JP5268829B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP5268829B2 JP5268829B2 JP2009191697A JP2009191697A JP5268829B2 JP 5268829 B2 JP5268829 B2 JP 5268829B2 JP 2009191697 A JP2009191697 A JP 2009191697A JP 2009191697 A JP2009191697 A JP 2009191697A JP 5268829 B2 JP5268829 B2 JP 5268829B2
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Description
図10は、Alキャップ膜の膜厚を変化させて、HfSiO膜及びHfSiON膜の各々にAlを拡散させた場合の、フラットバンド電圧の変化量(ΔVfb)と酸化膜換算膜厚の変化量(ΔEOT)との関係を示す図である。
図11(a) は、ゲート絶縁膜における高誘電率膜の窒素濃度とn型MISトランジスタの実効仕事関数との関係を示す図である。図11(b) は、ゲート絶縁膜における高誘電率膜の窒素濃度と該高誘電率膜の酸化膜換算膜厚との関係を示す図である。
本発明の第1の実施形態に係る半導体装置及びその製造方法について図面を参照しながら説明する。
本発明の第2の実施形態に係る半導体装置及びその製造方法について図面を参照しながら説明する。なお、第2の実施形態に係る半導体装置及びその製造方法について、第1の実施形態に係る半導体装置及びその製造方法と相違する点を中心に説明し、共通する点については適宜省略して説明する。
本発明の第3の実施形態に係る半導体装置及びその製造方法について図面を参照しながら説明する。なお、第3の実施形態に係る半導体装置及びその製造方法について、第1の実施形態に係る半導体装置及びその製造方法と相違する点を中心に説明し、共通する点については適宜省略して説明する。
本発明の第1の実施形態の変形例に係る半導体装置及びその製造方法について図面を参照しながら説明する。なお、第1の実施形態の変形例に係る半導体装置及びその製造方法について、第1の実施形態に係る半導体装置及びその製造方法と相違する点を中心に説明し、共通する点については適宜省略して説明する。
10a 第1の活性領域
10b 第2の活性領域
11 素子分離領域
12a p型ウェル領域
12b n型ウェル領域
13 下地膜
13a 第1の下地膜
13b 第2の下地膜
14 高誘電率膜
14X 窒素を含む高誘電率膜
14Y Laを含む高誘電率膜
14Z La及び窒素を含む高誘電率膜
14M 窒素を含む高誘電率膜
14N 窒素を含む高誘電率膜
14Xa 窒素を含む第1の高誘電率膜
14Za La及び窒素を含む第1の高誘電率膜
14Na 窒素を含む第1の高誘電率膜
14b 第2の高誘電率膜
14Mb 窒素を含む第2の高誘電率膜
14x Alを含む第2の高誘電率膜
14Mx 窒素及びAlを含む第2の高誘電率膜
14y Al及び窒素を含む第2の高誘電率膜
14A 第1のゲート絶縁膜
14B 第2のゲート絶縁膜
15,15b 第1の調整用金属膜
15X,15Xb 窒素を含む第1の調整用金属膜
16 保護膜
17 金属膜
17a 第1の金属膜
17b 第2の金属膜
18 シリコン膜
18a 第1のシリコン膜
18b 第2のシリコン膜
18F ゲート電極形成膜
18A 第1のゲート電極
18B 第2のゲート電極
19a 第1のオフセットスペーサ
19b 第2のオフセットスペーサ
20a 浅いn型ソースドレイン領域
20b 浅いp型ソースドレイン領域
21a 第1の内側サイドウォール
21b 第2の内側サイドウォール
22a 第1の外側サイドウォール
22b 第2の外側サイドウォール
22A 第1のサイドウォール
22B 第2のサイドウォール
23a 深いn型ソースドレイン領域
23b 深いp型ソースドレイン領域
24a 第1の金属シリサイド膜
24b 第2の金属シリサイド膜
25a 第3の金属シリサイド膜
25b 第4の金属シリサイド膜
26 絶縁膜
27 層間絶縁膜
28a 第1のコンタクトホール
28b 第2のコンタクトホール
29a 第1のコンタクトプラグ
29b 第2のコンタクトプラグ
30 第2の調整用金属膜
Re レジストパターン
Claims (15)
- 第1のMISトランジスタと第2のMISトランジスタとを備えた半導体装置であって、
前記第1のMISトランジスタは、
半導体基板における第1の活性領域上に形成され、第1の高誘電率膜を有する第1のゲート絶縁膜と、
