JP2013080834A - 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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- JP2013080834A JP2013080834A JP2011220257A JP2011220257A JP2013080834A JP 2013080834 A JP2013080834 A JP 2013080834A JP 2011220257 A JP2011220257 A JP 2011220257A JP 2011220257 A JP2011220257 A JP 2011220257A JP 2013080834 A JP2013080834 A JP 2013080834A
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- Formation Of Insulating Films (AREA)
Abstract
【解決手段】半導体基板上に誘電体膜を形成する成膜工程と、前記誘電体膜を熱処理する熱処理工程と、前記誘電体膜上の一部に電極を形成する電極形成工程と、前記電極の形成されていない前記誘電体膜にイオン化したガスクラスターを照射する照射工程と、前記照射工程の後、ウェットエッチングにより、前記イオン化したガスクラスターの照射された領域における前記誘電体膜を除去するエッチング工程と、を有することを特徴とする半導体装置の製造方法を提供することにより上記課題を解決する。
【選択図】図3
Description
第1の実施の形態を図3に基づき説明する。本実施の形態はゲート絶縁膜としてhigh-k膜を形成する半導体装置の製造方法である。
(high-k膜の特性)
次に、本実施の形態において形成したhigh-k膜のエッチング特性について説明する。ここで用いたhigh-k膜の材料は酸化アルミニウムであり、CVD法を用いて成膜を行った。尚、サンプルAはhigh-k膜を20nm成膜した後に850℃で300秒の熱処理を行った状態のものであり、サンプルBはサンプルAと同様の熱処理を行った後に、さらにクラスターイオンを照射したものである。
次に、イオン化したガスクラスターの照射に用いられるガスクラスター照射装置について説明する。
次に、図6に基づき第2の実施形態について説明する。本実施の形態は、Si基板等からなる半導体基板上に誘電体膜の膜厚(high-k膜の膜厚)の異なる領域を形成した構造の半導体装置の形成方法に関するものである。
12 high-k膜
12a ゲート領域のhigh-k膜
12b 変質膜
13 電極膜
13a ゲート電極
14 ハードマスク層
14a ハードマスク
15 レジストパターン
21 半導体基板
22 素子分離領域
23 ウェル
24 SiO2膜
25 レジストパターン
26 SiO2膜
27 high-k膜
51 ノズル部
52 イオン化電極
53 加速電極
54 クラスター選別部
55 ガスクラスター
101 半導体基板
102 high-k膜
102a ゲート領域のhigh-k膜
102b 変質層
103 電極膜
103a ゲート電極
104 ハードマスク層
104a ハードマスク
105 レジストパターン
201 半導体基板
202 素子分離領域
203 ウェル
204 界面層
205 high-k膜
205a 変質膜
205b 厚いhigh-k膜
205c 薄いhigh-k膜
206 レジストパターン
207 ガスクラスター
b1 厚いhigh-k膜が形成された領域
b2 薄いhigh-k膜が形成された領域
Claims (9)
- 半導体基板上に誘電体膜を形成する成膜工程と、
前記誘電体膜を熱処理する熱処理工程と、
前記誘電体膜上の一部に電極を形成する電極形成工程と、
前記電極の形成されていない前記誘電体膜にイオン化したガスクラスターを照射する照射工程と、
前記照射工程の後、ウェットエッチングにより、前記イオン化したガスクラスターの照射された領域における前記誘電体膜を除去するエッチング工程と、
を有することを特徴とする半導体装置の製造方法。 - 前記誘電体膜を構成する材料は、HfO2、ZrO2、Al2O3、Ta2O5、TiO2のいずれかを含む材料であ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。
- 前記電極形成工程は、
前記誘電体膜上に電極膜を形成し、
前記電極膜上に酸化膜又は窒化膜からなる化合物膜を形成し、
前記化合物膜上にレジストパターンを形成し、
前記レジストパターンをマスクとして前記レジストパターンの形成されていない領域の化合物膜を除去することにより化合物マスクを形成し、
前記化合物マスクの形成されていない領域における前記電極膜を除去するものである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。 - 前記誘電体膜の膜厚は、2nm以下であることを特徴とする請求項1から3のいずれかに記載の半導体装置の製造方法。
- 半導体基板上に誘電体膜を形成する誘電体膜形成工程と、
前記誘電体膜上にレジストパターンを形成するレジストパターン形成工程と、
前記レジストパターンの形成されていない前記誘電体膜にイオン化したガスクラスターを照射する照射工程と、
前記誘電体膜のうち、前記イオン化したガスクラスターが照射された領域の膜厚方向の一部をウェットエッチングにより除去するエッチング工程と、
を含むものであって、
前記誘電体膜はゲート絶縁膜となるものであり、前記誘電体膜の膜厚が異なる2つの領域を形成することを特徴とする半導体装置の形成方法。 - 半導体基板上に第1の誘電体膜を形成する第1誘電体膜形成工程と、
前記第1誘電体膜上に前記第1の誘電体膜を構成する材料の比誘電率よりも高い比誘電率を有する材料により構成される第2の誘電体膜を形成する第2誘電体膜形成工程と、
前記第2の誘電体膜上にレジストパターンを形成するレジストパターン形成工程と、
前記レジストパターンの形成されていない前記第2の誘電体膜にイオン化したガスクラスターを照射する照射工程と、
前記第2の誘電体膜のうち、前記イオン化したガスクラスターが照射された領域の膜厚方向の一部をウェットエッチングにより除去するエッチング工程と、
を含むものであって、
ゲート絶縁膜は前記第1の誘電体膜と前記第2の誘電体膜とにより形成されるものであり、前記ゲート絶縁膜は、前記イオン化したガスクラスターが照射された領域とされていない領域とにおいて膜厚が異なるものであることを特徴とする半導体装置の形成方法。 - 前記誘電体膜または前記第2の誘電体膜を構成する材料は、HfO2、ZrO2、Al2O3、Ta2O5、TiO2のいずれかを含む材料であることを特徴とする請求項6に記載の半導体装置の製造方法。
- 前記ウェットエッチングは希フッ酸によるエッチングであることを特徴とする請求項1から7のいずれかに記載の半導体装置の製造方法。
- 前記ガスクラスターを構成する原子の数の平均は、1000以上であることを特徴とする請求項1から8のいずれかに記載の半導体装置の製造方法。
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