JP7316746B2 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- JP7316746B2 JP7316746B2 JP2017049245A JP2017049245A JP7316746B2 JP 7316746 B2 JP7316746 B2 JP 7316746B2 JP 2017049245 A JP2017049245 A JP 2017049245A JP 2017049245 A JP2017049245 A JP 2017049245A JP 7316746 B2 JP7316746 B2 JP 7316746B2
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Description
本発明にかかる半導体装置について、SJ-MOSFETを例に説明する。図1は、実施の形態にかかるSJ-MOSFETの構造を示す断面図である。図1には、2つの単位セル(素子の機能単位)のみを示し、これらに隣接する他の単位セルを図示省略する。図1に示すSJ-MOSFETは、シリコンからなる半導体基体(シリコン基体:半導体チップ)のおもて面(p型ベース層7側の面)側にMOS(Metal Oxide Semiconductor)ゲートを備えたSJ-MOSFETである。このSJ-MOSFETは、活性部20と、活性部20の周囲を囲む終端構造部30と、を備える。活性部20は、オン状態のときに電流が流れる領域である。終端構造部30は、ドリフト領域の基体おもて面側の電界を緩和し耐圧を保持する領域である。
次に、実施の形態にかかる半導体装置の製造方法について説明する。図2~7は、実施の形態にかかるSJ-MOSFETの製造途中の状態を示す断面図である。まず、シリコンからなりn+型ドレイン層1となるn+型半導体基板を用意する。次に、n+型ドレイン層1のおもて面上に、エピタキシャル成長とイオン注入を繰り返し行い、n型カラム領域2とp型カラム領域3からなるSJ構造を形成する。ここまでの状態が図2に記載される。なお、n型カラム領域2およびp型カラム領域3が設けられない領域が、n型ドリフト層50となる。また、SJ構造は、n+型ドレイン層1のおもて面上にn型ドリフト層50をエピタキシャル成長で形成し、n型ドリフト層50の上面からp型カラム領域3を形成する位置にトレンチを形成してp型カラム領域3を形成する半導体層をトレンチの内部に埋め込んでもよい。
2 n型カラム領域
3 p型カラム領域
4 ドレイン電極
5 ゲート絶縁膜
6 ゲート電極
7 p型ベース層
8 n型ソース領域
9 層間絶縁膜
10 p+型コンタクト領域
11 ソース電極
12 p型リサーフ領域
13 p型ウェル領域
14 絶縁膜
15 ゲート配線
16 LOCOS酸化膜
17 ゲートメタル
18 レジスト
19 プラズマ
20 活性部
21 n+型半導体基板
22 n-型ドリフト層
23 p型コレクタ層
24 n型エミッタ領域
25 エミッタ電極
26 コレクタ電極
30 終端構造部
40 矢印
50 n型ドリフト層
51,52,53 トレンチ
A トレンチゲート
B トレンチコンタクト
C ゲートコンタクト
Claims (8)
- 第1導電型の半導体基板と、
前記半導体基板の第1主面上に設けられた第1導電型のドリフト層と、
前記ドリフト層の表面層に設けられた第2導電型の第1半導体層と、を備え、
前記第1半導体層の表面から前記ドリフト層に達するトレンチと、前記トレンチの内部にゲート絶縁膜を介して設けられたゲート電極と、ソース電極と接続するトレンチコンタクトと、を有する主電流が流れる活性領域と、
前記ゲート電極と接続されたゲート金属が接触するゲートコンタクトを有する、前記活性領域の周囲を囲む終端領域と、を備え、
前記終端領域は、
前記第1半導体層と接続し、前記ゲートコンタクトの底部まで延在する第2導電型の第1半導体領域を有し、
前記第1半導体領域は、前記ドリフト層の表面層に設けられ、前記ドリフト層の表面に近いほど不純物濃度が高く、
前記第1半導体領域上に設けられたLOCOS酸化膜と、
