JP2006157016A - コンタクトホールを有する半導体装置の製造方法および半導体装置 - Google Patents
コンタクトホールを有する半導体装置の製造方法および半導体装置 Download PDFInfo
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Abstract
【解決手段】備えられた、各メサ領域(3)によって互いに隔離された複数の各トレンチ(2)と、各トレンチ(2)に第1絶縁層(6)によって半導体基板(1)から電気的に絶縁されている電極(4)とが半導体基板(1)に設けられ、上記電極の上端がトレンチの上端よりも深いレベルに位置している構造体の表面(7、8、9)に熱酸化プロセスを施す。これにより、上記構造体の表面の少なくとも一部を覆う第2絶縁層(10)を形成する。半導体基板(1)がメサ領域(3)の領域において露出するように、平坦化プロセスを実行する。この平坦化プロセス後、第2絶縁層(10)の残存部分をコンタクトホールマスクとして用いて、メサ領域(3)にコンタクトホール(12)を形成する。
【選択図】図6
Description
半導体基板に、各メサ領域によって互いに絶縁された複数のトレンチが設けられ、
上記各トレンチ内に、第1絶縁層によって上記半導体基板から電気的に絶縁されている各電極が設けられ、上記各電極の上端が、上記各トレンチの上端よりも深いレベルに位置している、構造体から得られ、本発明の方法は、
上記構造体の表面に対し熱酸化プロセスを施すことにより、上記構造体の表面の少なくとも一部を覆う第2絶縁層を形成するステップと、
上記半導体基板が各メサ領域の領域において露出するように、平坦化プロセスを実行するステップと、
上記平坦化プロセス後に残存した上記第2絶縁層の残存部分をコンタクトホールマスクとして用いて、上記各メサ領域に対し上記各コンタクトホールを形成するステップとを有している。
・SFET3プロセスとの適合性がある。
・熱酸化を行う間に層厚変動が最小になるようにスペーサー幅の規定を制限することにより、スペーサー幅のプロセス変化量を最小にできる。
・スペーサーを規定する酸化物を、ゲート絶縁部として用いることができる。
・全体仕様に対して大きく影響する、コンタクトホール面の形成に関するズレ/CD要求が回避される。
・酸化物の厚さの変動が小さいので、スペーサーを非常に正確に設定できる(15nmよりも狭い変動)。したがって、基板コンタクト領域の形成位置が閾値電圧に及ぼす影響を最小限にできる。
・ポスト酸化物によって得られる、ソース金属に対する誘電体絶縁部の質が、従来技術において用いられているプラズマプロセスによって形成される絶縁部の質よりも高い。
・ゲート酸化物は、酸化プロセスによって形成される酸化物によって補強されている。
2 トレンチ
3 メサ領域
4 ゲート電極
5 ソース電極
6 第1絶縁層
7 メサ領域の表面
8 ゲート電極の上部領域
9 トレンチ内壁の被覆されていない領域
10 第2絶縁層
11 第3絶縁層
12 コンタクトホール
13 導電性材料
14 ソース材料
15 基板領域
Claims (22)
- 半導体基板(1)に、各メサ領域(3)によって互いに絶縁された複数の各トレンチ(2)と、
上記各トレンチ(2)内に、第1絶縁層(6)によって半導体基板(1)から電気的に絶縁されている各電極(4)とが設けられ、
上記各電極(4)の上端が、上記トレンチ(2)の上端よりも深いレベルに位置する構造体の上記半導体基板(1)に各コンタクトホール(12)を形成するための半導体装置の製造方法であって、
上記構造体の表面(7、8、9)に熱酸化プロセスを施すことにより、上記構造体の表面の少なくとも一部を覆う第2絶縁層(10)を形成するステップと、
上記半導体基板(1)が各メサ領域(3)の領域において露出するように、平坦化プロセスを実行するステップと、
上記平坦化プロセス後に、残存した上記第2絶縁層(10)の残存部分をコンタクトホールマスクとして用いて、上記各メサ領域(3)に上記各コンタクトホール(12)をそれぞれ形成するステップとを有する半導体装置の製造方法。 - 上記熱酸化プロセスを実行する前に、上記各電極(4)の上部領域(8)を露出させる請求項1に記載の半導体装置の製造方法。
- 上記第2絶縁層(10)を形成した後で、上記第2絶縁層(10)の上に第3絶縁層(11)を堆積する請求項1または2に記載の半導体装置の製造方法。
- 上記平坦化プロセスを、CMPプロセスおよび/またはエッチングプロセスによって行い、
上記平坦化プロセスによって、上記第2絶縁層(10)の一部および/または上記第3絶縁層(11)の一部を除去する請求項1〜3のいずれか1項に記載の半導体装置の製造方法。 - 上記各コンタクトホール(12)を、エッチングプロセスによって形成し、
