JP2012033856A - 太陽電池及びその電極形成用導電性ペースト - Google Patents
太陽電池及びその電極形成用導電性ペースト Download PDFInfo
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- JP2012033856A JP2012033856A JP2011017782A JP2011017782A JP2012033856A JP 2012033856 A JP2012033856 A JP 2012033856A JP 2011017782 A JP2011017782 A JP 2011017782A JP 2011017782 A JP2011017782 A JP 2011017782A JP 2012033856 A JP2012033856 A JP 2012033856A
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Links
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Images
Classifications
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- H—ELECTRICITY
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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- H—ELECTRICITY
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- 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
- H01L31/02—Details
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
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- H—ELECTRICITY
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Abstract
【解決手段】結晶系シリコン太陽電池の電極形成用導電性ペーストであって、銀を含む導電性粒子、ガラスフリット、所定の添加粒子、有機バインダ及び溶剤を含み、所定の添加粒子がアルミノケイ酸塩粒子及びケイ酸アルミニウム粒子から選択される1つ以上である、導電性ペーストである。
【選択図】なし
Description
(1)アルミノケイ酸塩粒子がリチウムを含む。例えば、β−ユークリプタイト粒子のように、リチウムを含むアルミノケイ酸塩粒子を用いるならば、結晶系シリコン基板との接触抵抗が低い電極を形成することを確実にできる。
(2)アルミノケイ酸塩粒子が、β−ユークリプタイト粒子である。そのため、結晶系シリコン基板との接触抵抗が低い電極を形成することをさらに確実にできる。特に、結晶系シリコン基板のn型拡散層との接触抵抗が低い電極を形成することができる。そのため、高性能の結晶系シリコン太陽電池を得ることができる。
(3)アルミノケイ酸塩粒子の含有量が、導電性粒子100重量部に対して0.1〜5重量部である。アルミノケイ酸塩粒子の含有量が、導電性粒子100重量部に対して0.1重量部以上であることにより、結晶系シリコン基板との接触抵抗が低い電極を形成することを確実にできる。また、アルミノケイ酸塩粒子の含有量が、導電性粒子100重量部に対して5重量部であることにより、電極にはんだ付けされるインターコネクト用の金属リボンの接着強度が高い結晶系シリコン太陽電池を得ることができる。
(4)ガラスフリットがPbOを含む。アルミノケイ酸塩粒子等の所定の添加粒子と、PbOを含むガラスフリットとを含む導電性ペーストを用いる場合には、高い太陽電池性能の太陽電池を得ることができる。
(5)PbOの含有量が、ガラスフリット100重量%に対して50〜90重量%である。アルミノケイ酸塩粒子等の所定の添加粒子と、所定含有量のPbOを含むガラスフリットとを含む導電性ペーストを用いる場合には、高いインターコネクト用の金属リボンの接着強度を得ることができると共に、高い太陽電池性能の太陽電池を得ることができる。
実施例及び比較例の太陽電池製造に用いた導電性ペーストの組成は、下記のとおりである。
・導電性粒子 :Ag(100重量部)。球状、BET値が0.6m2/g、平均粒径D50が1.4μmのものを用いた。
・有機バインダ :エチルセルロース(1重量部)。エトキシ含有量48〜49.5重量%のものを用いた。
・溶剤 :ブチルカルビトールアセテート(11重量部)。
・ガラスフリット:Pb系ガラスフリット(PbO−B2O3−SiO2)(5重量部)、(平均粒径D50は2μm)、軟化点480℃。
・実施例1〜4のアルミノケイ酸塩粒子:実施例1〜4には、所定の添加粒子としてβ−ユークリプタイト粒子(LiAlSiO4、平均粒径D50は1μm)を添加した。実施例1〜4のβ−ユークリプタイト粒子の導電性ペーストへの添加量は、後述するように実験条件によって変化させて添加した。
・実施例5及び6のアルミノケイ酸塩粒子:実施例5及び6には、所定の添加粒子であるアルミノケイ酸塩粒子として、それぞれLiAlSi2O6粒子及びLiAlSi3O8粒子(平均粒径D50は1μm)を添加した。アルミノケイ酸塩粒子の導電性ペーストへの添加量は、導電性粒子100重量部に対して1重量部とした。
・実施例7のケイ酸アルミニウム粒子:実施例7には、アルミノケイ酸塩粒子の代わりに、ケイ酸アルミニウム粒子(Al2SiO5)(平均粒径D50は1μm)を添加した。ケイ酸アルミニウム粒子の導電性ペーストへの添加量は、導電性粒子100重量部に対して1重量部とした。
LiAlSiO4の原料として、Li2CO3:Al2O3:SiO2=1:1:2(モル比)を用いた。
LiAlSi2O6の原料として、Li2CO3:Al2O3:SiO2=1:1:4(モル比)を用いた。
LiAlSi3O8の原料として、Li2CO3:Al2O3:SiO2=1:1:6(モル比)を用いた。
本発明の電極形成用導電性ペーストの評価は、調製した導電性ペーストを用いて太陽電池を試作し、その特性を測定することによって行った。太陽電池の試作方法は次のとおりである。
