JP6561759B2 - 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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- JP6561759B2 JP6561759B2 JP2015205336A JP2015205336A JP6561759B2 JP 6561759 B2 JP6561759 B2 JP 6561759B2 JP 2015205336 A JP2015205336 A JP 2015205336A JP 2015205336 A JP2015205336 A JP 2015205336A JP 6561759 B2 JP6561759 B2 JP 6561759B2
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Description
本発明にかかる半導体装置は、ワイドバンドギャップ半導体を用いて構成される。実施の形態1においては、ワイドバンドギャップ半導体として例えば炭化珪素(SiC)を用いて作製された炭化珪素半導体装置について、MOSFETを例に説明する。図1は、実施の形態1にかかる炭化珪素半導体装置の構成を示す断面図である。図1には、活性領域の状態を図示する。
次に、実施の形態にかかる炭化珪素半導体装置の製造方法について、例えば、1200Vの耐圧クラスのMOSFETを作成する場合を例に説明する。まず、例えば2×1019cm-3程度の不純物濃度で窒素がドーピングされたn+型炭化珪素基板1を用意する。n+型炭化珪素基板1は、主面が例えば、<11−20>方向に4度程度のオフ角を有する(000−1)面であってもよい。
図2は、実施の形態2にかかる炭化珪素半導体装置の構成を示す断面図である。実施の形態2にかかる半導体装置が実施の形態1にかかる半導体装置と異なるのは、応力緩和領域100に、p++型コンタクト領域5とソース電極8との間に、絶縁膜13と層間絶縁膜14とが絶縁膜13、層間絶縁膜14の順で設けられていることである。
次に、実施の形態2にかかる半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n型炭化珪素エピタキシャル層2を形成する工程から、層間絶縁膜14を成膜する工程までを順に行う。ここで、炭化珪素半導体基体のおもて面側を熱酸化し形成されたゲート絶縁膜6のうち、応力緩和領域100に存在する膜が絶縁膜13となる。
図3は、実施の形態3にかかる炭化珪素半導体装置の構成を示す断面図である。実施の形態3にかかる半導体装置が実施の形態2にかかる半導体装置と異なるのは、層間絶縁膜14を覆う窒化膜20(Si3N4)が設けられていることである。
次に、実施の形態3にかかる半導体装置の製造方法について説明する。まず、実施の形態2と同様に、n型炭化珪素エピタキシャル層2を形成する工程から、層間絶縁膜14の平担化を行うために熱処理(リフロー)を行う工程までを順に行う。
図4は、実施の形態4にかかる炭化珪素半導体装置の構成を示す断面図である。実施の形態4にかかる半導体装置が実施の形態2にかかる半導体装置と異なるのは、ソース電極8を覆う窒化膜20が選択的に設けられていることである。
次に、実施の形態4にかかる半導体装置の製造方法について説明する。まず、実施の形態2と同様に、n型炭化珪素エピタキシャル層2を形成する工程から、ソース電極8を成膜する工程までを順に行う。
2 n型炭化珪素エピタキシャル層
4 n+型ソース領域
5 p++型コンタクト領域
6 ゲート絶縁膜
7 ゲート電極
8 ソース電極
9 ドレイン電極
10 p+型領域
11 p型炭化珪素エピタキシャル層
12 n型ウェル領域
13 絶縁膜
14 層間絶縁膜
15 保護膜
16 めっき膜
17 第2の保護膜
18 ピン状電極
19 半田
20 窒化膜
21 段差
100 応力緩和領域
w めっき膜の幅
Claims (5)
- シリコンよりもバンドギャップが広い半導体からなる第1導電型のワイドバンドギャップ半導体基板と、
