WO2013031843A1 - 光電変換素子とその製造方法並びに光電変換装置 - Google Patents
光電変換素子とその製造方法並びに光電変換装置 Download PDFInfo
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- WO2013031843A1 WO2013031843A1 PCT/JP2012/071860 JP2012071860W WO2013031843A1 WO 2013031843 A1 WO2013031843 A1 WO 2013031843A1 JP 2012071860 W JP2012071860 W JP 2012071860W WO 2013031843 A1 WO2013031843 A1 WO 2013031843A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 230000031700 light absorption Effects 0.000 claims abstract description 90
- 239000004065 semiconductor Substances 0.000 claims abstract description 87
- 239000000203 mixture Substances 0.000 claims abstract description 55
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 230000007547 defect Effects 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000005215 recombination Methods 0.000 abstract description 3
- 230000006798 recombination Effects 0.000 abstract description 3
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract 3
- 239000011669 selenium Substances 0.000 abstract 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 13
- 239000010408 film Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 229910052738 indium Inorganic materials 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 229910052733 gallium Inorganic materials 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 229910052951 chalcopyrite Inorganic materials 0.000 description 4
- -1 chalcopyrite compound Chemical class 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 230000003405 preventing effect Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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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
- H01L31/0248—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 characterised by their semiconductor bodies
- H01L31/0256—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 characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/032—Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
- H01L31/0322—Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312 comprising only AIBIIICVI chalcopyrite compounds, e.g. Cu In Se2, Cu Ga Se2, Cu In Ga Se2
-
- 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
- H01L31/065—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 graded gap 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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
- Y02E10/541—CuInSe2 material 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 photoelectric conversion element, a manufacturing method thereof, and a photoelectric conversion device.
- a photoelectric conversion device is composed of a photoelectric conversion element having a light absorption layer such as a chalcopyrite-based CIGS as a constituent unit, and a plurality of such photoelectric conversion elements are connected in series or in parallel on a substrate such as glass. Yes.
- This photoelectric conversion device is provided with a buffer layer on the light receiving surface side, that is, on the light absorption layer.
- This buffer layer is formed by chemically growing from a solution by a solution deposition method (CBD method) or the like in order to obtain a suitable heterojunction with the light absorption layer.
- CBD method solution deposition method
- the band gap is still small due to the negative band offset ⁇ Ec2. In some cases, the photoelectric conversion efficiency is not sufficiently satisfied.
- a compound containing Se and at least one selected from Zn and In is known to prevent damage to the first semiconductor layer when the second semiconductor layer is formed on the first semiconductor layer by sputtering by interposing the A layer (see Patent Document 1). .
- a trace element composed of a group IB element, a group III-B element and a group VI-B element. It is known to form a semiconductor layer that includes (see Patent Document 2).
- JP 2002-124688 A Japanese Patent Laid-Open No. 10-341029 JP-A-8-330614
- the photoelectric conversion element of the present invention comprises a light absorption layer of a group I-B group element, a group III-B group element, and a group I-III-VI compound provided on the lower electrode layer, and the light absorption layer. And a semiconductor layer of a group III-VI compound containing a group III-B element, S and Se, and a composition (atom) of Se of the group III-VI compound in the semiconductor layer. %) Is characterized in that the light absorption layer side is more than the opposite side of the light absorption layer.
- the method for producing a photoelectric conversion element of the present invention comprises a light absorption layer of a group I-III-VI group compound containing a group IB element, a group III-B element and Se, and a group III-B element, S and Se.
- a semiconductor layer of a III-VI group compound is formed on the light absorption layer while being immersed in a film-forming solution containing the film, while reducing the ratio of Se to S in the film-forming solution.
- the photoelectric conversion device of the present invention is characterized by using the photoelectric conversion element.
- a light absorption layer is obtained by containing a large amount of a Se compound of a group III-B element having a band offset larger than that of a sulfide of a group III-B element on the light absorption layer side of the semiconductor layer.
- the negative band offset ⁇ Ec2 at the interface between the semiconductor layer and the semiconductor layer can be changed to the positive band offset ⁇ Ec1, and the valence band level at the interface can be lowered.
- FIG. 3 is a ternary phase diagram of a Cu—In—Se based compound used in the semiconductor layer of the photoelectric conversion element according to the embodiment.
