JP2021141117A - 半導体装置の製造方法 - Google Patents
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Abstract
Description
実施の形態1にかかる半導体装置の製造方法について、実施の形態1にかかる半導体装置として、FWD領域にヘリウム(He)照射によりヘリウムの欠陥を導入した耐圧1200VクラスのRC−IGBTを作製(製造)する場合を例に説明する。耐圧とは、素子が誤動作や破壊を起こさない限界の電圧である。図1は、実施の形態1にかかる半導体装置の製造途中の状態を半導体ウエハのおもて面側から見た状態を示す平面図である。図1には、フォトレジスト膜31をハッチングで示す。
次に、実施の形態2にかかる半導体装置の製造方法について説明する。図7,8は、実施の形態2にかかる半導体装置の製造途中の状態を示す断面図である。図7,8には、図2のステップS8のヘリウム照射32時の、半導体ウエハ10のおもて面10a側の状態を模式的に示す。また、図7,8では、半導体ウエハ10に形成された素子構造を図示省略するが、半導体ウエハ10に形成されたIGBT領域21およびFWD領域22の素子構造は図1と同様である。
次に、実施の形態3にかかる半導体装置の製造方法について説明する。実施の形態3にかかる半導体装置の製造方法が実施の形態1にかかる半導体装置の製造方法(図1,2参照)と異なる点は、ステップS7の処理(半導体ウエハ10の乾燥)時に、異なる回転数で2回(2段)続けて半導体ウエハ10を高速回転させて、半導体ウエハ10の表面やフォトレジスト膜31の開口部31a内に残る水(純水)を飛ばす点である。
2 p型ベース領域
3 n+型エミッタ領域
4 p+型コンタクト領域
5 n型蓄積層
6 トレンチ
7 ゲート絶縁膜
8 ゲート電極
9 層間絶縁膜
10 半導体ウエハ
10a 半導体ウエハのおもて面
10b 半導体ウエハの裏面
10c 半導体ウエハのチップ領域
10d 半導体ウエハの周縁部
11 おもて面電極
12 n型フィールドストップ層
13 p+型コレクタ領域
14 n+型カソード領域
15 He欠陥
20 RC−IGBT
21 IGBT領域
22 FWD領域
23 無効領域
31,31' フォトレジスト膜
31a,31a' フォトレジスト膜の開口部
31b ダイシングライン
31c,31c' フォトレジスト膜のパターンの端面
32 ヘリウム照射
t1,t1’ フォトレジスト膜の厚さ
w1,w2 フォトレジスト膜の開口部の幅
w11 半導体ウエハの周縁部の、フォトレジスト膜で覆わない部分の幅
x1 半導体ウエハの半径
x2 フォトレジスト膜の開口部の容積
y1,y3 半導体ウエハの乾燥時の回転数上限
y2,y4 半導体ウエハの乾燥時の回転数下限
Claims (9)
- 半導体ウエハの第1主面にフォトレジスト膜を形成する形成工程と、
前記フォトレジスト膜の所定箇所に開口部のパターンを形成する現像工程と、
前記現像工程の後、前記半導体ウエハを水で洗浄する洗浄工程と、
前記洗浄工程で前記フォトレジスト膜の開口部に溜まった水を、前記半導体ウエハを当該半導体ウエハの第1主面と直交する中心軸周りに所定回転数で回転させることで生じさせた遠心力によって飛ばすことで、前記半導体ウエハを乾燥させる乾燥工程と、
前記乾燥工程の後、前記フォトレジスト膜をマスクとして、前記半導体ウエハの第1主面から所定の加速エネルギーで所定の不純物をイオン注入する注入工程と、
を含み、
前記乾燥工程では、前記半導体ウエハの回転数を、前記フォトレジスト膜の厚さに応じて決まる上限値以下に設定することを特徴とする半導体装置の製造方法。 - 前記乾燥工程では、前記半導体ウエハの回転数を前記上限値以下に設定することで、前記半導体ウエハの外周部付近の前記遠心力を1.2N以下とすることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記半導体ウエハの回転数の前記上限値をy1とし、前記半導体ウエハの半径をx1としたときに、y1=−10x1+3650を満たすことを特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記乾燥工程では、前記半導体ウエハの回転数を、前記フォトレジスト膜の開口部の容積に応じて決まる前記上限値以下に設定することを特徴とする請求項1〜3のいずれか一つに記載の半導体装置の製造方法。
- 前記半導体ウエハの回転数の前記上限値をy3とし、前記フォトレジスト膜の開口部の容積をx2としたときに、y3=−16475x2+5640.2を満たすことを特徴とする請求項4に記載の半導体装置の製造方法。
- 前記乾燥工程では、前記半導体ウエハを1回だけ回転させて乾燥させることを特徴とする請求項1〜5のいずれか一つに記載の半導体装置の製造方法。
- 前記乾燥工程では、
前記半導体ウエハを異なる回転数で2回続けて回転させて乾燥させ、
2回目に前記半導体ウエハを回転させる際の回転数を、1回目に前記半導体ウエハを回転させる際の回転数よりも多く設定することを特徴とする請求項1〜5のいずれか一つに記載の半導体装置の製造方法。 - 前記形成工程では、前記フォトレジスト膜の厚さを20μm以上にすることを特徴とする請求項1〜7のいずれか一つに記載の半導体装置の製造方法。
- 前記現像工程では、前記フォトレジスト膜に、矩形状の平面形状で開口面積が1mm2以上となる開口部を形成することを特徴とする請求項1〜8のいずれか一つに記載の半導体装置の製造方法。
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