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JP2002299658A - Photovoltaic element - Google Patents

Photovoltaic element

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Publication number
JP2002299658A
JP2002299658A JP2001099364A JP2001099364A JP2002299658A JP 2002299658 A JP2002299658 A JP 2002299658A JP 2001099364 A JP2001099364 A JP 2001099364A JP 2001099364 A JP2001099364 A JP 2001099364A JP 2002299658 A JP2002299658 A JP 2002299658A
Authority
JP
Japan
Prior art keywords
conductive film
transparent conductive
semiconductor layer
carrier density
amorphous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001099364A
Other languages
Japanese (ja)
Inventor
Takahiro Haga
孝裕 羽賀
Takeshi Takahama
豪 高濱
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP2001099364A priority Critical patent/JP2002299658A/en
Publication of JP2002299658A publication Critical patent/JP2002299658A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Photovoltaic Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce absorption at a long wavelength in a translucent conductive film where the carrier density is less than 6×10<20> /cm<3> , and the amount of oxygen is large. SOLUTION: A photovoltaic elements has the lamination structure of a transparent conductive film 6, an amorphous or a microcrystalline conductive type semiconductor layer 4, and a crystal-family semiconductor substrate 1 from the surface of a light reception surface side at least at the light reception surface side of nearly a plate-like photovoltaic module 31. In the transparent conductive film 6, carrier density is less than 6×10<20> /cm<3> .

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、光起電力素子に関
する。
[0001] The present invention relates to a photovoltaic element.

【0002】[0002]

【従来の技術】従来の光起電力素子の構造が、例えば、
特開平9−129904号に開示されている。この構造
は、表面側より透明導電膜(ITO)/p型非晶質半導
体膜/i型非晶質半導体膜/n型結晶系半導体基板/i
型非晶質半導体膜/n型非晶質半導体膜/透明導電膜
(ITO)/裏面電極膜である。
2. Description of the Related Art The structure of a conventional photovoltaic element is, for example, as follows.
It is disclosed in JP-A-9-129904. This structure has a transparent conductive film (ITO) / p-type amorphous semiconductor film / i-type amorphous semiconductor film / n-type crystalline semiconductor substrate / i
Type amorphous semiconductor film / n-type amorphous semiconductor film / transparent conductive film (ITO) / backside electrode film.

【0003】[0003]

【発明が解決しようとする課題】上記従来の技術におい
ては、透明導電膜については、良好な導通を得るため
に、シート抵抗が小さいものを採用していた。
In the above prior art, a transparent conductive film having a small sheet resistance has been adopted in order to obtain good conduction.

【0004】本発明は、従来の構造において、透明導電
膜質を改善して、良好な特性の光起電力素子を提供する
ことを目的とする。
[0004] It is an object of the present invention to provide a photovoltaic element having good characteristics by improving the quality of a transparent conductive film in a conventional structure.

【0005】[0005]

【課題を解決するための手段】本発明の主要な構成は、
略板状の光起電力素子の少なくとも受光面側に、該面側
の表面より透明導電膜、非晶質又は微結晶の導電型半導
体層及び結晶系半導体基板の積層構造を有した光起電力
素子であって、前記透明導電膜は、キャリア密度が6×
1020/cm3未満であることを特徴とする。
The main constitution of the present invention is as follows.
A photovoltaic device having a laminated structure of a transparent conductive film, an amorphous or microcrystalline conductive semiconductor layer, and a crystalline semiconductor substrate at least on the light receiving surface side of the substantially plate-shaped photovoltaic element from the surface on the surface side. An element, wherein the transparent conductive film has a carrier density of 6 ×
It is characterized by being less than 10 20 / cm 3 .

【0006】[0006]

【発明の実施の形態】本発明の一実施例を、図面を用い
て、詳細に説明する。図1に示すように、本実施例の光
起電力素子は、100mm角程度の正方形で、厚さ約1
00〜500μmのn型の単結晶シリコン(抵抗率=約
0.5〜4Ω・cm)からなる結晶系半導体基板1を備
える。そして、結晶系半導体基板1の表面上に、プラズ
マCVD法を用いて形成された非晶質シリコンの真性半
導体層真性半導体層2(約50〜200Å)、結晶系半
導体基板1の裏面上に、プラズマCVD法を用いて形成
された非晶質シリコンの真性半導体層3(約50〜20
0Å)を備える。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the photovoltaic element of this embodiment is a square having a size of about 100 mm square and a thickness of about 1 mm.
A crystalline semiconductor substrate 1 made of n-type single crystal silicon (resistivity = about 0.5 to 4 Ω · cm) having a thickness of 00 to 500 μm is provided. Then, on the front surface of the crystalline semiconductor substrate 1, an amorphous semiconductor intrinsic semiconductor layer 2 (about 50 to 200 °) formed by using a plasma CVD method, and on the back surface of the crystalline semiconductor substrate 1, Amorphous silicon intrinsic semiconductor layer 3 (about 50 to 20) formed by a plasma CVD method.
0Å).

