JP2010278312A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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Abstract
【解決手段】ゲート幅方向端部Eの活性領域14の幅を、ゲート幅方向中央部より広く形成することによりフィールド酸化膜コーナー部19を、ゲート幅方向端部Eに形成されたP型ボディ層4からゲート幅方向端部の外側に遠ざける。これにより、デバイス面積を拡大することなく、P型ボディ層4から、フィールド酸化膜コーナー部19の近傍に形成される高濃度N型ドリフト層5を遠ざける事ができる。
【選択図】図1
Description
本発明の第1の実施形態に係るDMOSトランジスタについて、図1、図2を参照して説明する。なお、本実施形態のDMOSトランジスタは、低電圧動作のNチャネル型DMOSトランジスタ(LDMOSトランジスタ)であり、以降、DMOSトランジスタ100と表示して説明する。図1(A)は本発明のDMOSトランジスタ100の平面図である。後述する比較例に示す図18(A)との相違点は、フィールド酸化膜端部13を示す点線部が、ゲート幅方向端部Eからり外側に向かって遠ざかっている点である。なお、フィールド酸化膜10とはLOCOSからなる素子分離膜である。図1(A)では、フィールド酸化膜端部13が、ゲート幅方向端部Eから外側に矩形上に広がっている様子が観察できる。図1(B)に示す、図1(A)のA−A切断面での断面図は比較例と同じである。それに対して、図1(C)に示す、B−B切断面での断面図は比較例と異なり、フィールド酸化膜端部13及びN型ドリフト層5がP型ボディ層4から離れた位置に形成されている。即ち、比較例と比べた場合、フィールド酸化膜コーナー部19が、P型ボディ層4から離れた位置に形成されている点である。
それでは、第1の実施形態に係る発明に至った理由を以下に比較例を示して説明する。チャネル層を含むP型ボディ層4を取り囲むフィールド酸化膜10の下に、同様にP型ボディ層4を取り囲むN型ドリフト層5を配置する構成をとるオフセットドレイン構造の高耐圧MOS型トランジスタ(DMOSトランジスタ300)について、N型ドリフト層5の不純物濃度を、オン抵抗と耐圧の点からバランスを取って設定したにもかかわらず、十分な耐圧が得られなかった。原因解析の結果、ゲート幅方向端部において耐圧劣化が生じることを発見するに至った。現象としては、フィールド酸化膜コーナー部19近傍の活性領域14で発光し、その部分で耐圧が劣化している事が判明した。
第2の実施形態に係るDMOSトランジスタは、高電圧動作のNチャネル型DMOSトランジスタ(HMOSトランジスタ)であり、ゲート電極にドレイン電極と同じ高電圧を印加するものに関する。以降、DMOSトランジスタ200と表示して、図14、図15を参照して説明を進める。DMOSトランジスタ200も通常のDMOSトランジスタ100と基本的には同じ構成を採っている。図14AはDMOSトランジスタ200の平面図である。図14(B)は図14(A)の平面図のA−A切断面、図14(C)はB−B切断面で示した断面図である。なお、第1の実施形態と同一の構成については、原則、同一の符号を用いて説明する。
従って、これらの対策はDMOSトランジスタ200の高耐圧化に大きく貢献する。
4a、4b、4 P型ボディ層 5 N型ドリフト層 6 N型ウエル層
7 N+型ソース層 8 N+型ドレイン層 9 P+型コンタクト層
10 フィールド酸化膜 11 ゲート絶縁膜 12 ゲート電極
13 フィールド酸化膜端部 14 活性領域 15 厚膜ゲート絶縁膜
16 ゲート電極載置用絶縁膜 17 ソース電極 18 ドレイン電極
19 フィールド酸化膜コーナー部 20 P型電子蓄積防止層
E ゲート幅方向端部 21、26 層間絶縁膜
22、23、24 コンタクトホール 25 N+型蓄積層
32 ゲート引き出し電極 71 酸化膜 72 窒化膜
81、82、83、84、85、86、87 レジスト
100、200、300 DMOSトランジスタ
Claims (5)
- 第1導電型の半導体層と、
前記半導体層の表面に形成され、活性領域を分離する素子分離層と、
前記活性領域の表面に形成されたチャネル領域を含む第2導電型のボディ層と、
前記ボディ層内に形成された第1導電型のソース層と、
前記半導体層上に形成されたゲート絶縁膜と、
前記チャネル領域上を含む前記半導体層上に、前記ゲート絶縁膜を介して形成されたゲート電極と、
前記半導体層に形成された第1導電型のドリフト層と、
前記ソース層と対向して前記ドリフト層の表面に形成された第1導電型のドレイン層と、
を備え、
前記活性領域は、そのゲート幅方向の中央よりも端部側において、該活性領域の幅が広く形成されていることを特徴とする半導体装置。 - 前記ドリフト層が前記ボディ層を取り囲む前記素子分離層の下に形成され、前記ゲート電極が前記ソース層の端部から前記ゲート絶縁膜を介し前記素子分離層上まで延在して形成されたことを特徴とする請求項1に記載の半導体装置。
- 前記ゲート絶縁膜が、前記ゲート幅方向の端部及びその外側で、ゲート中心部の前記ゲート絶縁膜より厚く形成されていることを特徴とする請求項1または請求項2に記載の半導体装置。
- 前記ゲート電極が前記ソース層を囲むように環状に形成されていることを特徴とする請求項1乃至請求項3のいずれかに記載の半導体装置。
- 前記ゲート幅方向の端部及びその外側に形成された前記素子分離層に囲まれた領域の一部に、第2導電型のコンタクト層上から前記ゲート絶縁膜を介して延在するゲート電極を載置するゲート電極載置用絶縁膜と、該ゲート電極載置用絶縁膜の下に第2導電型の電子蓄積防止層が形成されていることを特徴とする請求項4に記載の半導体装置。
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JP2009130736A JP2010278312A (ja) | 2009-05-29 | 2009-05-29 | 半導体装置 |
US12/787,052 US8525259B2 (en) | 2009-05-29 | 2010-05-25 | Semiconductor device |
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