JP5822326B1 - 半導体装置の製造方法、及び、半導体装置 - Google Patents
半導体装置の製造方法、及び、半導体装置 Download PDFInfo
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- JP5822326B1 JP5822326B1 JP2015520734A JP2015520734A JP5822326B1 JP 5822326 B1 JP5822326 B1 JP 5822326B1 JP 2015520734 A JP2015520734 A JP 2015520734A JP 2015520734 A JP2015520734 A JP 2015520734A JP 5822326 B1 JP5822326 B1 JP 5822326B1
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Abstract
Description
すなわち、3つのマスクを用いてシリコン柱、平面状シリコン層、ゲート配線を形成している。
102.第1のレジスト
103.フィン状シリコン層
104.第1の絶縁膜
105.第2の絶縁膜
106.第1のポリシリコン
106a.第1のダミーゲート
107.第3の絶縁膜
107a.第1のハードマスク
108.第2のレジスト
109.柱状シリコン層
110.第4の絶縁膜
113.第2のポリシリコン
113a.第2のダミーゲート
114.第6の絶縁膜
114a.第2のハードマスク
115.第5の絶縁膜
115a.サイドウォール
116.第2の拡散層
117.金属と半導体の化合物
118.コンタクトストッパ膜
119.層間絶縁膜
120.第1のゲート絶縁膜
120a.第1のゲート絶縁膜
121.第1の金属
121a.ゲート電極
121b.ゲート配線
122.第2のゲート絶縁膜
122a.第2のゲート絶縁膜
123.第3のレジスト
124.第2の金属
124a.コンタクト線
124b.第1のコンタクト
124c.第2のコンタクト
125.第4のレジスト
126.コンタクト孔
127.第3の金属
127a.金属配線
127b.金属配線
127c.金属配線
128.第3のコンタクト
129.第5のレジスト
130.第5のレジスト
131.第5のレジスト
Claims (13)
- 半導体基板上にフィン状半導体層を形成し、前記フィン状半導体層の周囲に第1の絶縁膜を形成する第1工程と、
前記第1工程の後、
前記フィン状半導体層の周囲に第2の絶縁膜を形成し、
前記第2の絶縁膜の上に第1のポリシリコンを堆積し平坦化し、前記第1のポリシリコン上に第3の絶縁膜を形成し、
ゲート配線と柱状半導体層を形成するための第2のレジストを、前記フィン状半導体層の方向に対して垂直の方向に形成し、
前記第3の絶縁膜と前記第1のポリシリコンと前記第2の絶縁膜と前記フィン状半導体層をエッチングすることにより、柱状半導体層と前記第1のポリシリコンによる第1のダミーゲートと前記第3の絶縁膜による第1のハードマスクとを形成する第2工程と、
前記第2工程の後、前記柱状半導体層と前記第1のダミーゲートの周囲に第4の絶縁膜を形成し、前記第4の絶縁膜の周囲に第2のポリシリコンを堆積し平坦化し、エッチバックし、前記第1のハードマスクを露出し、第6の絶縁膜を堆積し、エッチングすることにより、前記第1のハードマスクの側壁に、第2のハードマスクを形成し、前記第2のポリシリコンをエッチングすることにより、前記第1のダミーゲートと前記柱状半導体層の側壁に残存させ、第2のダミーゲートを形成する第3工程と、
前記第3工程の後、前記第2のダミーゲートの周囲に、サイドウォール状に残存させ、第5の絶縁膜からなるサイドウォールを形成し、前記フィン状半導体層上部と前記柱状半導体層下部に第2の拡散層を形成し、前記第2の拡散層上に金属と半導体の化合物を形成する第4工程と、
前記第4工程の後、層間絶縁膜を堆積し、前記第2のダミーゲートと前記第1のダミーゲートの上部を露出し、前記第2のダミーゲートと前記第1のダミーゲートを除去し、第1のゲート絶縁膜を前記柱状半導体層の周囲と前記第5の絶縁膜の内側に形成し、第1の金属を堆積し、ゲート電極及びゲート配線を形成する第5工程と、
