JP5629994B2 - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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Description
(半導体装置1Aの構成)
図1は、第1実施形態の半導体装置1Aの構成を説明するための図である。ここでは、図1(a)は半導体装置1Aの概略構成を模式的に示すXY平面図、図1(b)は図1(a)におけるA−A’線のYZ断面図である。いずれも模式図面であり、この図面の寸法に限定されるものではなく、このことは他の実施形態でも同様である。なお、図1(b)においては、後述するn型半導体ピラー領域21、p型半導体ピラー領域22、ゲート電極70、p+型半導体80、リサーフ領域Cの配置の説明を容易にするため、一部の構成は記載していない。
ここで、上記構成により、MOSFETがオフ状態のときの耐圧が向上するメカニズムを説明する。まず、p型半導体ピラー領域22の長手方向(X軸方向)及び深さ方向(Z方向)の現象について説明する。
次に、本実施形態に係る半導体装置1Aの製造方法について図面を参照して具体的に説明する。
次に、第2実施形態に係る半導体装置1Bを説明する。図7は第2実施形態に係る半導体装置1Bを説明するための図である。
次に、第3実施形態に係る半導体装置1Cを説明する。図8は第3実施形態に係る半導体装置1Cを説明するための図である。
次に、第4実施形態に係る半導体装置1Dを説明する。図10は第4実施形態に係る半導体装置1Dを説明するための図である。
10 n型高濃度基体(第1導電型の半導体基板)
21 n型半導体ピラー領域(第1ピラー領域)
22 p型半導体ピラー領域(第2ピラー領域)
23 n型エピタキシャル層(第1導電型の半導体層)
25 トレンチ溝
30 p型半導体領域(第2の半導体領域)
50 ソース領域
52,52’ メタル配線(接続部)
55 チャネルストップ
60 ソース電極
65 ゲート絶縁膜
70 ゲート電極
80 p+型半導体(接続部)
Claims (6)
- 第1導電型の半導体基板と、
前記半導体基板の上面側に形成され、前記半導体基板の上面に対して平行な第1の方向をそれぞれ長手方向とした第1導電型の第1ピラー領域と第2導電型の第2ピラー領域とが、前記半導体基板の上面に対して平行で且つ前記第1の方向と直交する第2の方向に沿って、交互に配置される領域を含む第1の半導体領域と、
前記第2ピラー領域表面に、前記第1ピラー領域に接して形成された第2導電型の第2の半導体領域と、
前記第2の半導体領域上の一部と前記第1ピラー領域上の一部に跨るように、ゲート絶縁膜を介して形成されたゲート電極と、
前記ゲート電極側部下方の前記第2の半導体領域表面の一部に形成された第1導電型のソース領域である第3の半導体領域と、
半導体素子が形成される素子領域を囲む終端領域の一部の領域であって、前記第2の半導体領域上に形成された第2導電型のリサーフ領域と、を備え、
前記素子領域から前記終端領域に亘って形成された前記第2ピラー領域の幅を第1幅とすると共に、前記素子領域に形成された各前記第1ピラー領域の幅及び前記終端領域のリサーフ領域に接続されている各前記第1ピラー領域の幅を第2幅とする一方、
前記終端領域に形成され、かつ前記リサーフ領域に接続されていない第1ピラー領域は、前記第2の方向であって前記終端領域から遠ざかる方向に、前記第2幅より狭い第3幅の第1ピラー領域と、前記第2幅と同幅又は前記第2幅よりも広い第4幅の第1ピラー領域と、を順に交互に配置され、
さらに、前記終端領域に形成され、かつ前記リサーフ領域と接続されていない複数の第2ピラー領域のうち、前記第4幅の第1ピラー領域を挟んで隣接する第2ピラー領域間を、第2導電型の半導体又は導電体からなる接続部により接続した半導体装置。 - 前記接続部が前記リサーフ領域よりも濃度が高い第2導電型の半導体により形成された請求項1に記載の半導体装置。
- 前記接続部がメタル配線により形成された請求項1に記載の半導体装置。
- 前記第1方向において前記接続部の長さと前記リサーフ領域の長さを等しくしており、
前記接続部の前記第1方向の両端に前記リサーフ領域と不純物濃度が等しい第2導電型の半導体領域を形成した請求項1〜3のいずれか1項に記載の半導体装置。 - 前記第1の半導体領域は、前記半導体基板の上面に形成された第1導電型の半導体層に複数のトレンチ溝を形成して当該トレンチ溝間に前記第1ピラー領域が形成され、各前記トレンチ溝に第2導電型の半導体をエピタキシャル成長により埋め込んで前記第2ピラー領域が形成されている請求項1〜4のいずれか1項に記載の半導体装置。
- 第1導電型の半導体基板上に、第1導電型の半導体層を形成する第1工程と、
前記第1導電型の半導体層に、前記半導体基板の上面に対して平行な第1の方向をそれぞれ長手方向としたトレンチ溝を、前記半導体基板の上面に対して平行で且つ前記第1の方向と直交する第2の方向に沿って、間隔を空けて複数形成し、前記トレンチ溝間に第1導電型の第1ピラー領域を複数形成する第2工程と、
各前記トレンチ溝に第2導電型の半導体をエピタキシャル成長により埋め込んで第2導電型の第2ピラー領域を複数形成する第3工程と、
前記第2ピラー領域表面に、前記第1ピラー領域に接して第2導電型の第2の半導体領域を形成する第4工程と、
前記第2の半導体領域上の一部と前記第1ピラー領域上の一部に跨るように、ゲート絶縁膜を介してゲート電極を形成する第5工程と、
前記ゲート電極側部下方の前記第2の半導体領域上の一部に第1導電型のソース領域である第3の半導体領域を形成する第6工程と、
半導体素子が形成される素子領域を囲む終端領域の一部の領域であって、前記第2の半導体領域表面に第2導電型のリサーフ領域を形成する第7工程とを有し、
前記第2工程において、前記素子領域から前記終端領域に亘って形成された前記第2ピラー領域の幅を第1幅とすると共に、前記素子領域に形成された各前記第1ピラー領域の幅及び前記終端領域のリサーフ領域に接続されている各前記第1ピラー領域の幅を第2幅とする一方、前記終端領域に形成され、かつ前記リサーフ領域が表面に形成されていない第1ピラー領域は、前記第2の方向であって前記終端領域から遠ざかる方向に、前記第2幅より狭い第3幅の第1ピラー領域と、前記第2幅と同幅又は前記第2幅よりも広い第4幅の第1ピラー領域と、を順に交互に配置されるように前記トレンチ溝を形成し、
さらに、前記終端領域に形成され、かつ前記リサーフ領域と接続されていない複数の第2ピラー領域のうち、前記第4幅の第1ピラー領域を挟んで隣接する第2ピラー領域間に第2導電型の半導体又は導電体からなる接続部を形成して前記第2ピラー領域間を接続する工程を有する半導体装置の製造方法。
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