JP2013239749A - 窒化膜のスパッタリング方法、ゲート絶縁膜の形成方法 - Google Patents
窒化膜のスパッタリング方法、ゲート絶縁膜の形成方法 Download PDFInfo
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- JP2013239749A JP2013239749A JP2013172932A JP2013172932A JP2013239749A JP 2013239749 A JP2013239749 A JP 2013239749A JP 2013172932 A JP2013172932 A JP 2013172932A JP 2013172932 A JP2013172932 A JP 2013172932A JP 2013239749 A JP2013239749 A JP 2013239749A
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
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Abstract
【解決手段】基板上に窒化膜を形成する工程と、前記窒化膜をKrあるいはArを不活性ガスとしたプラズマに伴い生成された原子状窒化水素NH*に曝し、膜質を改変する工程とよりなる窒化膜あるいはゲート絶縁膜の形成方法を提供する。
【選択図】図17B
Description
処理室中において、基板上にターゲットのスパッタリングにより、窒化膜を堆積する工程と、
前記処理室中において、KrあるいはArよりなる不活性ガスと窒素と水素を含むガスとをマイクロ波励起することにより、プラズマを形成する工程と、
前記プラズマ中に生成された窒化水素ラジカルNH*により、前記窒化膜を処理する工程とよりなることを特徴とする窒化膜のスパッタリング方法を提供する。
基板上へのゲート絶縁膜の形成方法であって、
基板表面に窒化膜を形成する工程と、
前記窒化膜を、50〜100mTorrのガス圧において窒化水素ラジカルNH*により処理する工程と、
前記処理された窒化膜上に、高誘電体膜を堆積する工程と
前記高誘電体膜の表面を、窒化水素ラジカルNH*により処理し、窒化膜を形成する工程とよりなることを特徴とするゲート絶縁膜の形成方法を提供する。
まずは、プラズマを用いた低温の酸化膜形成について述べる。
次に、高密度マイクロ波プラズマを用いた低温での窒化膜形成について述べる。
以上説明した酸化膜および窒化膜形成方法は、ポリシリコンの酸化・窒化に対しても同様に適用され、良質な酸化膜、窒化膜をポリシリコン上に形成することが可能である。
図12A,12Bは、本発明の第4実施例によるCVD酸化膜の改質(ポストアニール)処理を示す。
図14A,14Bは、本発明の第5実施例による高誘電体膜のポストアニール処理を示す。
図15A,15Bは、本発明の第6実施例による強誘電体膜のポストアニール処理を示す。
図16A,16Bは、本発明の第7実施例による低誘電率絶縁膜のポストアニール処理を示す。
図17A〜17Eは、本発明の第8実施例による高融電率ゲート絶縁膜の形成方法を示す。
図18は、本発明の第9実施例による基板上への酸化膜の形成方法を示す。
次に、本発明の第10実施例による、Kr/O2プラズマにより励起された原子状酸素O*あるいはKr/NH3プラズマにより励起された窒化水素ラジカルNH*を使ったスパッタリング処理について、図19を参照しながら説明する。ただし図19中、先に説明した部分には同一の参照符号を付し、説明を省略する。
次に、上述したマイクロ波プラズマを用いた低温の酸化膜と窒化膜の形成技術を使用した、ポリシリコン/シリサイド積層構造のゲート電極を有する高電圧用トランジスタと低電圧用トランジスタを包含する、本発明の第11実施例によるフラッシュメモリ素子の製造工程を説明する。
次に、前記高密度マイクロ波プラズマを用いた低温での酸化膜と窒化膜の形成技術を使用した、ポリシリコン/シリサイド積層構造のゲート電極を有する、本発明の第5実施例によるフラッシュメモリ素子について説明する。
次に、前記マイクロ波高密度プラズマを用いた低温酸化膜と窒化膜の形成技術を使用した、ポリシリコン/シリサイド積層構造のゲート電極を有する本発明の第13実施例によるフラッシュメモリ素子1600について説明する。
102 シャワープレート
103 被処理基板
104 加熱機構を持つ試料台
105 同軸導波管
106 ラジアルラインスロットアンテナ
107 マイクロ波導入窓
120 CVD装置
121 処理室121
121A 排気ポート
121B ポンプ
122A,122B マイクロ波窓
123A,123B マイクロ波アンテナ
123C ホーンアンテナ
124 ステージ
124A ヒータ
125 被処理基板
126 シャワープレート
126A,127A ライン
127 ガス導入ポート
130 スパッタ装置
131 ターゲット
131A 高周波電源
132 マグネット
133 ガス導入ポート
201,301,401,501,601,701,1001 シリコン基板
202 絶縁膜
203 ポリシリコン膜
204,302,402,502,1002 シリコン酸化膜
205,702,1004 シリコン窒化膜
206 酸窒化膜
403,503 Pt電極層
404,703 高誘電体膜
504 強誘電体膜
602 低誘電率膜
703A 窒化膜
704 フローティングゲート
1000 フラッシュメモリ素子
1003 ポリシリコン電極
1005 シリコン酸化膜
1006 シリコン窒化膜
1007 シリコン酸化膜
1008 ポリシリコン電極
1101 シリコン基板
1102 フィールド酸化膜
1103 シリコン酸化膜
1104 シリコン酸化膜
1105 ポリシリコン電極
1106 NONO膜
1107 シリコン酸化膜
1108 シリコン酸化膜
1109 ポリシリコン電極
1110 シリサイド電極
1111A フラッシュメモリセル
1111B 高電圧用トランジスタ電極
1111C 低電圧用トランジスタ電極
1501 シリコン基板
1502 トンネル酸化膜
1503 ポリシリコンゲート電極
1504 シリコン酸化膜
1505 シリコン窒化膜
1506 シリコン酸化膜
1507 第2ポリシリコンゲート電極
1601 シリコン基板
1602 トンネル酸化膜
1603 ポリシリコンゲート電極
1604 シリコン窒化膜
1605 シリコン酸化膜
1606 第2ポリシリコンゲート電極
Claims (2)
- 処理室中において、基板上にターゲットのスパッタリングにより、窒化膜を堆積する工程と、
前記処理室中において、KrあるいはArよりなる不活性ガスと窒素と水素を含むガスとをマイクロ波励起することにより、プラズマを形成する工程と、
前記プラズマ中に生成された窒化水素ラジカルNH*により、前記窒化膜を処理する工程とよりなることを特徴とする窒化膜のスパッタリング方法。 - 基板上へのゲート絶縁膜の形成方法であって、
基板表面に窒化膜を形成する工程と、
前記窒化膜を、50〜100mTorrのガス圧において窒化水素ラジカルNH*により処理する工程と、
前記処理された窒化膜上に、高誘電体膜を堆積する工程と、
前記高誘電体膜の表面を、窒化水素ラジカルNH*により処理し、窒化膜を形成する工程とよりなることを特徴とするゲート絶縁膜の形成方法。
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