JP7139232B2 - 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
実施形態に係る半導体装置を説明する前に、比較例に係る半導体装置を説明する。これにより、実施形態に係る半導体装置を、より明確にする。
次に、実施形態1の半導体装置を説明する。図3(a)は、実施形態1に係る半導体装置のゲート抵抗を例示した平面図であり、(b)は、実施形態1に係る半導体装置のゲート抵抗を例示した断面図であり、(a)のIII-III線の断面を示す。図4(a)は、実施形態1に係る半導体装置を例示した平面図であり、(b)は、実施形態1に係る半導体装置を例示した断面図であり、(a)のIV-IV線の断面を示す。図5(a)は、実施形態1に係る半導体装置の寄生MOSを例示した断面図であり、図4(b)の拡大図を示し、(b)は、寄生MOSの構成の接続関係を例示した図である。図6(a)及び(b)は、実施形態1に係る半導体装置を例示した平面図であり、(b)は、(a)のVI領域を拡大した図である。
本実施形態では、ゲート抵抗20に開口部25を設け、ゲート抵抗20を短冊状に形成する。これにより、ゲート抵抗20の抵抗値を大きくすることができる。よって、第1コンタクト61と第2コンタクト62との間の長さLを小さくすることができ、半導体基板10の主面10aにおいて、ゲート抵抗20が占める面積を削減することができる。したがって、チップサイズの増大を抑制することができる。
次に、実施形態2に係る半導体装置を説明する。本実施形態の半導体装置は、環状のトレンチ電極41の外側の部分にエミッタ配線30を接続し、ゲート抵抗20の下方に、フローティング層が形成されないようにしている。図10(a)は、実施形態2に係る半導体装置を例示した平面図であり、(b)は、実施形態2に係る半導体装置を例示した断面図であり、(a)のX-X線の断面を示す。
次に、実施形態3に係る半導体装置を説明する。本実施形態の半導体装置は、開口部25に寄生MOS81を形成せずに、pボディコンタクト層14のみ形成している。図11(a)は、実施形態3に係る半導体装置を例示した平面図であり、(b)は、実施形態3に係る半導体装置を例示した断面図であり、(a)のXI-XI線の断面を示す。
次に、実施形態4に係る半導体装置を説明する。本実施形態の半導体装置におけるゲート抵抗は、延在部がトレンチ42の内部に形成されている。図12(a)は、実施形態4に係る半導体装置のゲート抵抗を例示した平面図であり、(b)は、実施形態4に係る半導体装置のゲート抵抗を例示した断面図であり、(a)のXII-XII線の断面を示す。図13(a)は、実施形態4に係る半導体装置を例示した平面図であり、(b)は、実施形態4に係る半導体装置を例示した断面図であり、(a)のXIII-XIII線の断面を示す。
次に、実施形態5に係る半導体装置を説明する。本実施形態の半導体装置におけるゲート抵抗20aは、延在部23aがトレンチ42の内部に形成されている。そして、開口部25に寄生MOS81が形成されている。図14(a)は、実施形態5に係る半導体装置を例示した平面図であり、(b)は、実施形態5に係る半導体装置を例示した断面図であり、(a)のXIV-XIV線の断面を示す。
次に、実施形態6に係る半導体装置を説明する。図1に示した比較例の半導体装置101においては、ゲート抵抗120と、その下方のp型拡散層との間を絶縁するために、絶縁膜51が設けられている。しかしながら、絶縁膜51は、ゲート及びエミッタ間に並列接続される容量として働き、ゲート抵抗20の抵抗値を変動させる。
10 半導体基板
10a 主面
10b 裏面
11 n型ドリフト層
12 深いp型拡散層
12a 領域
13 浅いp型拡散層
14 ボディコンタクト層
15 キャリア
16 周辺領域
17 n型ホールバリア層
17a 領域
20 ゲート抵抗
21 第1接続部
22 第2接続部
23 延在部
25 開口部
30 エミッタ配線
40 ゲートパッド
41 トレンチ電極
42 トレンチ
43 トレンチ絶縁膜
44 コンタクト溝
45 ゲート絶縁膜
46 分離層
50 絶縁膜
51 絶縁膜
61 第1コンタクト
62 第2コンタクト
71、72 ゲート配線
80 キャリア排出機構
81 寄生MOS
91 アクティブセル部
92 ゲート抵抗部
101 半導体装置
120 ゲート抵抗
Claims (15)
- 半導体基板の主面側に設けられたゲート抵抗と、
前記主面に平行な面内における一方向に延び、前記面内における前記一方向に直交する他方向に間隔をあけて前記ゲート抵抗の上面に接続された第1コンタクト及び第2コンタクトと、
前記ゲート抵抗の下方の前記半導体基板に形成されたキャリアを排出するキャリア排出機構と、
を備え、
前記ゲート抵抗は、
前記一方向に延び、前記第1コンタクトが接続された第1接続部と、
前記一方向に延び、前記第2コンタクトが接続された第2接続部と、
前記他方向に延び、一端が前記第1接続部に接続し、他端が前記第2接続部に接続した複数の延在部と、
を有し、
前記ゲート抵抗は、隣り合う前記延在部の間に開口部が形成され、
前記ゲート抵抗は、前記第1コンタクトまたは前記第2コンタクトを介して、トランジスタのゲート電極に接続し、
前記キャリア排出機構は、前記開口部に形成され、
前記キャリア排出機構は、
前記主面側から見て前記半導体基板に環状に形成されたトレンチの内部に設けられたトレンチ電極と、
前記半導体基板と前記トレンチ電極との間に形成されたトレンチ絶縁膜と、
