JP7338482B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP7338482B2 JP7338482B2 JP2020003728A JP2020003728A JP7338482B2 JP 7338482 B2 JP7338482 B2 JP 7338482B2 JP 2020003728 A JP2020003728 A JP 2020003728A JP 2020003728 A JP2020003728 A JP 2020003728A JP 7338482 B2 JP7338482 B2 JP 7338482B2
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Description
最初に本開示の実施形態の内容を列記して説明する。
(1)本開示の一実施例は、半導体基板上に、第1フォトレジスト膜を形成し、前記第1フォトレジスト膜上に前記第1フォトレジスト膜より酸性度の高い第2フォトレジスト膜を形成する工程と、前記第1フォトレジスト膜および前記第2フォトレジスト膜をパターニングすることで前記半導体基板の表面を露出させる開口部を形成する工程と、前記第2フォトレジスト膜の上面および前記開口部の内部にシュリンク材を塗布し、前記第1フォトレジスト膜、前記第2フォトレジスト膜、および前記シュリンク材を熱処理することで、前記開口部の内部において前記シュリンク材と前記第2フォトレジスト膜を反応させる工程と、前記第2フォトレジスト膜の上面および前記開口部の内部の前記第2フォトレジスト膜と未反応の前記シュリンク材を除去する工程と、を備える半導体装置の製造方法である。これにより、リフトオフ法に適した開口部の形状を有するフォトレジスト膜を形成できる。
(2)前記シュリンク材はポリビニルアルコールを含み、前記第1フォトレジスト膜および前記第2フォトレジスト膜はノボラック系樹脂を含み、前記第1フォトレジスト膜および前記第2フォトレジスト膜はさらに乳酸エチルを含み、前記第2フォトレジスト膜の乳酸エチルの重量濃度は前記第1フォトレジスト膜の乳酸エチルの重量濃度より高いことが好ましい。
(3)前記シュリンク材はポリビニルアルコールを含み、前記第1フォトレジスト膜および前記第2フォトレジスト膜はノボラック系樹脂を含み、前記第2フォトレジスト膜はさらに乳酸エチルを含み、前記第1フォトレジスト膜は乳酸エチルを含まないことが好ましい。
(4)前記熱処理によって前記シュリンク材と反応した前記第2フォトレジスト膜における開口長は、前記第1フォトレジスト膜における開口長より小さいことが好ましい。
本開示の実施形態にかかる半導体装置の製造方法の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
上記作用を実証するため、以下の実験を行った。
シュリンク材24としてメルク社製AZR200を用いた。フォトレジストとして住友化学製PFI-89B8および東京応化製THMRiP-3500を用いた。
イソプロピルアルコール:5重量%~10重量%
水:85重量%以下
ポリビニルアルコール
乳酸エチル:34重量%~36重量%
2-ペプタノン:34重量%~36重量%
1,4-ジオキサン:1重量%未満
ノボラック樹脂:22重量%~26重量%
ナフトキノンアジト誘導体:6重量%
2-ペプタノン:45重量%~95重量%
1,4-ジオキサン:1重量%未満
クレゾール:1重量%未満
ノボラック樹脂
ナフトキノンアジト誘導体:1重量%~15重量%
なお、濃度の記載していない成分の濃度の値は、他の成分の重量%の合計値から求められる残量(重量%)以下と考えられる。
サンプルA:
半導体基板上に、膜厚が約0.3μmのTHMRiP-3500を塗布しフォトレジスト膜を形成する。i線ステッパを用い露光し現像することで、フォトレジスト膜に開口部を形成する。開口長は367nmであった。シュリンク材を塗布した後、全体を110℃70秒熱処理した。未反応のシュリンク材を水洗で除去した。フォトレジスト膜の開口は481nmであった。フォトレジスト膜の上部が収縮して開口は115nm拡大した。
基板上に、膜厚が約0.3μmのPFI-89B8を塗布しフォトレジスト膜を形成する。i線ステッパを用い露光し現像することで、フォトレジスト膜に開口部を形成する。開口長は489nmであった。シュリンク材を塗布した後110℃70秒熱処理した。未反応のシュリンク材を水洗で除去した。フォトレジスト膜の開口は351nmであった。開口は140nm縮小した。
実験1の結果を踏まえ、シュリンク材24としてメルク社製AZR200、フォトレジスト膜22として住友化学製PFI-89B8、フォトレジスト膜20として東京応化製THMRiP-3500を用い、図1(a)から図1(e)を参照しながら以下に説明する方法で開口を形成した。
11 基板
12 半導体層
14 オーミック電極
16 保護膜
17 金属膜
18 ゲート電極
20、22、25 フォトレジスト膜
24 シュリンク材
26 シュリンク膜
30、32、34、36 開口部
Claims (3)
- 半導体基板上に、第1フォトレジスト膜を形成し、前記第1フォトレジスト膜上に前記第1フォトレジスト膜より酸性度の高い第2フォトレジスト膜を形成する工程と、
前記第1フォトレジスト膜および前記第2フォトレジスト膜をパターニングすることで前記半導体基板の表面を露出させる開口部を形成する工程と、
前記第2フォトレジスト膜の上面および前記開口部の内部にシュリンク材を塗布し、前記第1フォトレジスト膜、前記第2フォトレジスト膜、および前記シュリンク材を熱処理することで、前記開口部の内部において前記シュリンク材と前記第2フォトレジスト膜を反応させる工程と、
前記第2フォトレジスト膜の上面および前記開口部の内部の前記第2フォトレジスト膜と未反応の前記シュリンク材を除去する工程と、
を備え、
前記シュリンク材はポリビニルアルコールを含み、
前記第1フォトレジスト膜および前記第2フォトレジスト膜はノボラック系樹脂を含み、
前記第1フォトレジスト膜および前記第2フォトレジスト膜はさらに乳酸エチルを含み、前記第2フォトレジスト膜の乳酸エチルの重量濃度は前記第1フォトレジスト膜の乳酸エチルの重量濃度より高い、半導体装置の製造方法。 - 半導体基板上に、第1フォトレジスト膜を形成し、前記第1フォトレジスト膜上に前記第1フォトレジスト膜より酸性度の高い第2フォトレジスト膜を形成する工程と、
前記第1フォトレジスト膜および前記第2フォトレジスト膜をパターニングすることで前記半導体基板の表面を露出させる開口部を形成する工程と、
前記第2フォトレジスト膜の上面および前記開口部の内部にシュリンク材を塗布し、前記第1フォトレジスト膜、前記第2フォトレジスト膜、および前記シュリンク材を熱処理することで、前記開口部の内部において前記シュリンク材と前記第2フォトレジスト膜を反応させる工程と、
前記第2フォトレジスト膜の上面および前記開口部の内部の前記第2フォトレジスト膜と未反応の前記シュリンク材を除去する工程と、
を備え、
前記シュリンク材はポリビニルアルコールを含み、
前記第1フォトレジスト膜および前記第2フォトレジスト膜はノボラック系樹脂を含み、
前記第2フォトレジスト膜はさらに乳酸エチルを含み、前記第1フォトレジスト膜は乳酸エチルを含まない、半導体装置の製造方法。 - 前記熱処理によって前記シュリンク材と反応した前記第2フォトレジスト膜における開口長は、前記第1フォトレジスト膜における開口長より小さい、請求項1または請求項2に記載の半導体装置の製造方法。
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