- the photoelectric conversion element 1 includes a substrate 2, a lower electrode layer 3, a light absorption layer 4, a semiconductor layer 5, an upper electrode layer 7, and a grid electrode 8.
- the substrate 2 is for supporting the photoelectric conversion element 1.
- Examples of the material used for the substrate 2 include glass, ceramics, resin, and metal.
- the lower electrode layer 3 is made of a conductor such as Mo, Al, Ti, or Au, and is formed on the substrate 2 by a sputtering method or a vapor deposition method.
- the light absorption layer 4 preferably contains a chalcopyrite material and has a function of generating charges by absorbing light.
- the light absorption layer 4 is not particularly limited, but is preferably a chalcopyrite compound semiconductor from the viewpoint that high photoelectric conversion efficiency can be obtained even with a thin layer of 10 ⁇ m or less.
- the chalcopyrite compound semiconductor in the present embodiment is an I-III-VI group compound containing a group IB element, a group III-B element, and Se, for example, Cu (In, Ga) Se 2 ( And CI (GS)) and Cu (In, Ga) (Se, S) 2 (also referred to as CIGSS).
- Cu (In, Ga) Se 2 refers to a compound mainly composed of Cu, In, Ga, and Se.
- Cu (In, Ga) (Se, S) 2 refers to a compound mainly composed of Cu, In, Ga, Se, and S.
- Such a light absorption layer 3 can be formed by the following method.
- a raw material element for example, an IB group element, a III-B group element, a VI-B group element, etc.
- a raw material element for example, an IB group element, a III-B group element, a VI-B group element, etc.
- a precursor containing an element is formed.
- the light absorption layer 4 which consists of a compound semiconductor can be formed by heating this precursor.
- a precursor is formed by forming a metal element (for example, a group IB element, a group III-B element, etc.) in the same manner as described above, and the precursor is formed in a gas atmosphere containing a group VI-B element. It can also be formed by heating with.
- the semiconductor layer 5 refers to a layer that performs a heterojunction with the light absorption layer 4.
- the semiconductor layer 5 is formed on the light absorption layer 4 with a thickness of about 5 nm to 200 nm.
- the light absorption layer 4 and the semiconductor layer 5 are preferably of different conductivity types.
- the semiconductor layer 5 is an n-type semiconductor.
- the semiconductor layer 5 should have a resistivity of 1 ⁇ / cm or more. Further, the semiconductor layer 5 preferably has a light-transmitting property with respect to the wavelength region of light absorbed by the light absorption layer 4 in order to increase the light absorption efficiency of the light absorption layer 4.
- Such a semiconductor layer 5 is formed by a wet film forming method.
- the wet film formation method is a method in which a raw material solution is applied on the light absorption layer 4 and chemically reacted by a process such as heating, or deposited on the light absorption layer 4 by a chemical reaction in a solution containing the raw material. It is a method to make it.
- the semiconductor layer 5 is diffused to some extent on the light absorption layer 4 side, and the heterojunction between the light absorption layer 4 and the semiconductor layer 5 can be made favorable with few defects. .
- the upper electrode layer 7 is a layer having a resistivity lower than that of the semiconductor layer 5, and is for taking out charges generated in the light absorption layer 4.
- the resistivity of the upper electrode layer 7 is less than 1 ⁇ / cm and the sheet resistance is 50 ⁇ / ⁇ or less.
- the upper electrode layer 5 preferably has a light-transmitting property with respect to the light absorbed by the light absorption layer 4 in order to increase the absorption efficiency of the light absorption layer 4.
- the upper electrode layer 7 has a thickness of 0.05 to 0.5 ⁇ m. It is preferable to set it as the thickness.
- the refractive indexes of the upper electrode layer 7 and the semiconductor layer 5 are substantially equal.
- the upper electrode layer 7 is preferably a 0.05 to 3 ⁇ m transparent conductive film such as ITO or ZnO, and is formed by sputtering, vapor deposition, chemical vapor deposition (CVD), or the like. .
- the photoelectric conversion device 10 is formed by arranging a plurality of photoelectric conversion elements 1, and adjacent photoelectric conversion elements 1 are connected in series by connection conductors (not shown).
