JP2012089829A - 半導体上からホットメルトエッチングレジストを剥離する改良された方法 - Google Patents
半導体上からホットメルトエッチングレジストを剥離する改良された方法 Download PDFInfo
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- JP2012089829A JP2012089829A JP2011204197A JP2011204197A JP2012089829A JP 2012089829 A JP2012089829 A JP 2012089829A JP 2011204197 A JP2011204197 A JP 2011204197A JP 2011204197 A JP2011204197 A JP 2011204197A JP 2012089829 A JP2012089829 A JP 2012089829A
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Abstract
【解決手段】ホットメルトエッチングレジストが、半導体ウェハ上の反射防止コーティングもしくは選択的エミッタに選択的に適用される。無機酸含有エッチング剤を用いて、反射防止コーティングおよび選択的エミッタの露出部分がエッチング除去されて、半導体基体を露出させる。このホットメルトエッチングレジストは次いで、半導体の電気的一体性を悪化させないアルカリ剥離剤を用いて半導体から剥離される。次いで、露出した半導体は金属化されて、電流トラックを形成する。
【選択図】なし
Description
本発明はアルカリ剥離剤で半導体からホットメルトエッチングレジストを剥離する改良された方法に関する。より具体的には、本発明は半導体の電気的一体性を悪化させないアルカリ剥離剤で半導体からホットメルトエッチングレジストを剥離する改良された方法に関する。
方法はa)PN接合を有する半導体基体であって、PN接合を有する半導体基体の前面上に選択的エミッタをおよび裏面上にアルミニウム含有電極を含む半導体基体を提供し;b)前記PN接合を有する半導体基体上の選択的エミッタにホットメルトエッチングレジストを選択的に適用し;c)前記PN接合を有する選択的エミッタの露出部分にエッチング剤を適用して、前記露出部分をエッチングし;並びにd)炭酸カリウムおよびケイ酸カリウムを含む剥離剤を前記PN接合を有する半導体基体に適用して、選択的エミッタからホットメルトエッチングレジスト除去する;ことも含む。
以下の表に開示される配合を有するホットメルトインクジェットレジストが準備された。
2UVITEX OB商標:蛍光増白剤。
PN接合を伴う3枚の単結晶シリコンウェハが選択的に印刷されて、上記実施例1のホットメルトエッチングレジストで「H」パターンを形成した。このホットメルトエッチングレジストは実施例1に記載される装置で印刷された。次いで、印刷されたレジストは室温まで冷却されて硬化された。
従来のスクリーン印刷アルミニウムペーストから製造された裏面上のアルミニウム電極およびPN接合を伴う、深いエミッタ(250〜300nmより深い)単結晶シリコンウェハがMetler ToledoからのSartorius分析天秤上で秤量された。これは炭酸カリウムの10g/L溶液中に浸漬された。この炭酸カリウム溶液は11のpHを有しており、温度は70℃であった。
ウェハはこの溶液中に10分間攪拌しつつ浸漬された。浸漬中に、炭酸カリウムがアルミニウム電極を腐蝕していたことを示す、アルミニウム電極において形成される水素ガスの泡が観察された。ウェハはこの溶液から取り出されて水ですすがれ、空気乾燥され、秤量された。ウェハの重量は0.2重量%減っていた。この重量損失は、アルミニウム電極が炭酸カリウム溶液によってなされたことをさらに示す。
従来のスクリーン印刷アルミニウムペーストから製造された裏面上のアルミニウム電極およびPN接合を伴う、深いエミッタ単結晶シリコンウェハが、炭酸カリウムの10g/L、およびケイ酸カリウム1g/L、pH11の水溶液中に10分間、70℃の温度で、攪拌しつつ浸漬された。アルミニウム電極からの観察可能な泡の発生はなかった。ケイ酸カリウムの添加は、アルミニウム電極の炭酸カリウムによる腐蝕を抑制した。この溶液を室温まで冷却したときに、この溶液は流動可能かつ透明なままであった。この溶液の観察可能なゲル化はなかった。
