JP2021145024A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 317
- 239000012535 impurity Substances 0.000 claims abstract description 54
- 150000001875 compounds Chemical group 0.000 claims description 19
- 229910021332 silicide Inorganic materials 0.000 claims description 5
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 5
- 230000003071 parasitic effect Effects 0.000 description 14
- 230000006798 recombination Effects 0.000 description 11
- 238000005215 recombination Methods 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910005881 NiSi 2 Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
Description
図面は模式的または概念的なものであり、各部分の厚さと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
本願明細書と各図において、既出の図に関して前述したものと同様の要素には同一の符号を付して詳細な説明は適宜省略する。
図1は、第1実施形態に係る半導体装置を例示する模式的断面図である。
図1に示すように、実施形態に係る半導体装置110は、第1素子領域E1を含む。半導体装置110は、後述する第2素子領域を含んでもよい。第2素子領域は、例えばセル領域である。後述するように、第1素子領域E1の少なくとも一部は、第2素子領域の外側に設けられる。第1素子領域E1は、例えば、終端領域である。
図2(a)は、平面図である。図2(b)は、図2(a)のA1−A1線断面図である。
図3に示すように、第2導電層32から電子Ecが第1半導体領域11に向かって流れる。実施形態においては、第3半導体領域13が設けられているため、電子Ecは、第3部分領域11cから第3半導体領域13に向かって流れる。電子Ecの流れ(電子電流)が、X軸方向に沿って(X−Y平面に沿って)広がる。電子EcがX軸方向に沿って流れる領域においては、寄生pnダイオードD2はオンし難い。このため、電子EcがX軸方向に沿って流れる領域には、第1導電層31からのホールHcが入り難い。ホールHcは、第2導電層32から見て、X軸方向に遠い領域に流れる。
図4に示すように、実施形態に係る半導体装置110において、第4半導体領域14は、第1端e1及び第2端e2を含む。第1端e1から第2端e2への方向は、第1方向(X軸方向)に沿う。第1端e1の第1方向(X軸方向)における位置は、第3部分領域11cの第1方向(X軸方向)における位置と、第2端e2の第1方向(X軸方向)における位置と、の間にある。例えば、第1端e1の第1方向(X軸方向)における位置は、第3部分領域11cと第2半導体領域12との間の境界bf1の第1方向(X軸方向)における位置と、第2端e2の第1方向(X軸方向)における位置と、の間にある。
図5の横軸は、ドレイン電圧Vdである。図5の縦軸は、ドレイン電流Idである。図5には、実施形態に係る半導体装置110の特性の測定結果に加えて、第1参考例の半導体装置119の特性の測定結果が例示されている。半導体装置119においては、ショットキーダイオードが設けられていない。これを除く半導体装置119の構成は、半導体装置110の構成と同様である。
図6の横軸は、ドレイン電圧Vdである。図6の縦軸は、パラメータPIdである。パラメータPIdは、ドレイン電流Idのドレイン電圧Vdの変化に対する2階微分に対応する。
図7は、半導体装置110の半導体領域における不純物の濃度のプロファイルを例示している。図7は、図1のX1−X2線分におけるプロファイルに対応する。図7の横軸は、Z軸方向における位置pZである。縦軸は、第1導電形の不純物の濃度C1、及び、第2導電形の不純物の濃度C2である。図7に示すように、第3半導体領域13は、第1導電形の不純物と、第2導電形の不純物と、を含む。第2導電形の不純物の濃度C2は、第3半導体領域13の位置に「裾野」を有する。
