JP5998178B2 - 太陽電池受光面電極用ペースト、その製造方法、および太陽電池セルの製造方法 - Google Patents
太陽電池受光面電極用ペースト、その製造方法、および太陽電池セルの製造方法 Download PDFInfo
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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
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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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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- 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
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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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Description
また、鉛含有添加物は一部または全部が前記ガラスフリットに担持されていることから、導電性粉末等と共にガラスに混合される場合に比較して、部分的にPbとTeが共に作用する効果が一層顕著に得られ、電気的特性が一層高められる。なお、鉛含有添加物の全部をガラスフリットに担持してもよいが、一部を担持させて鉛含有添加物を酸化物として残存させ、電極ペースト中に鉛含有添加物が存在する状態とすれば、ファイヤースルーの際に、鉛含有添加物が含まれることによる侵食性のばらつきが一層顕著に現れるため、電気的特性および接着強度の兼ね合いが一層好ましい電極を形成することができる。
なお、本願において、「鉛含有添加物」は、単体の鉛または鉛化合物を意味する。また、高融点金属含有添加物は、高融点金属の単体または化合物であり、化合物としては、酸化物の他、オキソ酸、オキソ酸のアンモニウム塩或いは酢酸塩等が挙げられる。また、「ガラスとは別に添加」とは、上記説明から明らかなようにガラス中にその成分として含まれるのではなく、単体や別の化合物として添加されることを意味する。例えば、鉛含有添加物について上述したように、ガラスフリットに担持する態様も「ガラスとは別に添加」である。
Claims (14)
- 導電性粉末と、無鉛テルルガラスから成るガラスフリットと、ベヒクルとを含み、シリコン基板の一面上に塗布して焼成処理を施すことにより太陽電池の受光面電極をファイヤースルーによって形成するために用いられる太陽電池受光面電極用ペーストであって、
タングステン、モリブデン、およびクロムのうちの少なくとも1種の高融点金属と、
一部または全部が前記ガラスフリットに担持されている状態で前記無鉛テルルガラスとは別に添加された鉛含有添加物と
を、含むことを特徴とする太陽電池受光面電極用ペースト。 - 前記高融点金属は、それらのうちの少なくとも1種を含む高融点金属含有添加物として前記無鉛テルルガラスとは別に添加されたものである請求項1の太陽電池受光面電極用ペースト。
- 前記高融点金属含有添加物は、一部または全部が前記ガラスフリットに担持されているものである請求項1または請求項2の太陽電池受光面電極用ペースト。
- 前記鉛含有添加物は、一部が酸化物として残存するものである請求項1乃至請求項3の何れか1項に記載の太陽電池受光面電極用ペースト。
- 前記鉛含有添加物は、酸化物換算したPbO/ガラスフリット重量比で0.5〜1.0の範囲内の割合で含まれるものである請求項1乃至請求項4の何れか1項に記載の太陽電池受光面電極用ペースト。
- 前記高融点金属は、それぞれ酸化物換算した値で、ガラスフリットのWO3、MoO3、Cr2O3以外の成分の合計質量Gに対して、(WO3/G)+2(MoO3/G)+4Cr2O3/Gが0.04〜0.40の範囲内の割合で少なくとも1種が含まれるものである請求項1乃至請求項5の何れか1項に記載の太陽電池受光面電極用ペースト。
- 前記無鉛テルルガラスは、酸化物換算で54〜80(mol%)のTeO2と、0.4〜18(mol%)のLi2Oとを含むものである請求項1乃至請求項6の何れか1項に記載の太陽電池受光面電極用ペースト。
- 前記無鉛テルルガラスは、酸化物換算で25(mol%)以下のBi2O3と、5(mol%)以下のCuOと、20(mol%)以下のSiO2とを含むものである請求項1乃至請求項7の何れか1項に記載の太陽電池受光面電極用ペースト。
- タングステン、モリブデン、およびクロムのうちの少なくとも1種の高融点金属を含む無鉛テルルガラスから成るガラスフリットに鉛含有添加物の一部または全部を担持させる鉛含有添加物担持工程と、
導電性粉末と、前記ガラスフリットと、前記鉛含有添加物と、ベヒクルとを混合する混合工程と
を、含むことを特徴とする太陽電池受光面電極用ペーストの製造方法。 - 前記鉛含有添加物担持工程は、前記ガラスフリットと前記鉛含有添加物の粉末とを混合して酸化雰囲気中において500(℃)以下の温度で仮焼処理を施すものである請求項9の太陽電池受光面電極用ペーストの製造方法。
- 無鉛テルルガラスから成るガラスフリットにタングステン、モリブデン、およびクロムのうちの少なくとも1種の高融点金属含有添加物の一部または全部を担持させる高融点金属含有添加物担持工程と、
導電性粉末と、前記ガラスフリットと、前記高融点金属含有添加物と、鉛含有添加物と、ベヒクルとを混合する混合工程と
を、含むことを特徴とする太陽電池受光面電極用ペーストの製造方法。 - 前記鉛含有添加物の一部または全部を前記ガラスフリットに担持させる鉛含有添加物担持工程を含むものである請求項11の太陽電池受光面電極用ペーストの製造方法。
- 前記鉛含有添加物担持工程は、前記ガラスフリットと前記鉛含有添加物の粉末とを混合して酸化雰囲気中において500(℃)以下の温度で仮焼処理を施すものである請求項12の太陽電池受光面電極用ペーストの製造方法。
- p型シリコン基板の一面に形成されたn+層上に反射防止膜を備え且つファイヤースルーによって受光面電極が設けられた太陽電池セルの製造方法であって、
前記受光面電極を、前記請求項1乃至請求項8の何れか1項に記載の太陽電池受光面電極用ペーストから生成することを特徴とする太陽電池セルの製造方法。
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