JP7017021B2 - 炭化珪素半導体基体、炭化珪素半導体基体の結晶軸合わせ方法および炭化珪素半導体装置の製造方法 - Google Patents
炭化珪素半導体基体、炭化珪素半導体基体の結晶軸合わせ方法および炭化珪素半導体装置の製造方法 Download PDFInfo
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Description
図1は、実施の形態にかかる炭化珪素半導体基体の構造を示す断面図および上面図である。図1(a)は、炭化珪素半導体基体の構造を示す断面図である。炭化珪素半導体基体は、4H-SiCからなる炭化珪素からなるn+型半導体基板(以下、n+型炭化珪素基板とする)1上に炭化珪素半導体層をエピタキシャル成長させてなる半導体ウェハ、または当該半導体ウェハを個片化した半導体チップである。具体的には、図1(a)に示すように、炭化珪素半導体基体は、n+型炭化珪素基板1上にn型ドリフト層2およびp型ベース層3となる各炭化珪素層を順にエピタキシャル成長させてなる。
2 n型ドリフト層
3 p型ベース層
4 SiO2膜
5 フォトレジスト
7 n++型ソース領域
8 p++型コンタクト領域
9 ゲート絶縁膜
10 ゲート電極
11 層間絶縁膜
12 ソース電極
13 ドレイン電極
18 トレンチ
21 積層欠陥
22 第1オリエンテーションフラット
23 結晶軸方向<11-20>を示す辺
24 結晶軸方向<11-20>を示す直線
25 結晶軸方向<11-20>を示す目印
26 第2オリエンテーションフラット
Claims (9)
- 炭化珪素基板のおもて面に設けられた、第1導電型または第2導電型の炭化珪素からなるエピタキシャル成長層を備え、
前記エピタキシャル成長層上に、前記炭化珪素基板の結晶軸方向を誤差1°以内の範囲で示す目印が設けられ、該目印は、1つの帯状積層欠陥または1つの三角形状の積層欠陥の1辺の延長線上に設けられることを特徴とする炭化珪素半導体基体。 - 前記目印は、前記炭化珪素基板の結晶軸方向を誤差0.5°以内の範囲で示すことを特徴とする請求項1に記載の炭化珪素半導体基体。
- 前記目印は、前記炭化珪素基板の端部に設けられていることを特徴とする請求項1または2に記載の炭化珪素半導体基体。
- 前記炭化珪素基板のポリタイプが、4H-SiC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炭化珪素半導体基体。
- 結晶軸方向を示す第1オリエンテーションフラットが設けられた炭化珪素基板のおもて面に第1導電型または第2導電型の炭化珪素からなるエピタキシャル成長層を形成する第1工程と、
前記エピタキシャル成長層から積層欠陥を検出する第2工程と、
検出した前記積層欠陥と前記第1オリエンテーションフラットとから前記炭化珪素基板の結晶軸方向を確認する第3工程と、
確認した前記結晶軸方向を示す目印を作成する第4工程と、
を含むことを特徴とする炭化珪素半導体基体の結晶軸合わせ方法。 - 前記第2工程は、前記積層欠陥が検出されない場合、前記エピタキシャル成長層に傷をつけ、紫外線を照射することで、前記積層欠陥を出現させることを特徴とする請求項5に記載の炭化珪素半導体基体の結晶軸合わせ方法。
- 前記傷をつける場所は、前記第1オリエンテーションフラットと垂直な位置に設けられた第2オリエンテーションフラットから所定の距離内にあることを特徴とする請求項6に記載の炭化珪素半導体基体の結晶軸合わせ方法。
- 前記第3工程は、前記積層欠陥の1辺を基準にして前記炭化珪素基板の結晶軸方向を確認することを特徴とする請求項5~7のいずれか一つに記載の炭化珪素半導体基体の結晶軸合わせ方法。
- 結晶軸方向を示す第1オリエンテーションフラットが設けられた炭化珪素基板のおもて面に第1導電型の炭化珪素からなる第1エピタキシャル成長層を形成する第1工程と、
前記第1エピタキシャル成長層の、前記炭化珪素基板側に対して反対側に第2導電型の炭化珪素からなる第2エピタキシャル成長層を形成する第2工程と、
前記第2エピタキシャル成長層から積層欠陥を検出する第3工程と、
検出した前記積層欠陥と前記第1オリエンテーションフラットとから前記炭化珪素基板の結晶軸方向を確認する第4工程と、
確認した前記結晶軸方向を示す目印を作成する第5工程と、
前記第2エピタキシャル成長層の内部に、前記第1エピタキシャル成長層よりも不純物濃度の高い第1導電型の第1半導体領域を選択的に形成する第6工程と、
前記第1半導体領域および前記第2エピタキシャル成長層を貫通して前記第1エピタキシャル成長層に達するトレンチを形成する第7工程と、
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を形成する第8工程と、
前記第1半導体領域および前記第2エピタキシャル成長層に接する第1電極を形成する第9工程と、
前記炭化珪素基板の裏面に第2電極を形成する第10工程と、
を備え、
前記第7工程は、前記トレンチの側壁を、前記結晶軸方向を示す目印に基づき前記結晶軸方向と平行に形成することを特徴とする炭化珪素半導体装置の製造方法。
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