JP6474390B2 - 変色層として無機物質を使用したプラズマ処理検知インジケータ - Google Patents
変色層として無機物質を使用したプラズマ処理検知インジケータ Download PDFInfo
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- JP6474390B2 JP6474390B2 JP2016517863A JP2016517863A JP6474390B2 JP 6474390 B2 JP6474390 B2 JP 6474390B2 JP 2016517863 A JP2016517863 A JP 2016517863A JP 2016517863 A JP2016517863 A JP 2016517863A JP 6474390 B2 JP6474390 B2 JP 6474390B2
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- oxide
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- plasma
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- 238000001514 detection method Methods 0.000 title claims description 48
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- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims description 23
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- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 7
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Description
1. プラズマ処理により変色する変色層を有するプラズマ処理検知インジケータであって、
前記変色層は、Mo、W、Sn、V、Ce、Te及びBiからなる群から選択される少なくとも一種の金属元素の単体及び/又は当該金属元素を含む無機化合物を含有するプラズマ処理検知インジケータ。
2. 前記無機化合物中の前記金属元素の価数は、Mo(II)〜(VI)、W(II)〜(VI)、Sn(II)、Sn(IV)、V(II)〜(V)、Ce(III)〜(IV)、Te(II)、Te(IV)、Te(VI)、Bi(III)及びBi (V)からなる群から選択される少なくとも一種である、上記項1に記載のプラズマ処理検知インジケータ。
3. 前記無機化合物は、前記金属元素の酸化物、水酸化物、炭酸塩、酸化物塩、オキソ酸、オキソ酸塩及びオキソ錯体からなる群から選択される少なくとも一種である、上記項1又は2に記載のプラズマ処理検知インジケータ。
4. 前記変色層は、酸化モリブデン(IV)、酸化モリブデン(VI)、酸化タングステン(VI)、酸化スズ(IV)、酸化バナジウム(II)、酸化バナジウム(III)、酸化バナジウム(IV)、酸化バナジウム(V)、酸化セリウム(IV)、酸化テルル(IV)、酸化ビスマス(III)、水酸化セリウム(IV)、水酸化ビスマス(III)、水酸化バナジウム(III)、水酸化モリブデン(V)、炭酸酸化ビスマス(III)、酸化硫酸バナジウム(IV)、モリブデン酸アンモニウム、モリブデン酸ナトリウム、モリブデン酸カリウム、タングステン酸ナトリウム、タングステン酸アンモニウム、オルトバナジン酸ナトリウム、メタバナジン酸アンモニウム及びメタバナジン酸ナトリウムからなる群から選択される少なくとも一種を含有する、上記項1〜3のいずれかに記載のプラズマ処理検知インジケータ。
5. 前記変色層は、酸化モリブデン(VI)、酸化タングステン(VI)、酸化バナジウム(III)、酸化バナジウム(V)及び酸化ビスマス(III)からなる群から選択される少なくとも一種を含有する、上記項1〜3のいずれかに記載のプラズマ処理検知インジケータ。
6. 前記変色層を支持する基材を有する、上記項1〜5のいずれかに記載のプラズマ処理検知インジケータ。
7. 電子デバイス製造装置で使用するインジケータである、上記項1〜6のいずれかに記載のプラズマ処理検知インジケータ。
