JP2021158174A - 基板処理方法および基板処理装置 - Google Patents
基板処理方法および基板処理装置 Download PDFInfo
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Abstract
Description
最初に、図1および図2を参照しながら、実施形態に係る基板処理システム1の概略構成について説明する。図1は、実施形態に係る基板処理システム1の模式平面図であり、図2は、実施形態に係る基板処理システム1の模式側面図である。
次に、実施形態に係る周縁部処理ユニット18の構成について、図3を参照しながら説明する。図3は、実施形態に係る周縁部処理ユニット18の模式図である。図3に示すように、周縁部処理ユニット18は、チャンバ21と、基板保持部22と、処理液供給部23と、回収カップ24とを備える。
次に、実施形態に係る裏面処理ユニット19の構成について、図4を参照しながら説明する。図4は、実施形態に係る裏面処理ユニット19の模式図である。図4に示すように、裏面処理ユニット19は、チャンバ31と、基板保持部32と、処理液供給部33と、回収カップ34とを備える。
次に、実施形態に係るボロン含有シリコン膜Aのエッチング処理の詳細について、図5〜図10を参照しながら説明する。上述したように、実施形態では、ウェハWに形成されたボロン含有シリコン膜Aを、フッ酸と硝酸とが所定の割合で混合された酸化性水溶液Lで適切にエッチングすることができる。その原理について以下に説明する。
HNO2 + HNO3 → N2O4 + H2O ・・・(1)
N2O4 + 2NO2 ⇔ 2NO2 − + 2h+ ・・・(2)
2NO2 − + 2H+ ⇔ 2HNO2 ・・・(3)
2NO2 → 2NO2 − + 2h+ ・・・(4)
2NO2 − + 2H+ ⇔ 2HNO2 ・・・(5)
Si0 + 2h+ → Si2+ ・・・(6)
Si2+ + 2OH− → Si(OH)2 ・・・(7)
Si(OH)2 → SiO2 + H2O ・・・(8)
SiO2 + 6HF → H2SiF6 + 2H2O ・・・(9)
B + NO2 + OH− → BOx + NO2 − + H2O ・・・(10)
HNO3 ⇔ NO3 − + H+ ・・・(11)
ここまで説明した実施形態では、ウェハWの裏面Wbまたは周縁部Wcに酸化性水溶液Lを吐出してエッチング処理を行う例について示したが、実施形態に係るエッチング処理はこれらの例に限られない。
つづいて、実施形態に係る基板処理の手順について、図14および図15を参照しながら説明する。図14は、実施形態に係る基板処理システム1が実行する基板処理の手順を示すフローチャートである。
1、1A 基板処理システム(基板処理装置の一例)
6、108 制御部
18 周縁部処理ユニット
19 裏面処理ユニット
160 全面処理ユニット
22、32、163 基板保持部
23、33、205 処理液供給部
A ボロン含有シリコン膜
L 酸化性水溶液
Claims (12)
- ボロン含有シリコン膜が形成された基板を保持する工程と、
保持された前記基板にフッ酸と硝酸とを含む酸化性水溶液を供給する工程と、
前記酸化性水溶液で前記基板の前記ボロン含有シリコン膜をエッチングする工程と、
を含む基板処理方法。 - 前記酸化性水溶液におけるフッ酸と硝酸との混合比は、1:1〜1:10の範囲である
請求項1に記載の基板処理方法。 - 前記酸化性水溶液の温度は、20℃〜80℃の範囲である
請求項1または2に記載の基板処理方法。 - 前記酸化性水溶液は、酢酸をさらに含む
請求項1〜3のいずれか一つに記載の基板処理方法。 - 前記供給する工程は、前記基板の周縁部に前記酸化性水溶液を供給する
請求項1〜4のいずれか一つに記載の基板処理方法。 - 前記供給する工程は、前記基板の裏面に前記酸化性水溶液を供給する
請求項1〜5のいずれか一つに記載の基板処理方法。 - 前記供給する工程は、前記基板の全面に前記酸化性水溶液を供給する
請求項1〜4のいずれか一つに記載の基板処理方法。 - ボロン含有シリコン膜が形成された基板を保持する基板保持部と、
前記基板保持部で保持された前記基板にフッ酸と硝酸とを含む酸化性水溶液を供給する処理液供給部と、
を備える基板処理装置。 - 前記処理液供給部は、前記基板の裏面に前記酸化性水溶液を供給する
請求項8に記載の基板処理装置。 - 前記基板保持部は、前記基板を回転可能に保持し、
前記処理液供給部は、回転数が200(rpm)〜1000(rpm)の範囲で回転する前記基板の裏面に前記酸化性水溶液を供給する
請求項9に記載の基板処理装置。 - 前記処理液供給部は、前記基板の周縁部に前記酸化性水溶液を供給する
請求項8に記載の基板処理装置。 - 前記基板保持部は、前記基板を回転可能に保持し、
前記処理液供給部は、回転数が400(rpm)〜1000(rpm)の範囲で回転する前記基板の周縁部に前記酸化性水溶液を供給する
請求項11に記載の基板処理装置。
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