JP7299769B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7299769B2 JP7299769B2 JP2019116552A JP2019116552A JP7299769B2 JP 7299769 B2 JP7299769 B2 JP 7299769B2 JP 2019116552 A JP2019116552 A JP 2019116552A JP 2019116552 A JP2019116552 A JP 2019116552A JP 7299769 B2 JP7299769 B2 JP 7299769B2
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Description
しかし、特許文献1の領域分離構造では、第1の部分のn型エピタキシャル層から、p型半導体基板内でp型分離層を潜って、第2の部分のn型エピタキシャル層に至る漏れ電流経路が存在する。すなわち、寄生のnpnトランジスタが形成されているため、第1の部分、第2の部分およびp型半導体基板の間の電位の関係によっては、充分な領域分離性能が得られず、それに応じてデバイス特性が悪化するおそれがある。具体的には、誤動作が生じたり、ノイズが生じたりするおそれがある。
図1は、この発明の一実施形態に係る半導体装置100の模式的な平面図であり、半導体基板5上の領域分離構造8の配置を示す。半導体装置100は、半導体基板5上で区画された第1デバイス領域R1と、第2デバイス領域R2とを有している。第1デバイス領域R1と第2デバイス領域R2とは、領域分離構造8によって区画されている。より詳細には、領域分離構造8は、第1デバイス領域R1および第2デバイス領域R2を取り囲む環状部分8Aと、環状部分8Aの内部を第1デバイス領域R1と第2デバイス領域R2とに区切る境界部分8Bとを含む。この実施形態では、第1デバイス領域R1および第2デバイス領域R2は、それぞれ矩形状の領域である。それに応じて、領域分離構造8は、第1デバイス領域R1を矩形状に取り囲んでおり、かつ第2デバイス領域R2を矩形状に取り囲んでいる。
第3半導体層3は、第1半導体層1よりもp型不純物濃度の低い半導体層である。この実施形態では、第3半導体層3は、第1半導体層1の表面から結晶成長させたp-型のエピタキシャル層である。第3半導体層3の層厚は、たとえば、6μm~13μmである。第3半導体層3の層厚は、6μm以上7μm未満、7μm以上8μm未満、8μm以上9μm未満、9μm以上10μm未満、10μm以上11μm未満、11μm以上12μm未満、12μm以上13μm以下のうちの一つ以上を含む範囲であってもよい。第3半導体層3のp型不純物濃度(第1導電型不純物濃度)は、たとえば、1E+15cm-3~1E+16cm-3である。このp型不純物濃度は、1E+15cm-3以上2E+15cm-3未満、2E+15cm-3以上4E+15cm-3未満、4E+15cm-3以上6E+15cm-3未満、6E+15cm-3以上8E+15cm-3未満、8E+15cm-3以上1E+16cm-3以下のうちの一つ以上を含む範囲であってもよい。
領域分離構造8(図1の境界部分8B)は、第1デバイス領域R1と第2デバイス領域R2との間に配置されており、これらのデバイス領域R1,R2を電気的に分離している。
第1デバイス領域R1には、nチャンネル型MIS(Metal-Insulator-Semiconductor)トランジスタ10n(以下、「nMISトランジスタ10n」という。)と、pチャンネル型MISトランジスタ10p(以下、「pMISトランジスタ10p」という。)とが形成されている。すなわち、第1デバイス領域R1には、CMIS(Complementary Metal Insulator Semiconductor)構造が形成されている。nMISトランジスタ10nおよびpMISトランジスタ10pは、この実施形態では、いずれもプレーナ型のMIS型FET(電界効果型トランジスタ)である。nMISトランジスタ10nおよびpMISトランジスタ10pは、たとえば耐圧1V以上10V以下(より具体的な例では1V以上5V以下、または3V以上10V未満)の低耐圧型である。
第2デバイス領域R2には、この実施形態では、nチャンネル型MISトランジスタ20が形成されている。nチャンネル型MISトランジスタ20は、たとえば耐圧10V以上100V以下(より具体的な例では10V超。たとえば、10V超30V以下、15V以上30V以下、30V以上100V以下など。)の高耐圧型である。
図3は、図2の断面構造において、領域分離構造8の部分を拡大して示す部分拡大断面図である。ただし、図面の簡素化のために、n型ウェル15、ソース領域16s、n型ウェル21コンタクト領域22の図示は省略している。
絶縁膜58は、ディープトレンチ56の内壁に形成されている。絶縁膜58は、酸化シリコン膜であってもよい。絶縁膜58は、酸化シリコン膜に代えてまたはこれに加えて、窒化シリコン膜を含んでいてもよい。絶縁膜58は、たとえば、0.1μm~1.0μmの厚さを有していてもよい。この実施形態では、絶縁膜58は、ディープトレンチ56の内壁のうち、側壁に形成されており、底壁には形成されていない。換言すれば、絶縁膜58は、ディープトレンチ56の底壁を露出させる開口58aを有している。絶縁膜58は、ディープトレンチ56の側壁に倣って形成されており、その内方にトレンチ状の空間を区画している。この空間に埋込み電極59が埋め込まれている。