上記エッチングプロセスに用いるエッチャントは、上記第2絶縁層(10)ではなく上記半導体基板(1)のみをエッチングするような選択的エッチャントである請求項1〜4のいずれか1項に記載の半導体装置の製造方法。 - 半導体装置(特に、トレンチトランジスタ、IGBT、ショットキダイオードなど)の製造方法の中間ステップである請求項1〜5のいずれか1項に記載の半導体装置の製造方法。
- 上記各電極(4)が、半導体材料によって構成されている請求項1〜6のいずれか1項に記載の半導体装置の製造方法。
- 上記半導体基板(1)は単結晶シリコンからなり、
上記各電極(4)はポリシリコンからなる請求項7に記載の半導体装置の製造方法。 - 上記各電極がトレンチトランジスタの各ゲート電極である請求項1〜8のいずれか1項に記載の半導体装置の製造方法。
- メサ領域(3)によって互いに絶縁された複数のトレンチ(2)と、
上記トレンチ(2)毎に備えられた電極(4、5)と、を有する半導体基板(1)を備え、
上記電極は、上記電極の周囲から対応する絶縁部(6、10、11)により電気的に絶縁されており、かつ、上記電極の上端が、上記電極が位置する上記トレンチの上端よりも深いレベルに配置されている半導体装置であって、
上記トレンチ(2)毎は、上記トレンチ(2)の上部領域に拡張部分を有し、
上記拡張部分は、上記対応する絶縁部(10)によって少なくとも部分的に充填されており、
上記絶縁部(10)の側部境界線は、上記各絶縁部が、メサ領域においてコンタクトホール(12)を形成するためのコンタクトホールマスクとして用いられるように選択されている半導体装置。 - 上記拡張部分が漏斗型である請求項10に記載の半導体装置。
- 上記各電極(4)上に位置する上記各絶縁部の一部が複数の絶縁層(10、11)を含んでいる請求項10または11に記載の半導体装置。
- 上記電極毎における垂直方向の上端の位置が、上記漏斗型をした拡張部分における垂直方向の下端の位置上にある請求項11または12に記載の半導体装置。
- 上記漏斗型の拡張部分における垂直方向の下端の位置上に配置された上記各電極の領域は、拡張していない形状である請求項13に記載の半導体構造。
- 上記各電極は、上記各トレンチの下部領域において薄くなっている請求項10〜14のいずれか1項に記載の半導体装置。
- 上記電極毎は、互いに絶縁された上部電極(4)と下部電極(5)とに分かれており、上記下部電極は、上記上部電極よりも薄くなっている請求項15に記載の半導体装置。
- 上記絶縁部(6)が、上記各トレンチ(2)の下部領域において厚くなっている請求項15または16に記載の半導体装置。
- メサ領域毎に、ソース領域(14)と基板領域(15)とが形成されている垂直構造のトランジスタである請求項10〜17のいずれか1項に記載の半導体装置。
- メサ領域毎に、上記ソース領域と上記基板領域とを接続させるためのコンタクトホール(12)が形成されており、
上記コンタクトホールの横方向端部が、隣り合う各トレンチの絶縁部(10)において終端している請求項18に記載の半導体装置。 - コンタクトホール毎の内部の下部領域に、基板コンタクト領域が形成されている請求項19に記載の半導体装置。
- 上記半導体基板(1)が第1導電型であり、
上記ソース領域(14)が第1導電型であり、
上記基板領域(15)が第2導電型であり、
上記基板コンタクト領域が第2導電型である請求項20に記載の半導体装置。 - 各メサ領域により互いに隔離されている複数の各トレンチ(2)と、
上記各トレンチ(2)内に設けられた電極(4、5)と、を有する半導体基板(1)を備えた半導体装置であって、
上記電極は、上記電極の各周囲から対応する絶縁部(6、10、11)により電気的に絶縁されており、
上記トレンチ(2)毎の上部領域は、拡張部分を有し、
上記拡張部分は、上記対応する絶縁部(10)によって少なくとも部分的に充填されており、
上記絶縁部(10)の側部境界線は、上記各絶縁部が、上記各メサ領域において各コンタクトホール(12)を形成するためのコンタクトホールマスクとして用いられるように選択されており、
電極(4、5)毎の上記上端が、上記電極が位置するトレンチ(2)の上端よりも深いレベルに配置されており、
上記コンタクトホール(12)に隣り合っている絶縁部(10)の少なくとも表面領域が水平面の一部を構成し、
上記水平面における垂直方向での位置が、上記各トレンチ(2)における垂直方向でのの上端の位置に相当している、半導体装置。
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