【0007】真性半導体層2上には、プラズマCVD法
を用いて形成されたp型非晶質シリコンの導電型半導体
層4(約50〜200Å)、真性半導体層3裏面上にプ
ラズマCVD法を用いて形成されたn型非晶質シリコン
の導電型半導体層5(約100〜500Å)を備えてい
る。
On the intrinsic semiconductor layer 2, a p-type amorphous silicon conductive semiconductor layer 4 (about 50 to 200 °) formed by using a plasma CVD method, and on the back surface of the intrinsic semiconductor layer 3, a plasma CVD method is used. The semiconductor device has an n-type amorphous silicon conductive semiconductor layer 5 (approximately 100 to 500 °).

【0008】なお、真性半導体層2、3、導電型半導体
層4、5には、非晶質シリコンを用いているが、微結晶
シリコンを用いても良い。
Although the intrinsic semiconductor layers 2 and 3 and the conductive semiconductor layers 4 and 5 are made of amorphous silicon, they may be made of microcrystalline silicon.

【0009】表面側において、導電型半導体層4上に形
成された酸化インジウム錫(=ITO)からなる透明導
電膜6、裏面側において、導電型半導体層5上に形成さ
れた酸化インジウム錫(=ITO)からなる透明導電膜
7を備えている。本実施例においては、透明導電膜6、
7の膜厚を1000Åとした。
On the front side, a transparent conductive film 6 made of indium tin oxide (= ITO) formed on the conductive type semiconductor layer 4, and on the back side, indium tin oxide (= ITO) formed on the conductive type semiconductor layer 5. A transparent conductive film 7 made of ITO) is provided. In this embodiment, the transparent conductive film 6,
The thickness of No. 7 was set to 1000 °.

【0010】更に、表面の透明導電膜6上に集電極1
0、裏面側の透明導電膜7上に集電極20を有してい
る。集電極10、20は、図2において、光起電力素子
の裏面側から見た平面図は、表面側から見た平面図(=
図2(a))と同一につき、図示していない。
Further, the collector electrode 1 is formed on the transparent conductive film 6 on the surface.
0, a collector electrode 20 is provided on the transparent conductive film 7 on the back surface side. In FIG. 2, the collector electrodes 10 and 20 are different from the plan view seen from the back side of the photovoltaic element in the plan view seen from the front side (=
It is the same as FIG.

【0011】図に示すように、集電極10、20は、銀
ペーストからなり、スクリーン印刷後加熱処理して形成
あれる。加熱処理による透明導電膜、非晶質半導体層へ
の悪影響を考慮して、加熱処理の温度が約200℃で形
成できる低温加熱処理タイプの銀ペーストを採用してい
る。
As shown in the figure, the collector electrodes 10 and 20 are made of a silver paste, and are formed by screen printing followed by heat treatment. In consideration of the adverse effect of the heat treatment on the transparent conductive film and the amorphous semiconductor layer, a low-temperature heat treatment type silver paste that can be formed at a heat treatment temperature of about 200 ° C. is used.

【0012】詳細には、集電極10、20は、側辺と平
行に延びる2本のバス電極部11、21(幅約2mm)
と、このバス電極部11、21より直交して延びる複数
のフィンガー電極部12、22(幅約50μm、間隔約
2〜3mm)とからなる。
More specifically, the collecting electrodes 10 and 20 are composed of two bus electrode portions 11 and 21 (width about 2 mm) extending parallel to the side.
And a plurality of finger electrode portions 12 and 22 (width of about 50 μm, spacing of about 2 to 3 mm) extending orthogonally from the bus electrode portions 11 and 21.

【0013】このような構造の太陽電池素子の分光感度
スペクトルは、特許第2614561号の図2に開示が
あるように、400〜1100nmに渡り幅広い分光感
度特性を有している。それゆえ、透明導電膜について
は、可視光(約400〜650nm)の透過性のみなら
ず、約650〜1100nmの赤外線に対する透過性が
大きいことも重要である。
The spectral sensitivity spectrum of the solar cell element having such a structure has a wide spectral sensitivity characteristic over a range of 400 to 1100 nm as disclosed in FIG. 2 of Japanese Patent No. 2614561. Therefore, it is important that the transparent conductive film not only has high transmittance for visible light (about 400 to 650 nm) but also has high transmittance for infrared rays of about 650 to 1100 nm.