前記第5工程の後、前記柱状半導体層周囲と前記ゲート電極と前記ゲート配線上に第2のゲート絶縁膜を堆積し、前記ゲート配線上の一部の前記第2のゲート絶縁膜を除去し、第2の金属を堆積し、エッチバックを行い、前記柱状半導体層上の前記第2のゲート絶縁膜を除去し、第3の金属を堆積し、前記第3の金属と前記第2の金属の一部をエッチングすることで、第2の金属が前記柱状半導体層上部側壁を取り囲む第1のコンタクトと、前記第1のコンタクトの上部と前記柱状半導体層上部とは接続され、前記ゲート配線上に形成された前記第2の金属からなる第2のコンタクトを形成する第6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。 - 前記第2のダミーゲートの上面の面積は、前記第2のダミーゲートの下面の面積より大きい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。
- 前記第2工程は、
前記フィン状半導体層の周囲に第2の絶縁膜を形成し、
前記第2の絶縁膜の上に前記第1のポリシリコンを堆積し平坦化し、
前記ゲート配線と前記柱状半導体層を形成するための第2のレジストを、前記フィン状半導体層の方向に対して垂直の方向に形成し、
前記第1のポリシリコンと前記第2の絶縁膜と前記フィン状半導体層をエッチングすることにより、前記柱状半導体層と前記第1のポリシリコンによる前記第1のダミーゲートを形成する、
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。 - 前記第4工程は、前記第2のダミーゲートの周囲に、前記第5の絶縁膜を形成し、エッチングをし、サイドウォール状に残存させ、前記第5の絶縁膜からなるサイドウォールを形成し、前記フィン状半導体層上部と前記柱状半導体層下部に前記第2の拡散層を形成し、前記第2の拡散層上に前記金属と半導体の化合物を形成する、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。
- 前記第5工程は、層間絶縁膜を堆積し化学機械研磨し、前記第2のダミーゲートと前記第1のダミーゲートの上部を露出し、前記第2のダミーゲートと前記第1のダミーゲートを除去し、前記第2の絶縁膜と前記第4の絶縁膜を除去し、第1のゲート絶縁膜を前記柱状半導体層の周囲と前記第5の絶縁膜の内側に形成し、第1の金属を堆積し、エッチバックを行い、前記ゲート電極及び前記ゲート配線を形成する、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。
- 前記第4工程の後、コンタクトストッパ膜を堆積することをさらに有する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。
- 前記第5工程の後、前記第1のゲート絶縁膜を除去する工程をさらに有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。
- 前記第1のコンタクトの金属の仕事関数は、4.0eVから4.2eVの間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。
- 前記第1のコンタクトの金属の仕事関数は、5.0eVから5.2eVの間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。
- 半導体基板上に形成されたフィン状半導体層と、
前記フィン状半導体層の周囲に形成された第1の絶縁膜と、
前記フィン状半導体層上に形成された柱状半導体層と、
前記柱状半導体層の周囲に形成された第1のゲート絶縁膜と、
前記第1のゲート絶縁膜の周囲に形成された金属からなるゲート電極と、
前記ゲート電極に接続された前記フィン状半導体層に直交する方向に延在する金属からなるゲート配線と、
前記ゲート電極と前記ゲート配線の周囲と底部に形成された前記第1のゲート絶縁膜と、
前記フィン状半導体層の上部と前記柱状半導体層の下部に形成された第2の拡散層と、
前記柱状半導体層の上部側壁の周囲に形成された第2のゲート絶縁膜と、
前記第2のゲート絶縁膜の周囲に形成された第2の金属からなる第1のコンタクトと、
を有し、
前記ゲート電極と前記ゲート配線の上面の面積は前記ゲート電極と前記ゲート配線の下面の面積より大きく、前記第1のコンタクトの上部と前記柱状半導体層上部とが電気的に接続されている、ことを特徴とする半導体装置。 - 前記ゲート配線上に形成された前記第2の金属からなる第2のコンタクトをさらに有することを特徴とする請求項10に記載の半導体装置。
- 前記第1のコンタクトの第2の金属の仕事関数は、4.0eVから4.2eVの間であることを特徴とする請求項10に記載の半導体装置。
- 前記第1のコンタクトの第2の金属の仕事関数は、5.0eVから5.2eVの間であることを特徴とする請求項10に記載の半導体装置。
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