JP4895803B2 - 誘電体膜及びゲートスタックの形成方法並びに誘電体膜の処理方法 - Google Patents
誘電体膜及びゲートスタックの形成方法並びに誘電体膜の処理方法 Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 245
- 229910052757 nitrogen Inorganic materials 0.000 claims description 129
- 230000008569 process Effects 0.000 claims description 110
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 58
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- 239000010703 silicon Substances 0.000 claims description 58
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 40
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 38
- 239000000758 substrate Substances 0.000 claims description 36
- 238000000137 annealing Methods 0.000 claims description 30
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Description
[0002]本発明は、一般的には、半導体製造の分野に関する。更に詳細には、本発明は、オキシ窒化ケイ素(SiON又はSiOxNy)ゲート誘電体を形成するとともに急速加熱プロセス(RTP)を用いてゲートスタックにそれを集積化する方法に関する。
2).関連技術の説明
[0003]集積回路は、トランジスタ、キャパシタ、抵抗のような、文字通り何百万といった能動デバイスや受動デバイスから作られる。トランジスタ100は、一般的には、ソース102、ドレイン104、ゲートスタック106を含んでいる。ゲートスタック(図1)は、誘電体110(典型的には、二酸化シリコン(SiO2)で製造)を成長させた最上部上の基板108(例えば、典型的にはシリコンで製造)からなり、これは電極112(多結晶シリコンのような導電材料で製造)で覆われている。
[0006]複雑な集積化や材料の取扱いの問題を避けるために、デバイス製造業者は誘電体の厚さをできる限り減少させることによってデバイスパラメータを縮小したい。しかしながら、20オングストローム未満にSiO2の厚さを減少させることにより、トンネル電流の増加のためにゲート信頼性が悪くなり、基板へのホウ素の浸透が増加し、非常に薄い酸化物のプロセス制御が悪くなる。理論では、更に高いkゲート誘電体を用いるという代案は非常に魅力的に思われるが、下に横たわっているSi基板やポリシリコンゲート電極との物質適合性はSiO2を供給するものと適合させることができない。更に、SiO2を用いると、ゲート誘電体として希土類酸化物を導入する場合に扱われるに違いない汚染問題を処理する多くの物質が取り除かれる。
Claims (26)
- 誘電体膜の形成方法であって、
窒化物形成ガスと急速加熱アニールプロセスを用いて窒素を誘電体膜に取込むステップであって、該急速加熱アニールプロセスでの処理温度は900−1100℃の範囲にあり、処理時間は10−45秒間であって、該急速加熱アニールプロセスに10Torr以下の圧力が用いられる、前記ステップを含み、
前記誘電体膜は、該誘電体膜の上面に存在する窒素濃度ピークを生じる前記窒素を含む、
前記方法。 - 該誘電体膜に取込まれた該窒素の窒素濃度が5%以上である、請求項1記載の誘電体膜の形成方法。
- 該誘電体膜が12オングストローム以下である、請求項1記載の誘電体膜の形成方法。
- 該窒化物形成ガスが、アンモニア(NH3)、一酸化窒素(NO)、及び亜酸化窒素(N2O)のいずれか1つを含んでいる、請求項1記載の誘電体膜の形成方法。
- 該誘電体膜が二酸化シリコン(SiO2)である、請求項1記載の誘電体膜の形成方法。
- 該窒素が取込まれた後、オキシ窒化ケイ素が形成される、請求項1記載の誘電体膜の形成方法。
- ゲートスタックの形成方法であって、
基板上に二酸化シリコン膜を形成するステップと、
急速加熱アニールプロセスと窒化物形成ガスを用いて窒素を該二酸化シリコンに取込むステップであって、該急速加熱アニールプロセスでの処理温度は900−1100℃の範囲にあり、処理時間は10−45秒間であって、該急速加熱アニールプロセスが10Torr以下で生じ、該窒素の取込みによって該基板上にオキシ窒化ケイ素膜が形成する、前記ステップと、
該二酸化シリコン膜に取込まれるべき窒素が5%以上の窒素濃度で該オキシ窒化ケイ素を形成するのに十分な時間、窒化物形成ガスで該急速加熱アニールプロセスを続けるステップと、