次に、図4Bに示すように、p型の不純物を添加しながら半導体基板5の表面からエピタキシャル成長(たとえばシリコンの結晶成長)が行われる。それにより、イオン注入されたp型不純物が半導体基板5とエピタキシャル層との境界部に拡散する。その結果、半導体基板5上にp+型の第1半導体層1が形成され、さらに第1半導体層1上にp-型の第3半導体層3が形成される。
この実施形態では、埋設物は、ディープトレンチ56の内壁に形成された絶縁膜58と、絶縁膜58を挟んでディープトレンチ56に埋め込まれた埋込み電極59とを含む。これにより、領域分離構造8の近傍の電界を適切に制御して、領域分離性能を高めることができる。
この比較例の構造を採用する場合の一つの不利益は、p+型の半導体基板95の製造コストである。すなわち、p+型の半導体基板95は、p-型の半導体基板に比較して製造コストが高い。
この実施形態の領域分離構造8は、第1の実施形態の製造工程において、ディープトレンチ56の底部の絶縁膜58に開口58aを形成するエッチング工程を省くことによって製造できる。
図7は、この発明の第4の実施形態に係る半導体装置100の構成を説明するための図であり、領域分離構造8を示す拡大図である。この実施形態の領域分離構造8は、第2半導体層2の表面から第1半導体層1に至る領域に渡って形成されたp型のコラム領域70を含む。コラム領域70は、断面においてコラム状に形成されており、かつ平面視においては、領域分離構造8の平面形状(図1参照)に従って第2半導体層2の表面に沿って帯状に延びている。
以上、この発明の実施形態について説明してきたが、この発明は、さらに他の形態で実施することもできる。たとえば、前述の実施形態では、第1導電型がp型、第2導電型がn型の例について説明したが、第1導電型がn型、第2導電型がp型であってもよい。この場合の具体的な構成は、前述の説明および添付図面において、p型領域をn型領域に置き換え、n型領域をp型領域に置き換えることによって得られる。その他、特許請求の範囲に記載された事項の範囲で種々の設計変更を施すことが可能である。
R1 第1デバイス領域
R2 第2デバイス領域
1 第1半導体層
2 第2半導体層
3 第3半導体層
4,41),42 埋込み層
5 半導体基板
8 領域分離構造
10n nMISトランジスタ
10p pMISトランジスタ
20 MISトランジスタ
30 層間絶縁膜
32 金属プラグ
37 電極
50 トレンチ分離構造
51 STI構造
52 シャロウトレンチ
53 埋設物
55 DTI構造
56 ディープトレンチ
57 埋設物
58 絶縁膜
58a 絶縁膜の開口
59 埋込み電極
60 絶縁物
70 コラム領域
71 埋込み層
72 ウェル
Claims (9)
- 第1導電型の半導体基板と、
前記半導体基板の上に形成され、前記半導体基板の第1導電型不純物濃度よりも高い第1導電型不純物濃度を有する第1導電型の第1半導体層と、
前記第1半導体層の上に形成された第2導電型の第2半導体層と、
前記第2半導体層に形成され、第1基準電圧を基準に動作する第1デバイス領域と、
前記第1デバイス領域から間隔を空けて前記第2半導体層に形成され、前記第1基準電圧とは異なる第2基準電圧を基準に動作する第2デバイス領域と、
前記第1デバイス領域および前記第2デバイス領域の間に介在し、前記第2半導体層の表面から前記第1半導体層に至る領域に形成され、前記第1デバイス領域および前記第2デバイス領域を電気的に分離する領域分離構造と、を含み、
前記領域分離構造は、前記第2半導体層の表面から前記第1半導体層に達する深さのトレンチ分離構造を含む、半導体装置。 - 前記トレンチ分離構造は、前記第2半導体層の表面から前記第1半導体層に達する深さのトレンチと、前記トレンチに埋設された埋設物とを含む、請求項1に記載の半導体装置。
- 前記埋設物は、前記トレンチの内壁に形成された絶縁膜と、前記絶縁膜を挟んで前記トレンチに埋め込まれた埋込み電極と、を含む、請求項2に記載の半導体装置。
- 前記埋込み電極と前記第1半導体層とが同電位となるように電気的に接続されている、請求項3に記載の半導体装置。
- 前記絶縁膜は、前記トレンチの底壁を露出させる開口を有し、前記埋込み電極は前記開口を介して前記第1半導体層に接している、請求項3または4に記載の半導体装置。
- 前記絶縁膜は、前記トレンチの内壁の全面を覆っている、請求項3または4に記載の半導体装置。
- 前記埋設物は、絶縁物からなる、請求項2に記載の半導体装置。
- 前記トレンチは、前記第2半導体層の表面から前記第2半導体層内の所定の深さに至り、前記第2半導体層内に底部を有する第1トレンチと、前記第1トレンチよりも幅狭に形成され、前記第1トレンチの底部から前記第2半導体層を貫通して前記第1半導体層に達する第2トレンチとを含む、請求項2~7のいずれか一項に記載の半導体装置。
- 前記第1半導体層と前記第2半導体層との間に形成され、前記第1半導体層の第1導電型不純物濃度よりも低い第1導電型不純物濃度を有する、第1導電型の第3半導体層をさらに含む、請求項1~8のいずれか一項に記載の半導体装置。
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