【0014】図3は、透明導電膜(ITO)の吸収率の
分光特性を示している。曲線Aが、従来であり、キャリ
ア密度6×1020/cm3、低抵抗な1000Åで30
Ω/□の透明導電膜を示している。600nm以上の波
長において、吸収が大きいことが理解できる。なお、こ
の従来の透明導電膜は、キャリア密度6×1020/cm
3、抵抗率が3.0×10-4Ω・cmであった。
FIG. 3 shows the spectral characteristics of the absorptance of the transparent conductive film (ITO). Curve A shows a conventional curve having a carrier density of 6 × 10 20 / cm 3 and a low resistance of 30 ° at 1000 °.
The transparent conductive film of Ω / □ is shown. It can be understood that absorption is large at a wavelength of 600 nm or more. This conventional transparent conductive film has a carrier density of 6 × 10 20 / cm.
3. The resistivity was 3.0 × 10 −4 Ω · cm.

【0015】本実施例においては、長波長の600nm
以上の波長において吸収が少ない透明導電膜を得ること
ができた。その分光感度特性を、曲線B(テスト1)に
示す。特に、800nm以上の波長において、吸収が小
さい。なお、曲線Bの透明導電膜は、キャリア密度4×
1020/cm3、抵抗率が3.5×10-4Ω・cm(1
000Åで35Ω/□)であった。
In this embodiment, a long wavelength of 600 nm
A transparent conductive film having little absorption at the above wavelengths was obtained. The spectral sensitivity characteristics are shown in a curve B (test 1). In particular, absorption is small at a wavelength of 800 nm or more. Note that the transparent conductive film of curve B has a carrier density of 4 ×
10 20 / cm 3 and resistivity of 3.5 × 10 −4 Ω · cm (1
35Ω / □ at 000 °).

【0016】また、同様に、本実施例である曲線C(テ
スト2)においても、長波長の600nm以上の波長に
おいて吸収が少ない透明導電膜を得ることができた。な
お、曲線Cの透明導電膜は、キャリア密度2×1020
cm3、抵抗率が4.0×10-4Ω・cm(1000Å
で40Ω/□)であった。
Similarly, in the curve C (test 2) of the present embodiment, a transparent conductive film having little absorption at a long wavelength of 600 nm or more was obtained. The transparent conductive film of the curve C has a carrier density of 2 × 10 20 /
cm 3 and a resistivity of 4.0 × 10 −4 Ω · cm (1000 °
40Ω / □).

【0017】このような図3における曲線B、Cの分光
感度特性を有する透明導電膜は、膜中の酸素量を増加さ
せることにより達成できることが確認できた。詳細に
は、本実施例の透明導電膜は、ITOターゲット(In
23とSnO2との混合)を用いて、Arガス及び酸素
ガスを導入してスパッタ成膜を行い、成膜中のO2ガス
の流量を増加させることにより、透明導電膜中の酸素量
を増加させることができた。具体的には、スパッタ成膜
中の酸素ガス流量を、2.0SCCM(従来、曲線
A)、4SCCM(テスト1、曲線B)、7SCCM
(テスト2、曲線C)とすることで、透明導電膜中の酸
素量を増加させた。酸素量が多いと、長波長での吸収を
抑えることができるものの、透明導電膜中の酸素欠損が
なくなり、電気伝導が悪くなり、抵抗値が上昇する。こ
のことは、上記の透明導電膜の物性の比較でも確認でき
る。透明導電膜中の酸素量は、キャリア密度を指標とす
ることができ、酸素量が増加すると、キャリア密度が減
少する。
It has been confirmed that such a transparent conductive film having the spectral sensitivity characteristics of curves B and C in FIG. 3 can be achieved by increasing the amount of oxygen in the film. Specifically, the transparent conductive film of the present embodiment is made of an ITO target (In
(Mixture of 2 O 3 and SnO 2 ) by introducing Ar gas and oxygen gas to form a film by sputtering, and by increasing the flow rate of O 2 gas during the film formation, the oxygen in the transparent conductive film is increased. The amount could be increased. Specifically, the oxygen gas flow rate during sputtering film formation was set to 2.0 SCCM (conventional, curve A), 4 SCCM (test 1, curve B), 7 SCCM
(Test 2, curve C) increased the amount of oxygen in the transparent conductive film. When the amount of oxygen is large, although absorption at a long wavelength can be suppressed, oxygen deficiency in the transparent conductive film is eliminated, electric conductivity is deteriorated, and resistance value is increased. This can be confirmed by comparing the physical properties of the transparent conductive film. The amount of oxygen in the transparent conductive film can be determined using the carrier density as an index. As the amount of oxygen increases, the carrier density decreases.