前記LOCOS酸化膜上に設けられた前記ゲート電極に電気的に接続するポリシリコンからなるゲート配線と、
前記ゲート配線の上面に設けられた層間絶縁膜と、
前記層間絶縁膜および前記ゲート配線を貫通し、前記LOCOS酸化膜に達する前記ゲートコンタクトを備え、
前記ゲートコンタクトの前記底部の下部の前記LOCOS酸化膜の膜厚は前記ゲートコンタクトが設けられない領域における前記LOCOS酸化膜の膜厚より薄く、
前記活性領域の前記終端領域側の最も外側の前記トレンチより外側には、前記トレンチコンタクトが設けられていることを特徴とする半導体装置。 - 前記ゲートコンタクトの前記底部の下部の前記LOCOS酸化膜の膜厚は、前記ゲートコンタクトが設けられない領域における前記LOCOS酸化膜の膜厚より3~15%薄いことを特徴とする請求項1に記載の半導体装置。
- 前記ゲートコンタクトの前記底部の下部の前記第1半導体領域の膜厚は、1.4μm以上2.0μm以下であることを特徴とする請求項1または2に記載の半導体装置。
- 前記ゲートコンタクトが設けられた領域における前記第1半導体領域の不純物濃度は、5×1016/cm3以上1×1017/cm3以下であることを特徴とする請求項1~3のいずれか一つに記載の半導体装置。
- 前記ゲートコンタクトの前記終端領域側の側面と前記第1半導体領域の前記終端領域側の端部との間の距離は3.5μm以上であることを特徴とする請求項1~4のいずれか一つに記載の半導体装置。
- 前記ドリフト層には第1導電型の第1カラムと第2導電型の第2カラムが前記第1主面上に前記第1主面に平行な方向に繰り返し交互に配置されていることを特徴とする請求項1に記載の半導体装置。
- 第1導電型の半導体基板と、前記半導体基板の第1主面上に配置された第1導電型のドリフト層と、前記ドリフト層のおもて面に設けられた主電流が流れる活性領域と、前記活性領域の周囲を囲む終端領域と、を備える半導体装置の製造方法であって、
前記終端領域の前記ドリフト層の表面層に第2導電型の第1半導体領域を形成するイオン注入を行う第1工程と、
前記第1工程後に前記終端領域の第1半導体領域と前記終端領域の前記ドリフト層の表面にLOCOS酸化膜を形成する第2工程と、
前記活性領域の前記ドリフト層の表面から前記第1主面に垂直な方向にトレンチを形成する第3工程と、
前記第3工程後に前記ドリフト層の上面全体にゲート絶縁膜を形成する第4工程と、
前記第4工程後にゲート絶縁膜の上面全体にポリシリコンを堆積する第5工程と、
前記第5工程後に前記トレンチ内のゲート電極を形成し、前記終端領域のゲート配線を
前記ポリシリコンで形成する第6工程と、
前記第6工程後に前記活性領域の前記ドリフト層の表面層に第2導電型のウェル領域を形成する第7工程と、
前記ウェル領域の表面層に第1導電型のソース領域を形成する第8工程と、
前記第8工程後に前記ドリフト層の上面全体に層間絶縁膜を形成する第9工程と、
前記層間絶縁膜の一部を除去して前記ゲート電極と接続された前記ゲート配線がゲート金属と接するゲートコンタクトを形成する第10工程と、
前記層間絶縁膜の一部と前記ウェル領域の一部を除去してソース電極と接続されたトレンチコンタクトを形成する第11工程と、を有し、
前記第1工程では、前記第1半導体領域を前記ゲートコンタクトが設けられる領域まで延在させ、前記ドリフト層の表面に近いほど不純物濃度を高く形成し、
前記第10工程では、前記層間絶縁膜および前記ゲート配線を貫通し、前記LOCOS酸化膜に達する前記ゲートコンタクトを形成し、前記ゲートコンタクトの底部の下部の前記LOCOS酸化膜の膜厚は前記ゲートコンタクトが設けられない領域における前記LOCOS酸化膜の膜厚より薄くし、
前記第11工程では、前記活性領域の前記終端領域側の最も外側の前記トレンチより外側に前記トレンチコンタクトを形成することを特徴とする半導体装置の製造方法。 - 前記第10工程と前記第11工程を同時に行い、前記トレンチコンタクトを前記ゲートコンタクトと同時に形成することを特徴とする請求項7に記載の半導体装置の製造方法。
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