8. 前記インジケータの形状が、前記電子デバイス製造装置で使用される電子デバイス基板の形状と同一である、上記項7に記載のプラズマ処理検知インジケータ。
9. 前記電子デバイス製造装置は、成膜工程、エッチング工程、アッシング工程、不純物添加工程及び洗浄工程からなる群から選択される少なくとも一種のプラズマ処理を行う、上記項7又は8のいずれかに記載のプラズマ処理検知インジケータ。
10. プラズマ処理により変色しない非変色層を有する、上記項1〜9のいずれかに記載のプラズマ処理検知インジケータ。
11. 前記非変色層は、酸化チタン(IV)、酸化ジルコニウム(IV)、酸化イットリウム(III)、硫酸バリウム、酸化マグネシウム、二酸化ケイ素、アルミナ、アルミニウム、銀、イットリウム、ジルコニウム、チタン及び白金からなる群から選択される少なくとも一種を含有する、上記項10に記載のプラズマ処理検知インジケータ。
12. 前記基材上に、前記非変色層及び前記変色層が順に形成されており、前記非変色層が、前記基材の主面上に隣接して形成されており、前記変色層が、前記非変色層の主面上に隣接して形成されている、上記項10又は11に記載のプラズマ処理検知インジケータ。
本発明のインジケータは、プラズマ処理により変色する変色層を有し、前記変色層は、Mo、W、Sn、V、Ce、Te及びBiからなる群から選択される少なくとも一種の金属元素の単体及び/又は当該金属元素を含む無機化合物を含有する。特に本発明では、プラズマ処理により金属元素の価数が変化することで化学的に変色が生じる。かかる金属元素の単体及び金属元素を含む無機化合物は、有機成分とは異なり、プラズマ処理によりガス化したり微細な屑となって飛散したりすることが、電子デバイス特性に影響を及ぼさない程度に抑制されている上、電子デバイス製造時のプロセス温度に耐え得る耐熱性を有する。
本発明のインジケータは、上記変色層を支持する基材を有していてもよい。
本発明のインジケータは、変色層の視認性を高めるために下地層としてプラズマ処理により変色しない非変色層を設けてもよい。非変色層としては、耐熱性があり、且つガス化しないことも求められる。かかる非変色層としては、白色層、メタル層等が好ましい。
本発明のインジケータの形状は特に限定されず、公知のプラズマ処理検知インジケータに採用されている形状を幅広く用いることができる。この中でも本発明のインジケータの形状を電子デバイス製造装置で使用される電子デバイス基板の形状と同一とする場合には、いわゆるダミー基板として、簡便にプラズマ処理が電子デバイス基板全体に対して均一に行われているかどうかを検知することが可能となる。
プラズマとしては、特に限定されず、プラズマ発生用ガスによって発生するプラズマを使用することができる。プラズマの中でも、酸素、窒素、水素、塩素、アルゴン、シラン、アンモニア、臭化硫黄、三塩化ホウ素、臭化水素、水蒸気、亜酸化窒素、テトラエトキシシラン、三フッ化窒素、四フッ化炭素、パーフルオロシクロブタン、ジフルオロメタン、トリフルオロメタン、四塩化炭素、四塩化ケイ素、六フッ化硫黄、六フッ化エタン、四塩化チタン、ジクロロシラン、トリメチルガリウム、トリメチルインジウム、及びトリメチルアルミニウムからなる群から選ばれた少なくとも一種のプラズマ発生用ガスによって発生するプラズマが好ましい。これらのプラズマ発生用ガスの中でも、特に四フッ化炭素;パーフルオロシクロブタン;トリフルオロメタン;六フッ化硫黄;アルゴンと酸素との混合ガス;からなる群から選択される少なくとも一種が好ましい。
各実施例で使用する本発明の無機粉末(金属酸化物粉末)として下記のものを準備した。
・実施例1:MoO3粉末(和光純薬工業株式会社製、平均粒子径60μm、0.3g)
・実施例2:WO3粉末(和光純薬工業株式会社製、平均粒子径60μm、0.3g)
・実施例3:V2O3粉末(和光純薬工業株式会社製、平均粒子径60μm、0.3g)
・実施例4:V2O5粉末(和光純薬工業株式会社製、平均粒子径60μm、0.3g)
・実施例5:Bi2O3粉末(和光純薬工業株式会社製、平均粒子径60μm、0.3g)
各金属酸化物粉末をプレス機でペレット状に成型し、次いで電気炉で焼結(600℃、1時間)させることによりペレット状(φ= 7mm, t = 2mm)の変色層からなるインジケータを作製した。
下記表1に示す組成のスラリーを用意し、それを基板上に塗布及び焼成することにより石英基板上に500nmのBi2O3薄膜を成膜した。
図1は、容量結合プラズマ(CCP;Capacitively Coupled Plasma)型のプラズマエッチング装置の概略断面図である。