該オキシ窒化ケイ素上にキャップ層を形成するステップと、
を含み、
前記誘電体膜は、該誘電体膜の上面に存在する窒素濃度ピークを生じる前記窒素を含む、前記方法。 - 該オキシ窒化ケイ素が形成された後に、該オキシ窒化ケイ素をポストアニールプロセスに供するステップであって、該ポストアニールプロセスが1000−1100℃の温度で生じる、前記ステップを更に含む、請求項7記載のゲートスタックの形成方法。
- 該ポストアニールプロセスが、5Torr以下の圧力で生じる、請求項8記載のゲートスタックの形成方法。
- 誘電体膜の形成方法であって、
窒化物形成ガスと急速加熱アニールプロセスを用いて窒素を二酸化シリコン膜に取込むステップであって、該急速加熱アニールプロセスでの処理温度は900−1100℃の範囲にあり、処理時間は10−45秒間であって、該急速加熱アニールプロセスに10Torr以下の圧力が用いられ、
該誘電体膜への該窒素の取込みによってオキシ窒化ケイ素膜が形成される、前記ステップと、
十分量の窒素が該二酸化シリコン膜に取込まれた後、該オキシ窒化ケイ素膜をポストアニールするステップと、
を含み、
前記誘電体膜は、該誘電体膜の上面に存在する窒素濃度ピークを生じる前記窒素を含む、前記方法。 - 該二酸化シリコン膜に取込まれた該窒素の窒素濃度が5%以上である、請求項10記載の誘電体膜の形成方法。
- 該二酸化シリコン膜が12オングストローム以下である、請求項10記載の誘電体膜の形成方法。
- 該窒化物形成ガスが、アンモニア(NH3)、一酸化窒素(NO)、及び亜酸化窒素(N2O)のいずれか1つを含んでいる、請求項10記載の誘電体膜の形成方法。
- 該二酸化シリコン膜を形成するステップを更に含む、請求項10記載の誘電体膜の形成方法。
- ゲートスタックの形成方法であって、
基板をクラスタツールの第一処理チャンバに入れ、該クラスタツールが複数の処理チャンバを有するステップと、
該第一処理チャンバ内でシリコンウエハ上に二酸化シリコン膜を形成するステップと、
真空を破壊せずに、該基板を該第一処理チャンバから第二処理チャンバへ搬送し、該第二処理チャンバが減圧で急速加熱アニールプロセスを作動させることができるステップであって、該急速加熱アニールプロセスでの処理温度は900−1100℃の範囲にあり、処理時間は10−45秒間であって、
該第二処理チャンバの圧力を10Torr以下で維持しつつ該第二処理チャンバに窒化物形成ガスを導入してオキシ窒化ケイ素膜を形成するステップと、
該二酸化シリコンに取込まれるべき窒素が5%以上の窒素濃度まで十分な時間、該窒化物形成ガスを該第二処理チャンバへ続けるステップと、
を含み、
前記誘電体膜は、該誘電体膜の上面に存在する窒素濃度ピークを生じる前記窒素を含む、前記方法。 - 該オキシ窒化ケイ素が形成された後、該基板をポストアニールプロセスに供するステップであって、該ポストアニールプロセスが1000−1100℃の温度で生じる、前記ステップを含む、請求項15記載のゲートスタックの形成方法。
- 該ポストアニールプロセスが第三処理チャンバ内で生じる、請求項16記載のゲートスタックの形成方法。
- 該ポストアニールプロセスが5Torrの圧力で生じる、請求項16記載のゲートスタックの形成方法。
- 誘電体膜の処理方法であって、
該誘電体膜を窒化物形成ガスに10Torr以下の圧力で晒すステップと、
該誘電体膜を該窒化物形成ガスに晒している間、該誘電膜を急速加熱アニールプロセスに供して窒素を該誘電体膜に取込み、オキシ窒化ケイ素膜を形成するステップであって、該急速加熱アニールプロセスでの処理温度は900−1100℃の範囲にあり、処理時間は10−45秒間であるステップを、
を含み、
前記誘電体膜は、該誘電体膜の上面に存在する窒素濃度ピークを生じる前記窒素を含む、前記方法。 - 該窒化物形成物質が、アンモニア(NH3)、一酸化窒素(NO)、及び亜酸化窒素(N2O)のいずれか1つを含んでいる、請求項19記載の誘電体膜の処理方法。
- 該誘電体膜が二酸化シリコン(SiO2)である、請求項19記載の誘電体膜の処理方法。
- 該窒素が取込まれた後、オキシ窒化ケイ素が形成される、請求項19記載の誘電体膜の処理方法。
- 該オキシ窒化ケイ素が形成された後、該オキシ窒化シリコンをポストアニールプロセスに供するステップであって、該ポストアニールプロセスが1000−1100℃の温度で生じる、前記ステップ、
を更に含む、請求項22記載の誘電体膜の処理方法。 - 該ポストアニールプロセスが5Torr以下の圧力で生じる、請求項23記載の誘電体膜の処理方法。
- 該誘電体膜を該急速加熱アニールプロセスに供することが、少なくとも5%の窒素濃度が該誘電体膜に取込まれるまで続けられる、請求項19記載の誘電体膜の処理方法。
- 該オキシ窒化ケイ素膜をポストアニールプロセスに供するステップであって、所望の窒素濃度が該誘電体膜に取込まれた後、該オキシ窒化ケイ素が非窒化物形成雰囲気中でポストアニールされる、前記ステップを更に含む、請求項20記載の誘電体膜の処理方法。
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