- the current collection electrode 8 which consists of the finger electrode 8a and the bus-bar electrode 8b.
- the photoelectric conversion element 1 of the present embodiment includes a light absorption layer 4 of an I-III-VI group compound containing a group IB element, a group III-B element, and Se provided on the lower electrode layer 3, a light A photoelectric conversion device 1 having a semiconductor layer 5 of a III-VI group compound containing III-B group elements, S and Se, provided on the absorption layer 4, wherein the III-VI group compound in the semiconductor layer 5
- the composition (atomic%) of Se is larger on the light absorption layer 4 side than on the opposite side to the light absorption layer 4.
- composition of Se in the semiconductor layer 5 plotted with a circle is opposite to the light absorption layer 4 on the light absorption layer 4 side. It turns out that it is more than the side.
- the Se composition contains an average of 25 atomic% or more on the light absorption layer 4 side in order to make the band offset positive, and the light absorption layer 4 and the semiconductor layer 5 in the semiconductor layer 5 It is important that the Se composition increases from the interface 9 to a range of 10 nm or more (range B) from the viewpoint of setting the band offset to a positive value.
- the band offset ⁇ Ec2 that was a negative value at the interface 9 between the light absorption layer 4 and the semiconductor layer 5 is a positive value.
- ⁇ Ec1 and carrier recombination due to crystal defects can be suppressed to improve photoelectric conversion efficiency.
- the hole blocking effect can be maintained.
- the Se composition monotonously decreases as the distance from the interface 9 between the light absorption layer 4 and the semiconductor layer 5 increases.
- FIG. 7 is a graph of the composition distribution of the solar cell element 1 of the conventional product, and a suitable S and O composition distribution (S> O) at the interface 9.
- S S and O composition distribution
- FIG. 3 which is the present embodiment, although there is not much difference in the composition distribution of S and O at the interface 9, the Se composition distribution (thick line) in the semiconductor layer 5 is the light absorption layer 4 side. Since there are more than the opposite side to the light absorption layer 4, the photoelectric conversion efficiency became high.
- the Se composition distribution has a dominant influence on the photoelectric conversion efficiency rather than the S and O composition distribution.
- the light absorption layer 4 has a region 4a having a higher Se composition than the lower electrode layer 3 side on the semiconductor layer 5 side. That is, as shown in FIG. 1, the region 4a exists on the side of the light absorption layer 4 in contact with the semiconductor layer 5.
- the Se composition (thick line) in the light absorption layer 4 is raised in the region 4 a (range A) near the interface 9. .
- Se can be easily eluted from the surface of the light absorption layer 4 to the precursor of the semiconductor layer 5 during the formation of the semiconductor layer 5.
- Se easily diffuses from the surface of the light absorption layer 4 to the semiconductor layer 5, and O (oxygen), which is the same VI group element, moves from the semiconductor layer 4 side to the vicinity of the interface 9. Since diffusion can be suppressed, a good pn junction can be maintained.
- the average Se composition in the region 4 a is 5 atomic% or more with respect to the average Se composition in the entire light absorption layer 4.
- the region 4a has a higher composition of CuSe or CuSe 2 than other portions of the light absorption layer 4.
- Cu 2 Se, CuIn 5 Se 8 , and CuIn 3 Se 5 are on a straight line (thick line) connecting Cu 2 Se and In 2 Se 3 in the ternary phase diagram of the Cu—In—Se system shown in FIG. Cu 2 In 4 Se 7 , Cu 3 In 5 Se 9 and CuInSe 2 are stable Se compounds.
- CuSe or CuSe 2 is an unstable Se compound that easily elutes, Se easily elutes during the formation of the semiconductor layer 5 from the surface of the light absorption layer 4 to the semiconductor layer 5, or the semiconductor layer 5 can be easily diffused after formation.
- the region 4a is preferably in the range from the interface 9 between the light absorption layer 4 and the semiconductor layer 5 to 10 nm to 50 nm.
- the range of A corresponding to the region 4a is the range from the interface 9 to 40 nm, and the average Se composition is 52 to 56 atomic%.
- the Se composition tends to increase in the range from the interface 9 to 1 nm to 10 nm.
- the range B range from the interface 9 to 10 nm
- Se The composition is high.