前記ワイドバンドギャップ半導体基板のおもて面に堆積された、前記ワイドバンドギャップ半導体基板よりも不純物濃度の低い第1導電型のワイドバンドギャップ半導体堆積層と、
前記ワイドバンドギャップ半導体堆積層の、前記ワイドバンドギャップ半導体基板側に対して反対側の表面層に選択的に設けられた第2導電型半導体領域と、
前記ワイドバンドギャップ半導体堆積層および前記第2導電型半導体領域の表面に設けられた、シリコンよりもバンドギャップが広い半導体からなる第2導電型のワイドバンドギャップ半導体層と、
前記ワイドバンドギャップ半導体層内の前記ワイドバンドギャップ半導体堆積層上に選択的に設けられた第1の第1導電型領域と、
前記ワイドバンドギャップ半導体層内に選択的に設けられた第2の第1導電型領域と、
前記ワイドバンドギャップ半導体層の、前記第2の第1導電型領域と前記第1の第1導電型領域とに挟まれた部分の表面上にゲート絶縁膜を介して設けられたゲート電極と、
前記ワイドバンドギャップ半導体層および前記第2の第1導電型領域に接するソース電極と、
前記ゲート電極を覆う層間絶縁膜と、
前記ワイドバンドギャップ半導体基板の裏面に設けられたドレイン電極と、
前記ソース電極上に、選択的に設けられためっき膜と、
前記めっき膜に半田を介して接続された、外部信号をとり出すピン状電極と、
を備え、
前記めっき膜の前記ワイドバンドギャップ半導体基板と平行な方向の幅は、10μm以上であり、
前記めっき膜と対向する前記ワイドバンドギャップ半導体層内に、前記第2の第1導電型領域および前記第1の第1導電型領域が設けられていない、
ことを特徴とする半導体装置。 - 前記ソース電極の段状の部分の前記ワイドバンドギャップ半導体基板のおもて面からの高さの差は、2μm以下であることを特徴とする請求項1に記載の半導体装置。
- 前記層間絶縁膜は、窒化膜により覆われてい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。
- 前記ソース電極は、窒化膜により選択的に覆われてい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。
- シリコンよりもバンドギャップが広い半導体からなる第1導電型のワイドバンドギャップ半導体基板のおもて面に、前記ワイドバンドギャップ半導体基板よりも不純物濃度の低い第1導電型のワイドバンドギャップ半導体堆積層を形成する工程と、
前記ワイドバンドギャップ半導体堆積層の表面層に、第2導電型半導体領域を選択的に形成する工程と、
前記ワイドバンドギャップ半導体堆積層の表面に、シリコンよりもバンドギャップが広い半導体からなる、第2導電型のワイドバンドギャップ半導体層を形成する工程と、
前記ワイドバンドギャップ半導体層の内部、前記ワイドバンドギャップ半導体堆積層上に第1の第1導電型領域を選択的に形成する工程と、
前記ワイドバンドギャップ半導体層の内部に第2の第1導電型領域を選択的に形成する工程と、
前記ワイドバンドギャップ半導体層の、前記第2の第1導電型領域と前記第1の第1導電型領域とに挟まれた部分の表面上にゲート絶縁膜を介してゲート電極を形成する工程と、
前記ワイドバンドギャップ半導体層および前記第2の第1導電型領域に接するソース電極を形成する工程と、
前記ゲート電極を覆う層間絶縁膜を形成する工程と、
前記ワイドバンドギャップ半導体基板の裏面にドレイン電極を形成する工程と、
前記ソース電極上に、選択的にめっき膜を形成する工程と、
前記めっき膜に半田を介して接続された、外部信号をとり出すピン状電極を形成する工程と、
を含み、
前記めっき膜を形成する工程は、前記めっき膜の前記ワイドバンドギャップ半導体基板と平行な方向の幅を10μm以上で形成し、
前記第1の第1導電型領域を選択的に形成する工程は、前記めっき膜と対向する前記ワイドバンドギャップ半導体層内に、前記第1の第1導電型領域を形成せず、
前記第2の第1導電型領域を選択的に形成する工程は、前記めっき膜と対向する前記ワイドバンドギャップ半導体層内に、前記第2の第1導電型領域を形成しない、
ことを特徴とする半導体装置の製造方法。
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