【0018】そして、本実施例の透明導電膜において、
酸素量を増加させることにより、抵抗値は上昇するもの
の、約600nm以上での吸収を抑え、光起電力素子の
出力を増加させることができた。表1に、このような透
明導電膜を図2の構造に採用した場合の特性比較を示
す。
Then, in the transparent conductive film of this embodiment,
By increasing the amount of oxygen, although the resistance value increased, absorption at about 600 nm or more was suppressed, and the output of the photovoltaic element was able to be increased. Table 1 shows a comparison of characteristics when such a transparent conductive film is employed in the structure of FIG.

【0019】[0019]

【表1】 [Table 1]

【0020】表1より、本実施例のテスト1、2におい
ては、従来と比較して、透明導電膜中の酸素量を増加さ
せたことにより(キャリア密度は低下する)、抵抗率が
大きいものの(FFが低下する)、長波長での吸収を低
下させることができるので、Iscを増加し、トータル
の出力であるPmaxが向上している。
From Table 1, it can be seen that in Tests 1 and 2 of this embodiment, although the resistivity was large due to the increase in the amount of oxygen in the transparent conductive film (the carrier density was reduced) as compared with the conventional test, (The FF is reduced.) Since the absorption at a long wavelength can be reduced, Isc is increased, and Pmax, which is the total output, is improved.

【0021】本実施例においては、改良された透明導電
膜を、光起電力素子の表面、裏面に用いたが、入射面で
ある表面に利用するだけでも、十分な特性向上がある。
In this embodiment, the improved transparent conductive film is used on the front and back surfaces of the photovoltaic element. However, even if it is used only on the front surface which is the incident surface, the characteristics are sufficiently improved.

【0022】[0022]

【発明の効果】本発明においては、略板状の光起電力素
子の少なくとも受光面側に、該面側の表面より透明導電
膜、非晶質又は微結晶の導電型半導体層及び結晶系半導
体基板の積層構造を有した光起電力素子において、透明
導電膜は、キャリア密度が6×1020/cm3未満であ
って、酸素量が多いことより、長波長での吸収を低下さ
せることができる。
According to the present invention, a transparent conductive film, an amorphous or microcrystalline conductive semiconductor layer, and a crystalline semiconductor are formed on at least the light receiving surface side of a substantially plate-shaped photovoltaic element from the surface side. In a photovoltaic device having a laminated structure of substrates, the transparent conductive film has a carrier density of less than 6 × 10 20 / cm 3 and has a large amount of oxygen, so that absorption at a long wavelength can be reduced. it can.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の製造途中の光起電力素子を示す図であ
り、(a)は平面図、(b)は(a)におけるA−A断
面図である。
FIGS. 1A and 1B are diagrams showing a photovoltaic element in the process of manufacturing according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG.

【図2】本発明の光起電力素子を示す図であり、(a)
は平面図、(b)は(a)におけるA−A拡大断面図、
(c)は(a)におけるB−B拡大断面図である。
FIG. 2 is a diagram showing a photovoltaic device of the present invention, wherein (a)
Is a plan view, (b) is an AA enlarged sectional view in (a),
(C) is an BB enlarged sectional view in (a).

【図3】分光特性のグラフを示す。FIG. 3 shows a graph of spectral characteristics.

【符号の説明】[Explanation of symbols]

1 結晶系半導体基板 2、3 真性非晶質半導体層 4、5 導電型非晶質半導体層 6、7 透明導電膜 10、20 集電極 11、21 バス電極部 12、22 フィンガー電極部 REFERENCE SIGNS LIST 1 crystal-based semiconductor substrate 2, 3 intrinsic amorphous semiconductor layer 4, 5 conductive-type amorphous semiconductor layer 6, 7 transparent conductive film 10, 20 collector electrode 11, 21 bus electrode part 12, 22 finger electrode part

