contact region 6 and the negative electrode probe 8 that was in contact with the back electrode 5 did. Table 1 shows the average performance of the 25 hybrid thin film solar cells fabricated in Example 1.
- FIG. 4 shows the reflection spectrum measured by irradiating light from the n-type silicon-based interface layer 4n side in this state.
- the n-type silicon-based interface layer 4 n was removed by a reactive ion etching (R I E) method to expose the n-type silicon-based low refractive index layer 4 on.
- the refractive index of this silicon-based low refractive index layer measured by spectroscopic ellipsometry was 1.93 at a wavelength of 600 nm.
- the amount of oxygen in the silicon-based low refractive index layer measured by X-ray photoelectron spectroscopy (XP S) was 48 atomic%.
- Example 2 In Example 2, almost the same process as in Example 1 was performed, but only the film-forming conditions of the n-type silicon-based low refractive index layer 4 on were changed, and the refractive index at a wavelength of 600 nm was 1.65-2. . The point of change in the range of 5 to 5 was different from Example 1.
- Figure 5 shows the relationship between the refractive index of the silicon-based low refractive index layer and the conversion efficiency of the hybrid thin film solar cell.
- Example 3 almost the same process as in Example 1 was performed, except that the thickness of the n-type silicon-based low refractive index layer 4 on was changed in the range of 100 to 1 000 A as in Example 1. It was different.
- Figure 6 shows the relationship between the thickness of the silicon-based low-refractive index layer and the conversion efficiency of the obtained hybrid thin-film solar cell.
- Example 1 In Comparative Example 1, only the following points were different from Example 1.
- n-type silicon instead of laminating the low refractive index layer 4 on and the n-type crystalline silicon-based interface layer 4 n sequentially, an n-type crystalline silicon layer with a thickness of 15 OA and a Z ⁇ ⁇ layer with a thickness of 600 A Laminated sequentially.
- the ZnO layer was formed by DC sputtering.
- the refractive index measured by spectroscopic ellipsometry of the Z ⁇ ⁇ layer deposited on glass with 25 OA under the same film forming conditions was 1.9 at a wavelength of 60 nm.
- Table 1 shows the average performance of the 25 hybrid thin-film solar cells fabricated in Comparative Example 1.
- Comparative Example 2 was different from Example 1 only in that the formation of the n-type silicon-based interface layer 4 n on the n-type silicon-based low refractive index layer 4 on was omitted.
- Table 1 shows the average performance of the 25 integrated hybrid thin film solar cells fabricated in Comparative Example 2.
- Example 1 From comparison between Example 1 and Comparative Example 1, it can be seen that in Example 1, the short-circuit current is improved by 4% or more compared to Comparative Example 1. In Example 1, this is because most of the light that reaches behind the crystalline i-type silicon photoelectric conversion layer 4 i is composed of the crystalline i-type silicon photoelectric conversion layer 4 i and the n-type silicon-based low refractive index layer 4 on.
- Comparative Example 1 Whereas the ratio of light passing through the n-type crystalline silicon-based interfacial layer 4 n that is reflected to the i-side and has a large light absorption loss is 4 In crystalline i-type This is because an n-type crystalline silicon layer and a Z ⁇ layer are sequentially stacked behind the photoelectric conversion layer 4 i, and the ratio of light passing through the n-type crystalline silicon layer having a large light absorption loss is large. In addition, in Example 1, damage to the underlying crystalline silicon layer during sputtering of the ZnO layer, which occurs in the process of Comparative Example 1, can be prevented.
- Example 1 Next, from a comparison between Example 1 and Comparative Example 2, it can be seen that the curvature factor is improved by about 5% in Example 1 compared to Comparative Example 2.
- this is because the n-type crystalline silicon-based interface layer 4 n is inserted between the n- type silicon-based low-refractive index layer 4 on and the transparent reflective layer 5 t, so that the series resistance of the solar cell is reduced. This is because of the improvement.
- the crystalline i-type silicon photoelectric conversion layer It can be seen that it is possible to detect whether or not a silicon-based low refractive index layer 4 on having a smaller refractive index is disposed behind 4 i.
- the refractive index of the silicon-based low refractive index layer has an optimum value, and the refractive index is preferably 2.5 or less. It can be seen from Fig. 1 that this condition corresponds to an oxygen content of 25 atomic% or more in the layer. This is because when the refractive index exceeds 2.5, the refractive index difference from the adjacent crystalline i-type silicon photoelectric conversion layer is small and the light confinement effect is small.
- the results of Example 3 shown in FIG. 6 indicate that there is an optimum value for the thickness of the silicon-based low refractive index layer, and a thickness of 30 O A or more is preferable.
- the silicon-based low refractive index layer having a refractive index lower than that of the photoelectric conversion layer is viewed from the light incident side without using the photoelectric conversion layer formation and other types of equipment. Since it can be formed behind the photoelectric conversion layer, a sufficient light confinement effect can be exhibited at low cost. Furthermore, by arranging a thin silicon-based interface layer behind the silicon-based low refractive index layer, the series resistance of the solar cell can be kept small. As a result, a silicon-based thin film solar cell can be provided with high efficiency and low cost. Industrial applicability
- a silicon-based low-refractive index layer having a lower refractive index than that of the photoelectric conversion layer is formed behind the photoelectric conversion layer as viewed from the light incident side without using a separate type of equipment from the formation of the photoelectric conversion layer. Since it can be formed, a sufficient light confinement effect can be achieved at low cost. Furthermore, by arranging a thin silicon-based interface layer behind the silicon-based low refractive index layer, the series resistance of the solar cell can be kept small. As a result, a silicon-based thin film solar cell can be provided with high efficiency and low cost.
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EP04747712.0A EP1650812B2 (en) | 2003-07-24 | 2004-07-12 | Method for making a silicon based thin film solar cell |
CN2004800210593A CN1826699B (zh) | 2003-07-24 | 2004-07-12 | 硅类薄膜太阳能电池 |
AT04747712T ATE512467T1 (de) | 2003-07-24 | 2004-07-12 | Verfahren zur herstellung einer dünnschichtsiliziumsolarzelle |
JP2005512009A JP4257332B2 (ja) | 2003-07-24 | 2004-07-12 | シリコン系薄膜太陽電池 |
AU2004259486A AU2004259486B2 (en) | 2003-07-24 | 2004-07-12 | Silicon based thin film solar cell |
US10/563,009 US7847186B2 (en) | 2003-07-24 | 2004-07-12 | Silicon based thin film solar cell |
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Also Published As
Publication number | Publication date |
---|---|
KR101024288B1 (ko) | 2011-03-29 |
US20060174935A1 (en) | 2006-08-10 |
JP4257332B2 (ja) | 2009-04-22 |
EP1650812A4 (en) | 2009-08-12 |
AU2004259486B2 (en) | 2010-02-18 |
ATE512467T1 (de) | 2011-06-15 |
KR20060035751A (ko) | 2006-04-26 |
EP1650812A1 (en) | 2006-04-26 |
CN1826699B (zh) | 2010-12-29 |
CN1826699A (zh) | 2006-08-30 |
JPWO2005011002A1 (ja) | 2006-09-14 |
AU2004259486A1 (en) | 2005-02-03 |
US7847186B2 (en) | 2010-12-07 |
EP1650812B1 (en) | 2011-06-08 |
EP1650812B2 (en) | 2019-10-23 |
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