- the average of the Se composition in the light absorption layer 4 is in the range of 40 to 60 atomic%, and the Se composition relative to the maximum value of the Se composition in the light absorption layer 4 is.
- the ratio of minimum values (minimum value of Se composition) / (maximum value of Se composition) is preferably 0.8 to 0.95.
- Se is likely to diffuse moderately from the surface of the light absorption layer 4 to the semiconductor layer 5, and the same VI group element O (oxygen) is introduced from the semiconductor layer 4 side to the interface 9. Since diffusion to the vicinity can be suppressed, a good pn junction can be maintained.
- the light absorption layer 4 of the I-III-VI group compound containing the IB group element, the III-B group element, and Se is used as the III-B group element, S, and Se.
- the semiconductor layer 5 of the III-VI compound is formed on the light absorption layer 4 while reducing the ratio of Se to S in the film-forming solution.
- a film-forming solution containing a III-B group element, S and Se is prepared, and the light absorption layer 4 of the I-III-VI group compound containing a IB group element, a III-B group element and Se is prepared. Start dipping.
- a second film-forming solution having a lower ratio of Se to S than the film-forming solution is added to the film-forming solution containing the group III-B element, S and Se as needed.
- the ratio of Se to S in the film solution is lowered.
- the film is immersed in a second film-forming solution having a lower ratio of Se to S than the film-forming solution, and then immersed in a third film-forming solution having a lower Se ratio.
- the ratio of Se in the semiconductor layer 5 is reduced.
- the Se composition of the III-VI group compound in the semiconductor layer 5 can be made larger on the light absorption layer 4 side than on the opposite side of the light absorption layer 4. .
- FIG. 5 is a graph showing the photoelectric conversion efficiency with respect to Se / (Se + S) or Se / (Se + S + O) in the semiconductor layer 5 near 5 nm from the interface 9, but Se / (Se + S) or Se / (Se + S + O) is large. It can be seen that the conversion efficiency is improved.
- the ratio of the concentration of Se to the concentration of all VI-B groups may be managed at, for example, about 0.6 or more.
- the composition of Se is high and the composition of S and O is low, so the ratio of Se / (Se + S) or Se / (Se + S + O) is close to 1.
- the desired photoelectric conversion element 1 can be obtained by the method for manufacturing the photoelectric conversion element 1 as described above.
- the composition of Se in the region 4a can be increased, and the diffusion of Se from the light absorption layer 4 to the semiconductor layer 5 can be promoted.
- the timing of introducing the H 2 Se gas is in the range of 400 to 450 ° C., it is preferable because the composition of Se in the region 4a can be easily increased.
- H 2 Se gas may be introduced during the formation of the light absorption layer 4 film.
- Photoelectric conversion element 2 Substrate 3: Lower electrode layer 4: Light absorption layer 4a: Region 5: Semiconductor layer 7: Upper electrode layer 8: Grid electrode (collecting electrode) 8a: finger electrode 8b: bus bar electrode 9: interface 10: photoelectric conversion device