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5F051 AA02 AA04 AA05 BA16 CA15 CB15 CB27 DA20 FA04 FA10 FA14 GA04  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5F051 AA02 AA04 AA05 BA16 CA15 CB15 CB27 DA20 FA04 FA10 FA14 GA04

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 略板状の光起電力素子の少なくとも受光
面側に、該面側の表面より透明導電膜、非晶質又は微結
晶の導電型半導体層及び結晶系半導体基板の積層構造を
有した光起電力素子であって、 前記透明導電膜は、キャリア密度が6×1020/cm3
未満であることを特徴とする光起電力素子。
1. A laminated structure of a transparent conductive film, an amorphous or microcrystalline conductive semiconductor layer, and a crystalline semiconductor substrate on at least a light receiving surface side of a substantially plate-shaped photovoltaic element from the surface side. The transparent conductive film has a carrier density of 6 × 10 20 / cm 3.
A photovoltaic element, wherein
【請求項2】 結晶系半導体基板の表面上に、非晶質又
は微結晶の一導電型半導体層及び透明導電膜を積層し、
前記基板の裏面上に、非晶質又は微結晶の他導電型半導
体層を積層した光起電力素子であって、 前記透明導電膜は、キャリア密度が6×1020/cm3
未満であることを特徴とする光起電力素子。
2. An amorphous or microcrystalline one conductivity type semiconductor layer and a transparent conductive film are laminated on a surface of a crystalline semiconductor substrate,
A photovoltaic device in which an amorphous or microcrystalline other conductive semiconductor layer is laminated on a back surface of the substrate, wherein the transparent conductive film has a carrier density of 6 × 10 20 / cm 3.
A photovoltaic element, wherein
【請求項3】 前記半導体基板と、前記半導体層の間
に、非晶質又は微結晶からなる真性半導体層を介在した
ことを特徴とする請求項1又は2の光起電力素子。
3. The photovoltaic device according to claim 1, wherein an intrinsic semiconductor layer made of amorphous or microcrystalline is interposed between said semiconductor substrate and said semiconductor layer.
【請求項4】 前記透明導電膜は、酸化インジウム錫で
あることを特徴とする請求項1又は2の光起電力素子。
4. The photovoltaic device according to claim 1, wherein the transparent conductive film is made of indium tin oxide.
【請求項5】 前記透明導電膜は、キャリア密度が4×
1020/cm3以下であることを特徴とする請求項1又
は2の光起電力素子。
5. The transparent conductive film has a carrier density of 4 ×.
The photovoltaic device according to claim 1, wherein the photovoltaic device has a density of 10 20 / cm 3 or less.
【請求項6】 前記透明導電膜は、抵抗率が3.5×1
-4Ω・cm以上であることを特徴とする請求項1又は
2の光起電力素子。
6. The transparent conductive film has a resistivity of 3.5 × 1.
The photovoltaic device according to claim 1, wherein the photovoltaic device has a resistivity of 0 −4 Ω · cm or more.
JP2001099364A 2001-03-30 2001-03-30 Photovoltaic element Pending JP2002299658A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
US7501305B2 (en) 2006-10-23 2009-03-10 Canon Kabushiki Kaisha Method for forming deposited film and photovoltaic element
WO2012020682A1 (en) * 2010-08-09 2012-02-16 株式会社カネカ Crystalline silicon solar cell
WO2012050186A1 (en) * 2010-10-14 2012-04-19 株式会社カネカ Method of producing crystalline silicon-based photovoltaic cell
JP2015516692A (en) * 2012-05-16 2015-06-11 ロス・ウント・ラウ・アーゲー Heterocontact solar cell and method of manufacturing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7501305B2 (en) 2006-10-23 2009-03-10 Canon Kabushiki Kaisha Method for forming deposited film and photovoltaic element
WO2012020682A1 (en) * 2010-08-09 2012-02-16 株式会社カネカ Crystalline silicon solar cell
JPWO2012020682A1 (en) * 2010-08-09 2013-10-28 株式会社カネカ Crystalline silicon solar cell
WO2012050186A1 (en) * 2010-10-14 2012-04-19 株式会社カネカ Method of producing crystalline silicon-based photovoltaic cell
JPWO2012050186A1 (en) * 2010-10-14 2014-02-24 株式会社カネカ Method for manufacturing crystalline silicon solar cell
US9276163B2 (en) 2010-10-14 2016-03-01 Kaneka Corporation Method for manufacturing silicon-based solar cell
JP2015516692A (en) * 2012-05-16 2015-06-11 ロス・ウント・ラウ・アーゲー Heterocontact solar cell and method of manufacturing the same

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