図2は、誘導結合プラズマ(ICP;Inductively Coupled Plasma)型のプラズマエッチング装置の概略断面図である。
試験例1で用いたプラズマエッチング装置内に実施例6で作製したインジケータを載置し、反応性ガスとして四フッ化炭素ガス(CF4)を導入しプラズマ処理した場合についてインジケータの変色層の変色性を評価した。
実施例5で作製したインジケータと、変色層に有機成分を含有する従来例1のプラズマ処理検知インジケータとを用意し、昇温時の放出ガス特性を比較した。なお、従来例1のプラズマ処理検知インジケータは、基材上に変色層が形成されており、変色層は下記表7に示す組成のインキ組成物(成分はいずれも有機成分)を塗布及び乾燥させて形成した。
Claims (12)
- プラズマ処理により変色する変色層を有するプラズマ処理検知インジケータであって、
前記変色層は、無機粉末を含有し、
前記無機粉末は、Mo、W、Sn、V、Ce、Te及びBiからなる群から選択される少なくとも一種の金属元素の単体及び/又は当該金属元素を含む無機化合物から形成されており、
前記変色層において前記無機粉末以外の有機成分が排除されている、プラズマ処理検知インジケータ。 - 前記無機化合物中の前記金属元素の価数は、Mo(II)〜(VI)、W(II)〜(VI)、Sn(II)、Sn(IV)、V(II)〜(V)、Ce(III)〜(IV)、Te(II)、Te(IV)、Te(VI)、Bi(III)及びBi (V)からなる群から選択される少なくとも一種である、請求項1に記載のプラズマ処理検知インジケータ。
- 前記無機化合物は、前記金属元素の酸化物、水酸化物、炭酸塩、酸化物塩、オキソ酸、オキソ酸塩及びオキソ錯体からなる群から選択される少なくとも一種である、請求項1又は2に記載のプラズマ処理検知インジケータ。
- 前記変色層は、酸化モリブデン(IV)、酸化モリブデン(VI)、酸化タングステン(VI)、酸化スズ(IV)、酸化バナジウム(II)、酸化バナジウム(III)、酸化バナジウム(IV)、酸化バナジウム(V)、酸化セリウム(IV)、酸化テルル(IV)、酸化ビスマス(III)、水酸化セリウム(IV)、水酸化ビスマス(III)、水酸化バナジウム(III)、水酸化モリブデン(V)、炭酸酸化ビスマス(III)、酸化硫酸バナジウム(IV)、モリブデン酸アンモニウム、モリブデン酸ナトリウム、モリブデン酸カリウム、タングステン酸ナトリウム、タングステン酸アンモニウム、オルトバナジン酸ナトリウム、メタバナジン酸アンモニウム及びメタバナジン酸ナトリウムからなる群から選択される少なくとも一種を含有する、請求項1〜3のいずれかに記載のプラズマ処理検知インジケータ。
- 前記変色層は、酸化モリブデン(VI)、酸化タングステン(VI)、酸化バナジウム(III)、酸化バナジウム(V)及び酸化ビスマス(III)からなる群から選択される少なくとも一種を含有する、請求項1〜3のいずれかに記載のプラズマ処理検知インジケータ。
- 前記変色層を支持する基材を有する、請求項1〜5のいずれかに記載のプラズマ処理検知インジケータ。
- 電子デバイス製造装置で使用するインジケータである、請求項1〜6のいずれかに記載のプラズマ処理検知インジケータ。
- 前記インジケータの形状が、前記電子デバイス製造装置で使用される電子デバイス基板の形状と同一である、請求項7に記載のプラズマ処理検知インジケータ。
- 前記電子デバイス製造装置は、成膜工程、エッチング工程、アッシング工程、不純物添加工程及び洗浄工程からなる群から選択される少なくとも一種のプラズマ処理を行う、請求項7又は8のいずれかに記載のプラズマ処理検知インジケータ。
- プラズマ処理により変色しない非変色層を有する、請求項1〜9のいずれかに記載のプラズマ処理検知インジケータ。
- 前記非変色層は、酸化チタン(IV)、酸化ジルコニウム(IV)、酸化イットリウム(III)、硫酸バリウム、酸化マグネシウム、二酸化ケイ素、アルミナ、アルミニウム、銀、イットリウム、ジルコニウム、チタン及び白金からなる群から選択される少なくとも一種を含有する、請求項10に記載のプラズマ処理検知インジケータ。
- 前記基材上に、前記非変色層及び前記変色層が順に形成されており、前記非変色層が、前記基材の主面上に隣接して形成されており、前記変色層が、前記非変色層の主面上に隣接して形成されている、請求項10又は11に記載のプラズマ処理検知インジケータ。
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