Direct Mask商標DoD300インクジェットプリンターを用いて、PN接合を伴う深いエミッタ単結晶シリコンウェハが、上記実施例1に記載されるホットメルトレジストで選択的にコーティングされた。このシリコンウェハはその裏面上にアルミニウム電極も含んでいた。このアルミニウム電極は焼かれた従来のアルミニウムペーストから製造された。次いで、このウェハは水酸化カリウムの5g/L溶液中に浸漬された。この水酸化カリウムの溶液は13のpHを有しており、温度は40℃であった。水酸化カリウム中で3分後に、アルミニウム電極から発生する泡が観察された。これは水酸化カリウムによるアルミニウム電極に対する腐食作用を示した。
Claims (9)
- a)PN接合を有する半導体基体であって、PN接合を有する半導体基体の前面上に反射防止コーティングをおよび裏面上にアルミニウム含有電極を含む半導体基体を提供し;
b)前記PN接合を有する半導体基体上の反射防止コーティングにホットメルトエッチングレジストを選択的に適用し;
c)前記PN接合を有する半導体基体の反射防止コーティングの露出部分にエッチング剤を適用し、反射防止コーティングの露出部分を除去して、PN接合を有する半導体基体の前面を選択的に露出させ;並びに
d)炭酸カリウムおよびケイ酸カリウムを含む剥離剤を前記PN接合を有する半導体基体に適用して、反射防止コーティングからホットメルトエッチングレジスト除去する;
ことを含む方法。 - 前記PN接合を有する半導体基体の選択的に露出した前面上に金属を堆積させて、電流トラックを形成する工程をさらに含む、請求項1に記載の方法。
- 剥離剤が1種以上の消泡剤をさらに含む請求項1に記載の方法。
- 剥離剤組成物のpHが8〜12の範囲である請求項1に記載の方法。
- 剥離剤の温度が室温〜70℃の範囲である請求項1に記載の方法。
- 前記ホットメルトレジストが1種以上のワックスおよび1種以上の水素化ロジン樹脂を含む請求項1に記載の方法。
- 炭酸カリウム、ケイ酸カリウムおよび水から本質的になる剥離剤組成物。
- 1種以上の消泡剤をさらに含む請求項8に記載の剥離剤組成物。
- a)PN接合を有する半導体基体であって、PN接合を有する半導体基体の前面上に選択的エミッタをおよび裏面上にアルミニウム含有電極を含む半導体基体を提供し;
b)前記PN接合を有する半導体基体上の選択的エミッタにホットメルトエッチングレジストを選択的に適用し;
c)前記PN接合を有する選択的エミッタの露出部分にエッチング剤を適用して、前記露出部分をエッチングし;並びに
d)炭酸カリウムおよびケイ酸カリウムを含む剥離剤を前記PN接合を有する半導体基体に適用して、選択的エミッタからホットメルトエッチングレジスト除去する;
ことを含む方法。
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JP7365430B2 (ja) | 2019-12-19 | 2023-10-19 | 株式会社カネカ | 太陽電池の製造方法 |
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SG179379A1 (en) | 2012-04-27 |
EP2432035A3 (en) | 2013-01-02 |
TW201229552A (en) | 2012-07-16 |
JP5830323B2 (ja) | 2015-12-09 |
KR101739835B1 (ko) | 2017-05-25 |
CN102569017B (zh) | 2016-02-10 |
KR20120044238A (ko) | 2012-05-07 |
EP2432035B1 (en) | 2017-05-31 |
TWI506295B (zh) | 2015-11-01 |
US9130110B2 (en) | 2015-09-08 |
EP2432035A2 (en) | 2012-03-21 |
CN102569017A (zh) | 2012-07-11 |
US20120070992A1 (en) | 2012-03-22 |
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