JP5527292B2 - 太陽電池セルの接続方法 - Google Patents
太陽電池セルの接続方法 Download PDFInfo
- Publication number
- JP5527292B2 JP5527292B2 JP2011180849A JP2011180849A JP5527292B2 JP 5527292 B2 JP5527292 B2 JP 5527292B2 JP 2011180849 A JP2011180849 A JP 2011180849A JP 2011180849 A JP2011180849 A JP 2011180849A JP 5527292 B2 JP5527292 B2 JP 5527292B2
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- JP
- Japan
- Prior art keywords
- adhesive layer
- metal foil
- conductor
- electrode
- adhesive
- 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.)
- Expired - Fee Related
Links
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Images
Classifications
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- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0512—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module made of a particular material or composition of materials
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
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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
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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
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Landscapes
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
- Photovoltaic Devices (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Non-Insulated Conductors (AREA)
Description
0.8≦t/Rz≦1.5 …(1)
式(1)中、tは、接着前の接着剤層の厚み(μm)を示し、Rzは、導電体の接着剤層と接する面の十点平均粗さ(μm)を示す。
0.8≦t/Rz≦1.5 …(1)
式(1)中、tは、接着前の接着剤層の厚み(μm)を示し、Rzは、導電体の接着剤層と接する面の十点平均粗さ(μm)を示す。
(a)第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、最大高さRy1以下であり、かつ、最大高さRy2以下である。
(b)第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、最大高さRy1以下であり、かつ、第2の接着剤層に含まれる導電粒子の最大粒径r2max(μm)が、最大高さRy2以下である。
ここで、式中、nは、最大径がdなる粒子の数を示す。粒径の測定方法としては、一般的に用いられる電子顕微鏡や光学顕微鏡、コールターカウンター、光散乱法などが挙げられる。なお、粒子がアスペクト比を有する場合、dは中心径を採用する。また、本発明においては、電子顕微鏡により最低10個以上の粒子について測定することが好ましい。
0.8≦t/Rz≦1.5 …(1)
式(1)中、tは、接着剤層の厚み(μm)を示し、Rzは、導電体の接着剤層と接する面の十点平均粗さ(μm)を示す。
0.6≦t/Ry≦1.3 …(2)
式(2)中、tは、接着剤層の厚み(μm)を示し、Ryは、導電体の接着剤層と接する面の最大高さ(μm)を示す。
0.8≦t/Rz≦1.5 …(1)
式(1)中、tは、接着剤層の厚み(μm)を示し、Rzは、導電体の接着剤層と接する面の十点平均粗さ(μm)を示す。
0.6≦t/Ry≦1.3 …(2)
式(2)中、tは、接着剤層の厚み(μm)を示し、Ryは、導電体の接着剤層と接する面の最大高さ(μm)を示す。
(a)第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、最大高さRy1以下であり、かつ、最大高さRy2以下である。
(b)第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、最大高さRy1以下であり、かつ、第2の接着剤層に含まれる導電粒子の最大粒径r2max(μm)が、最大高さRy2以下である。
(1)接着剤付き金属箔テープ(導電体接続用部材)の作製
フィルム形成材としてのフェノキシ樹脂(Inchem社製、商品名「PKHA、分子量25000の高分子量エポキシ樹脂)50g、及びエポキシ樹脂(日本化薬株式会社製、商品名「EPPN」)20gを、酢酸エチル175gに溶解し、溶液を得た。次いで、潜在性硬化剤としてイミダゾール系マイクロカプセルを液状エポキシ樹脂に分散したマスターバッチ型硬化剤(旭化成化成工業株式会社製、商品名「ノバキュア」、平均粒子径2μm)5gを上記溶液に添加し、固形分30質量%の接着剤層形成用塗布液を得た。なお、この塗布液の活性温度は120℃であった。
シリコンウエハの表面上に、銀ガラスペーストから形成される表面電極(幅2mm×長さ15cm、Rz:18μm、Ry:20μm)を設けた太陽電池セル(厚さ:150μm、大きさ15cm×15cm)を準備した。
接着剤層の厚みを14μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
接着剤層の厚みを22μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
接着剤層形成用塗布液に粒径分布幅が1〜12μm(平均粒径:7μm)の毬栗状のNi粉を2体積%添加したこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。なお、添加した導電粒子は粒径の均一化処理が行われていないものであり、上記のように広い粒径分布を有するものである。