太陽電池セルの電気的特性の測定は、次のように行った。すなわち、試作した太陽電池の電流−電圧特性を、ソーラーシミュレータ光(AM1.5、エネルギー密度100mW/cm2)の照射下で測定し、測定結果から曲線因子(FF)、変換効率(%)及び直列抵抗Rs(Ω)を算出した。なお、試料は同じ条件のものを2個作製し、測定値は2個の平均値として求めた。
はんだ付けをした金属リボンの接着強度測定用の試料は以下のように作製し測定した。まず基板として、太陽電池特性測定用と同じ、反射防止膜付き15mm角太陽電池基板を用いた。この基板表面のほぼ中央に、幅3mm、長さ12mmのはんだ付けパッドを所定の導電性ペーストを用いて印刷し、乾燥し、焼成して形成した。次に、インターコネクト用の金属リボンである銅リボン(幅1.5mm×全厚み0.16mm、共晶はんだ[スズ:鉛=64:36の重量比]を約40μmの膜厚で被覆)を、フラックスを用いてはんだ付けパッド上に250℃の温度で3秒間はんだ付けした。その後、リボンの一端に設けたリング状部をデジタル引張りゲージ(エイアンドディー社製、デジタルフォースゲージAD−4932−50N)によって基板表面に対して90度方向に引っ張り、接着の破壊強度を測定することによって接着強度の測定を行った。なお、試料は10個作製し、測定値は10個の平均値として求めた。
表1に示すように、実施例1〜4では、導電性ペーストへのβ−ユークリプタイト粒子の添加量を、導電性粒子100重量部に対し、0.0〜1.0重量部まで変化させた導電性ペーストを太陽電池の表面電極形成用に用いて太陽電池を試作した。なお、太陽電池作製の際の焼成のピーク温度は、比較例1、実施例1及び2の場合には750℃とし、比較例2、実施例3及び4の場合には775℃とした。表1に、得られた太陽電池の太陽電池特性の測定結果を示す。なお、基板と電極との間の接触抵抗が直列抵抗に与える影響は大きい。そのため、直列抵抗の値は、接触抵抗の大きさを示す指標であるといえる。直列抵抗の値が低い場合には、高い性能の太陽電池を得ることができるといえる。
表1に示すように、実施例5〜7では、導電性ペーストへの所定の添加粒子(LiAlSi2O6粒子、LiAlSi3O8粒子又はケイ酸アルミニウム粒子(Al2SiO5))の添加量を、導電性粒子100重量部に対し、1.0重量部とした導電性ペーストを太陽電池の表面電極形成用に用いて太陽電池を試作した。なお、太陽電池作製の際の焼成のピーク温度は、実施例5〜7の場合には775℃とした。表1に、得られた太陽電池の太陽電池特性の測定結果を示す。
2 反射防止膜
3 n型拡散層(n型シリコン層)
4 p型シリコン基板
5 裏面電極
Claims (8)
- 結晶系シリコン太陽電池の電極形成用導電性ペーストであって、銀を含む導電性粒子、ガラスフリット、所定の添加粒子、有機バインダ及び溶剤を含み、所定の添加粒子がアルミノケイ酸塩粒子及びケイ酸アルミニウム粒子から選択される1つ以上である、導電性ペースト。
- アルミノケイ酸塩粒子がリチウムを含む、請求項1記載の導電性ペースト。
- アルミノケイ酸塩粒子が、β−ユークリプタイト粒子である、請求項1又は2記載の導電性ペースト。
- アルミノケイ酸塩粒子の含有量が、導電性粒子100重量部に対して0.1〜5重量部である、請求項1〜3のいずれか1項記載の導電性ペースト。
- ガラスフリットがPbOを含む、請求項1〜4いずれか1項記載の導電性ペースト。
- PbOの含有量が、ガラスフリット100重量%に対して50〜90重量%である、請求項5記載の導電性ペースト。
- 請求項1〜6のいずれか1項記載の導電性ペーストを、結晶系シリコン基板のn型シリコン層上又はn型シリコン層上の反射防止膜上に印刷し、乾燥し、及び焼成することによって電極を形成する工程を含む、太陽電池の製造方法。
- 請求項7記載の製造方法によって製造される太陽電池。
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CN107431099A (zh) * | 2015-03-24 | 2017-12-01 | 株式会社钟化 | 太阳能电池用结晶硅基板的制造方法、结晶硅系太阳能电池的制造方法及结晶硅系太阳能电池模块的制造方法 |
JPWO2016152228A1 (ja) * | 2015-03-24 | 2017-12-21 | 株式会社カネカ | 太陽電池用結晶シリコン基板の製造方法、結晶シリコン系太陽電池の製造方法および結晶シリコン系太陽電池モジュールの製造方法 |
US10333012B2 (en) | 2015-03-24 | 2019-06-25 | Kaneka Corporation | Method for manufacturing crystalline silicon substrate for solar cell, method for manufacturing crystalline silicon solar cell, and method for manufacturing crystalline silicon solar cell module |
CN107431099B (zh) * | 2015-03-24 | 2019-09-03 | 株式会社钟化 | 太阳能电池用结晶硅基板的制造方法、结晶硅系太阳能电池的制造方法及结晶硅系太阳能电池模块的制造方法 |
WO2017154612A1 (ja) * | 2016-03-09 | 2017-09-14 | ナミックス株式会社 | 導電性ペースト及び太陽電池 |
JP2017162636A (ja) * | 2016-03-09 | 2017-09-14 | ナミックス株式会社 | 導電性ペースト及び太陽電池 |
JP2020181672A (ja) * | 2019-04-24 | 2020-11-05 | 京セラ株式会社 | 導電性接着用シート、導電性接着用シートの製造方法及び半導体装置 |
JP7137895B2 (ja) | 2019-04-24 | 2022-09-15 | 京セラ株式会社 | 導電性接着用シート、導電性接着用シートの製造方法及び半導体装置 |
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CN102315286B (zh) | 2015-12-16 |
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CN102315286A (zh) | 2012-01-11 |
JP5693265B2 (ja) | 2015-04-01 |
TW201202367A (en) | 2012-01-16 |
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