前記第1のゲート絶縁膜上に形成された第1のゲート電極とを備え、
前記第2のMISトランジスタは、
前記半導体基板における第2の活性領域上に形成され、前記第1の高誘電率膜と同一の高誘電体材料からなる第2の高誘電率膜を有する第2のゲート絶縁膜と、
前記第2のゲート絶縁膜上に形成された第2のゲート電極とを備え、
前記第2の高誘電率膜は、第1の調整用金属を含み、
前記第1の高誘電率膜は、前記第2の高誘電率膜よりも窒素濃度が高く、且つ、前記第1の調整用金属を含まず、
前記第2の高誘電率膜中における前記第1の調整用金属の濃度は、上面から下面に向かって低くなっていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置において、
前記第1の高誘電率膜は窒素を含む一方、前記第2の高誘電率膜は前記窒素を含まないことを特徴とする半導体装置。 - 請求項1又は2に記載の半導体装置において、
前記第1の調整用金属は、アルミニウムであることを特徴とする半導体装置。 - 請求項1〜3のうちいずれか1項に記載の半導体装置において、
前記第1の高誘電率膜中における前記窒素濃度は、上面から下面に向かって低くなっていることを特徴とする半導体装置。 - 請求項1〜4のうちいずれか1項に記載の半導体装置において、
前記窒素濃度の分布は、前記第1の活性領域にまで到達していることを特徴とする半導体装置。 - 請求項1〜5のうちいずれか1項に記載の半導体装置において、
前記第1の高誘電率膜は第2の調整用金属を含む一方、前記第2の高誘電率膜は前記第2の調整用金属を含まないことを特徴とする半導体装置。 - 請求項6に記載の半導体装置において、
前記第2の調整用金属は、ランタンであることを特徴とする半導体装置。 - 請求項6又は7に記載の半導体装置において、
前記第1の高誘電率膜中における前記第2の調整用金属の濃度は、上面から下面に向かって低くなっていることを特徴とする半導体装置。 - 請求項1〜8のうちいずれか1項に記載の半導体装置において、
前記第1のゲート絶縁膜は、前記第1の活性領域上に形成された第1の下地膜と、前記第1の下地膜上に形成された前記第1の高誘電率膜とからなり、
前記第2のゲート絶縁膜は、前記第2の活性領域上に形成された第2の下地膜と、前記第2の下地膜上に形成された前記第2の高誘電率膜とからなることを特徴とする半導体装置。 - 請求項9に記載の半導体装置において、
前記第1の下地膜及び前記第2の下地膜は、シリコン酸化膜からなることを特徴とする半導体装置。 - 請求項1〜10のうちいずれか1項に記載の半導体装置において、
前記第1の高誘電率膜及び前記第2の高誘電率膜は、比誘電率が10以上の金属酸化物からなることを特徴とする半導体装置。 - 請求項1〜11のうちいずれか1項に記載の半導体装置において、
前記第1のゲート電極は、前記第1のゲート絶縁膜上に形成された第1の金属膜と、前記第1の金属膜上に形成された第1のシリコン膜とからなり、
前記第2のゲート電極は、前記第2のゲート絶縁膜上に形成された第2の金属膜と、前記第2の金属膜上に形成された第2のシリコン膜とからなることを特徴とする半導体装置。 - 請求項1〜12のうちいずれか1項に記載の半導体装置において、
前記第1のゲート電極の側面上に形成された断面形状がL字状の第1のサイドウォールと、
前記第2のゲート電極の側面上に形成された断面形状がL字状の第2のサイドウォールと、
前記第1の活性領域及び前記第2の活性領域上に、前記第1のゲート電極及び前記第1のサイドウォール、並びに前記第2のゲート電極及び前記第2のサイドウォールを覆うように形成された絶縁膜とをさらに備えていることを特徴とする半導体装置。 - 請求項13に記載の半導体装置において、
前記絶縁膜は、前記第1の活性領域におけるチャネル領域のゲート長方向に引っ張り応力を生じさせる応力絶縁膜であり、
前記絶縁膜は、前記第1のサイドウォールの表面に接して形成されていることを特徴とする半導体装置。 - 請求項1〜14のうちいずれか1項に記載の半導体装置において、
前記第1のMISトランジスタは、n型MISトランジスタであり、
前記第2のMISトランジスタは、p型MISトランジスタであることを特徴とする半導体装置。
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| US13/396,833 US20120139055A1 (en) | 2009-08-21 | 2012-02-15 | Semiconductor device |
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