接着剤層の厚みを5μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、太陽電池セルとして、シリコンウエハの表面上に、銀ガラスペーストから形成される表面電極(幅2mm×長さ15cm、Rz:5μm、Ry:6μm)を設けた太陽電池セル(厚さ:150μm、大きさ15cm×15cm)を用いたこと以外は実施例1と同様にして、接続構造を得た。
接着剤層の厚みを30μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、太陽電池セルとして、シリコンウエハの表面上に、銀ガラスペーストから形成される表面電極(幅2mm×長さ15cm、Rz:30μm、Ry:34μm)を設けた太陽電池セル(厚さ:150μm、大きさ15cm×15cm)を用いたこと以外は実施例1と同様にして、接続構造を得た。
金属箔として厚み100μmの平滑銅箔を用い、接着剤層の厚みを20μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
金属箔として厚み20μmのアルミ箔(Rz:0.1μm、Ry:0.2μm)を用い、接着剤層の厚みを20μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
接着剤層の厚みを9μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
接着剤層の厚みを45μmにしたこと以外は実施例1と同様にして、接着剤付き金属箔テープを得た。次に、この接着剤付き金属箔テープを用い、実施例1と同様にして接続構造を得た。
上記実施例1〜8及び参考例1〜2の接続構造について、導電性、充填性を下記のようにして評価し、また、上記実施例1〜8の接続構造について、deltaF.F.を下記のようにして評価した。結果を表1に示す。
得られた接続体について、テープの金属箔とセル電極との間の抵抗を簡易的に測定した。抵抗が10−1Ω/cm2以下の場合を導電性ありとし、「○」で示し、10−1Ω/cm2を超える場合を「×」として示した。
得られた接続体について、接続部の全体的な観察から接着剤のはみ出し度を観察した。接着剤のはみ出しが見られる場合を接着剤の充填性ありとし、「○」で示し、接着剤のはみ出しが見られなかった場合を接着剤の充填性なしとし、「×」として評価した。
得られた接続構造のIV曲線を、ソーラシミュレータ(ワコム電創社製、商品名「WXS−155S−10」、AM:1.5G)を用いて測定した。また、接続構造を85℃、85%RHの高温高湿雰囲気下で1500時間静置した後、同様にIV曲線を測定した。それぞれのIV曲線からF.Fを各々導出し、高温高湿雰囲気下に静置する前のF.Fから、高温高湿条件下に静置した後のF.F.を除した値である[F.F.(0h)−F.F.(1500h)]をDelta(F.F.)とし、これを評価指標として用いた。なお、一般にDelta(F.F.)の値が0.2以下となると接続信頼性が良好であると判断される。
Claims (6)
- 互いに離れている太陽電池セルの電極と別の太陽電池セルの電極とを電気的に接続する方法であって、
金属箔、該金属箔の一方の面に設けられた第1の接着剤層、及び前記太陽電池セルの電極を、この順に配した状態で加熱加圧して、前記金属箔と前記太陽電池セルの電極とを電気的に接続するとともに接着し、前記金属箔、前記第1の接着剤層若しくは前記金属箔の他方の面に設けられた第2の接着剤層、及び前記別の太陽電池セルの電極を、この順に配した状態で加熱加圧して、前記金属箔と前記別の太陽電池セルの電極とを電気的に接続するとともに接着する工程を備え、
前記第1の接着剤層の厚み、又は、前記第1の接着剤層及び前記第2の接着剤層の厚みが、下記式(1)の条件を満たす、太陽電池セルの接続方法。
0.8≦t/Rz≦1.5 …(1)
[式(1)中、tは、接着前の接着剤層の厚み(μm)を示し、Rzは、電極の接着剤層と接する面の十点平均粗さ(μm)を示す。] - 前記太陽電池セルの電極の前記金属箔と接する面の十点平均粗さRz1(μm)及び前記別の太陽電池セルの電極の前記金属箔と接する面の十点平均粗さRz2(μm)が、2μm以上30μm以下である、請求項1に記載の太陽電池セルの接続方法。
- 前記第1の接着剤層、又は、前記第1の接着剤層及び前記第2の接着剤層が、熱硬化性樹脂及び潜在性硬化剤を含む、請求項1又は2に記載の太陽電池セルの接続方法。
- 前記第1の接着剤層、又は、前記第1の接着剤層及び前記第2の接着剤層が、導電粒子を含み、
前記太陽電池セルの電極の前記第1の接着剤層と接する面の最大高さをRy1(μm)、前記別の太陽電池セルの前記第1の接着剤層若しくは前記第2の接着剤層と接する面の最大高さをRy2(μm)としたときに、下記(a)又は(b)の条件を満たす、請求項1〜3のいずれか一項に記載の太陽電池セルの接続方法。
(a)前記第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、前記最大高さRy1以下であり、かつ、前記最大高さRy2以下である。
(b)前記第1の接着剤層に含まれる導電粒子の最大粒径r1max(μm)が、前記最大高さRy1以下であり、かつ、前記第2の接着剤層に含まれる導電粒子の最大粒径r2max(μm)が、前記最大高さRy2以下である。 - 前記金属箔が、Cu、Ag、Au、Fe、Ni、Pb、Zn、Co、Ti、Mg、Sn及びAlから選ばれる1つ以上の金属を含むものである、請求項1〜4のいずれか一項に記載の太陽電池セルの接続方法。
- 太陽電池セル同士を、請求項1〜5のいずれか一項に記載の接続方法によって接続することを特徴とする、太陽電池モジュールの製造方法。
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CN105826418A (zh) | 2016-08-03 |
WO2008139995A1 (ja) | 2008-11-20 |
CN105826418B (zh) | 2017-05-17 |
CN101669258B (zh) | 2016-04-13 |
US20130220540A1 (en) | 2013-08-29 |
JP4894920B2 (ja) | 2012-03-14 |
JPWO2008139995A1 (ja) | 2010-08-05 |
TW200919750A (en) | 2009-05-01 |
JP2012009884A (ja) | 2012-01-12 |
TWI449186B (zh) | 2014-08-11 |
KR20090098871A (ko) | 2009-09-17 |
KR101248636B1 (ko) | 2013-04-01 |
CN101669258A (zh) | 2010-03-10 |
US20100108141A1 (en) | 2010-05-06 |
US9660131B2 (en) | 2017-05-23 |
EP2146404A1 (en) | 2010-01-20 |
KR20110082604A (ko) | 2011-07-19 |
KR101081706B1 (ko) | 2011-11-09 |
US10032952B2 (en) | 2018-07-24 |
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