Abstract
Description
図1に示すように光電変換素子1は、基板2と、下部電極層3と、光吸収層4と、半導体層5と、上部電極層7と、グリッド電極8とを含む。
図2において光電変換装置10は、光電変換素子1が複数並べて形成され、接続導体(不図示)によって、隣接する光電変換素子1同士が直列接続されている。
本実施形態における光電変換素子1の製造方法は、I-B族元素、III-B族元素およびSeを含むI-III-VI族化合物の光吸収層4をIII-B族元素、SおよびSeを含む成膜用溶液に浸漬し、該成膜用溶液におけるSに対するSeの比率を低くしながら、光吸収層4上にIII-VI族化合物の半導体層5を成膜する。
2:基板
3:下部電極層
4:光吸収層
4a:領域
5:半導体層
7:上部電極層
8:グリッド電極(集電電極)
8a:フィンガー電極
8b:バスバー電極
9:界面
10:光電変換装置
Claims (7)
- 下部電極層上に設けられた、I-B族元素、III-B族元素およびSeを含むI-III-VI族化合物の光吸収層と、
該光吸収層上に設けられた、III-B族元素、SおよびSeを含むIII-VI族化合物の半導体層とを有する光電変換素子であって、
前記半導体層における前記III-VI族化合物のSeの組成(原子%)は、前記光吸収層側の方が該光吸収層とは反対側よりも多い光電変換素子。 - 前記光吸収層は、前記半導体層側に前記下部電極層側よりもSeの組成が多い領域を有する、請求項1に記載の光電変換素子。
- 前記領域は、前記光吸収層の他の部位よりもCuSeまたはCuSe2の組成が多い、請求項2に記載の光電変換素子。
- 前記領域は、前記光吸収層と前記半導体層との界面から10nmまでの範囲~50nmまでの範囲である、請求項2または3に記載の光電変換素子。
- 前記光吸収層におけるSeの組成の平均は40~60原子%の範囲であって、
前記光吸収層におけるSeの組成の最大値に対するSeの組成の最小値の比(Seの組成の最小値)/(Seの組成の最大値)が0.8~0.95である、請求項1~4のいずれかに記載の光電変換素子。 - I-B族元素、III-B族元素およびSeを含むI-III-VI族化合物の光吸収層をIII-B族元素、SおよびSeを含む成膜用溶液に浸漬し、該成膜用溶液におけるSに対するSeの比率を低くしながら、前記光吸収層上にIII-VI族化合物の半導体層を成膜する光電変換素子の製造方法。
- 請求項1~5のいずれかに記載の光電変換素子を用いた光電変換装置。
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US14/342,233 US20140224311A1 (en) | 2011-08-30 | 2012-08-29 | Photoelectric conversion element, method of manufacturing same, and photoelectric conversion device |
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PCT/JP2012/071860 WO2013031843A1 (ja) | 2011-08-30 | 2012-08-29 | 光電変換素子とその製造方法並びに光電変換装置 |
Country Status (3)
Country | Link |
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US (1) | US20140224311A1 (ja) |
JP (1) | JP5784125B2 (ja) |
WO (1) | WO2013031843A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017059657A (ja) * | 2015-09-16 | 2017-03-23 | 株式会社東芝 | 光電変換素子および太陽電池 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH08111425A (ja) * | 1994-10-07 | 1996-04-30 | Matsushita Electric Ind Co Ltd | カルコパイライト構造半導体薄膜の製造方法 |
JP2003282909A (ja) * | 2002-03-26 | 2003-10-03 | Honda Motor Co Ltd | 化合物薄膜太陽電池およびその製造方法 |
JP2009206348A (ja) * | 2008-02-28 | 2009-09-10 | Honda Motor Co Ltd | カルコパイライト型太陽電池の製造方法 |
JP2010225829A (ja) * | 2009-03-24 | 2010-10-07 | Honda Motor Co Ltd | 薄膜太陽電池の光吸収層の形成方法 |
JP2011091249A (ja) * | 2009-10-23 | 2011-05-06 | Fujifilm Corp | 太陽電池 |
-
2012
- 2012-08-29 US US14/342,233 patent/US20140224311A1/en not_active Abandoned
- 2012-08-29 WO PCT/JP2012/071860 patent/WO2013031843A1/ja active Application Filing
- 2012-08-29 JP JP2013531364A patent/JP5784125B2/ja not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08111425A (ja) * | 1994-10-07 | 1996-04-30 | Matsushita Electric Ind Co Ltd | カルコパイライト構造半導体薄膜の製造方法 |
JP2003282909A (ja) * | 2002-03-26 | 2003-10-03 | Honda Motor Co Ltd | 化合物薄膜太陽電池およびその製造方法 |
JP2009206348A (ja) * | 2008-02-28 | 2009-09-10 | Honda Motor Co Ltd | カルコパイライト型太陽電池の製造方法 |
JP2010225829A (ja) * | 2009-03-24 | 2010-10-07 | Honda Motor Co Ltd | 薄膜太陽電池の光吸収層の形成方法 |
JP2011091249A (ja) * | 2009-10-23 | 2011-05-06 | Fujifilm Corp | 太陽電池 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017059657A (ja) * | 2015-09-16 | 2017-03-23 | 株式会社東芝 | 光電変換素子および太陽電池 |
Also Published As
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US20140224311A1 (en) | 2014-08-14 |
JP5784125B2 (ja) | 2015-09-24 |
JPWO2013031843A1 (ja) | 2015-03-23 |
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