前記半導体基板における前記トレンチ電極で囲まれた部分に形成された第1導電型のドリフト層と、
前記ドリフト層上に形成された第2導電型の拡散層と、
前記拡散層上に形成された第2導電型のコンタクト層と、
前記環状の前記トレンチ電極の外側の部分に形成された第2導電型の拡散層と、
前記コンタクト層に接続された配線と、
を有する寄生MOSである、
半導体装置。 - 前記配線は、前記半導体基板に形成された溝を介して前記コンタクト層に接続された、
請求項1に記載の半導体装置。 - 前記配線は、前記トレンチ電極にも接続された、
請求項1に記載の半導体装置。 - 各前記延在部の前記一方向における長さは、前記ゲート抵抗の所定の抵抗値に基づいて決定される、
請求項1に記載の半導体装置。 - 半導体基板の主面側に設けられたゲート抵抗と、
前記主面に平行な面内における一方向に延び、前記面内における前記一方向に直交する他方向に間隔をあけて前記ゲート抵抗の上面に接続された第1コンタクト及び第2コンタクトと、
前記ゲート抵抗の下方の前記半導体基板に形成されたキャリアを排出するキャリア排出機構と、
を備え、
前記ゲート抵抗は、
前記一方向に延び、前記第1コンタクトが接続された第1接続部と、
前記一方向に延び、前記第2コンタクトが接続された第2接続部と、
前記他方向に延び、一端が前記第1接続部に接続し、他端が前記第2接続部に接続した複数の延在部と、
を有し、
前記ゲート抵抗は、隣り合う前記延在部の間に開口部が形成され、
前記ゲート抵抗は、前記第1コンタクトまたは前記第2コンタクトを介して、トランジスタのゲート電極に接続し、
前記キャリア排出機構は、前記開口部に形成され、
前記キャリア排出機構は、
前記主面側から見て前記半導体基板に環状に形成されたトレンチの内部に設けられたトレンチ電極と、
前記半導体基板と前記トレンチ電極との間に形成されたトレンチ絶縁膜と、
前記環状の前記トレンチ電極の外側の部分に形成された第2導電型の拡散層と、
前記拡散層上に形成された第2導電型のコンタクト層と、
前記コンタクト層に接続された配線と、
を有する、
半導体装置。 - 前記配線は、前記トレンチ電極の前記外側に沿って、前記半導体基板に形成された環状の溝を介して前記コンタクト層に接続された、
請求項5に記載の半導体装置。 - 隣り合う前記延在部の間隔は、前記ゲート抵抗の所定の抵抗値に基づいて決定される、
請求項1に記載の半導体装置。 - 前記主面側から見て、前記ゲート抵抗を囲むように、前記ゲート抵抗の周縁に沿って、環状に前記半導体基板を分離する分離層をさらに備えた、
請求項1に記載の半導体装置。 - 前記分離層は、前記半導体基板に形成されたトレンチの内部に設けられたトレンチ導電層である、
請求項8に記載の半導体装置。 - 前記第1コンタクト及び第2コンタクトは、前記他方向に分離した前記一方向に延びる複数のコンタクトで構成されている、
請求項1に記載の半導体装置。 - 前記第1コンタクトは、ゲートパッドに接続し、前記第2コンタクトは、アクティブセルに接続する、
請求項1に記載の半導体装置。 - 前記半導体基板は、前記主面側から見て、アクティブセル部と、ゲート抵抗部と、を含み、
前記アクティブセル部に、IGBTが形成され、
前記ゲート抵抗部に、前記ゲート抵抗が形成された、
請求項1に記載の半導体装置。 - 半導体基板の主面にアクティブセル部及びゲート抵抗部を設定するステップと、
前記アクティブセル部に第1導電型の第1不純物を導入するとともに、前記アクティブセル部及び前記ゲート抵抗部に第2導電型の第2不純物を導入するステップと、
前記アクティブセル部の前記第1不純物を含む領域と、前記第2不純物を含む領域とを区分するようにトレンチを形成するとともに、前記ゲート抵抗部の前記第2不純物を含む領域を区分するようにトレンチを形成するステップと、
前記半導体基板を熱処理することにより、各領域の各不純物を拡散させるステップと、
前記主面及び前記トレンチの内面に絶縁膜を形成するステップと、
前記トレンチの内部に導電材料を埋め込んでトレンチ電極を形成するとともに、前記ゲート抵抗部における前記主面側に前記導電材料からゲート抵抗を形成するステップと、
を備えた半導体装置の製造方法。 - 前記アクティブセル部に所定の処理を行ってIGBTを形成するとともに、前記ゲート抵抗部に、前記ゲート抵抗の下方の前記半導体基板に形成されたキャリアを排出するキャリア排出機構を形成するステップと、
をさらに備えた請求項13に記載の半導体装置の製造方法。 - 前記主面に平行な面内における一方向に延び、前記面内における前記一方向に直交する他方向に間隔をあけて前記ゲート抵抗の上面に接続された第1コンタクト及び第2コンタクトを形成するステップをさらに備え、
前記ゲート抵抗を形成するステップにおいて、前記ゲート抵抗を、
前記一方向に延び、前記第1コンタクトが接続された第1接続部と、
前記一方向に延び、前記第2コンタクトが接続された第2接続部と、
前記他方向に延び、一端が前記第1接続部に接続し、他端が前記第2接続部に接続した複数の延在部と、
を有するようにし、さらに、
隣り合う前記延在部の間に開口部が形成され、
前記第1コンタクトまたは第2コンタクトを介して、前記ゲート抵抗がトランジスタのゲート電極に接続し、
前記キャリア排出機構が前記開口部に形成されるように、前記ゲート抵抗を形成する、
請求項14に記載の半導体装置の製造方法。
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