これらの図には、以下の第1〜第6条件CC1〜CC6の半導体装置の特性に関するシミュレーション結果が示されている。第1条件CC1においては、終端領域にショットキーバリアダイオードが設けられていない。第2〜第6条件CC2〜CC6においては、終端領域にショットキーバリアダイオードが設けられている。第2条件CC2においては、図1に例示した構成において、第3半導体領域13が設けられていない。
Claims (20)
- 第1部分領域、第2部分領域及び第3部分領域を含む第1導電形の第1半導体領域と、
第1導電層であって、前記第1部分領域から前記第1導電層への第2方向は、前記第2部分領域から前記第1部分領域への第1方向と交差する、前記第1導電層と、
第2導電層であって、前記第2方向において、前記第3部分領域は、前記第2部分領域と前記第2導電層との間にあり、前記第2導電層は、前記第3部分領域とショットキー接触する、前記第2導電層と、
前記第1半導体部分を含む第2導電形の第2半導体領域であって、前記第1半導体部分は、前記第2方向において前記第1部分領域と前記第1導電層との間にある、前記第2半導体領域と、
前記第1導電形の第3半導体領域であって、前記第3半導体領域の少なくとも一部は、前記第2方向において前記第1部分領域と前記第1半導体部分との間にあり、前記第3半導体領域における前記第1導電形の不純物の濃度は、前記第1部分領域における前記第1導電形の前記不純物の濃度よりも高い、前記第3半導体領域と、
を含む第1素子領域を備えた、半導体装置。 - 前記第3半導体領域における前記第1導電形の前記不純物の前記濃度は、前記第3部分領域における前記第1導電形の前記不純物の濃度よりも高い、請求項1記載の半導体装置。
- トランジスタ及びダイオードの少なくともいずれかを含む第2素子領域をさらに備え、
前記第1素子領域の少なくとも一部は、前記第2素子領域の外側に設けられた、請求項1または2に記載の半導体装置。 - 前記第1素子領域は、前記第2導電形の第4半導体領域をさらに含み、
前記第4半導体領域は、前記第2方向において、前記第1半導体部分と前記第1導電層との間に設けられ、
前記第4半導体領域における前記第2導電形の不純物の濃度は、前記第1半導体部分における前記第2導電形の前記不純物の濃度よりも高い、請求項1〜3のいずれか1つに記載の半導体装置。 - 前記第1導電層は、前記第4半導体領域とオーミック接触する、請求項4記載の半導体装置。
- 前記第1素子領域は、第1化合物領域をさらに含み、
前記第1化合物領域は、前記第4半導体領域と前記第1導電層との間に設けられ、
前記第1導電層は、前記第1化合物領域を介して、前記第4半導体領域と電気的に接続された、請求項4または5に記載の半導体装置。 - 前記第1化合物領域は、シリサイドを含む、請求項6記載の半導体装置。
- 前記第1半導体領域は、第4部分領域をさらに含み、
前記第1方向において前記第1部分領域は前記第2部分領域と前記第4部分領域との間にあり、
前記第4部分領域から前記第3半導体領域の一部への方向は、前記第2方向に沿う、請求項1〜7のいずれか1つに記載の半導体装置。 - 前記第4半導体領域は、第1端及び第2端を含み、
前記第1端から前記第2端への方向は、前記第1方向に沿い、
前記第1端の前記第1方向における位置は、前記第3部分領域の前記第1方向における位置と、前記第2端の前記第1方向における位置と、の間にあり、
前記第3半導体領域は、第3端及び第4端を含み、
前記第3端から前記第4端への方向は、前記第1方向に沿い、
前記第1端の前記第1方向における前記位置は、前記第3端の前記第1方向における位置と、前記第4端の前記第1方向における位置と、の間にあり、
前記第2端の前記第1方向における前記位置は、前記第1端の前記第1方向における前記位置と、前記第4端の前記第1方向における前記位置と、の間にある、請求項1〜8のいずれか1つに記載の半導体装置。 - 前記第2端の前記第1方向における前記位置と、前記第4端の前記第1方向における前記位置と、の間の前記第1方向における第2距離は、前記第3部分領域と前記第2半導体領域との間の境界の前記第1方向における位置と、前記第2端の前記第1方向における前記位置と、の間の前記第1方向における第1距離よりも長い、請求項9記載の半導体装置。
- 前記境界の前記第1方向における前記位置は、前記第3端の前記第1方向における前記位置と、前記第1端の前記第1方向における前記位置と、の間にある、請求項9または10に記載の半導体装置。
- 前記第1導電層と前記第2導電層との間の前記第1方向に沿う長さは、0.5μm以上2μm以下である、請求項1〜11のいずれか1つに記載の半導体装置。
- 前記第2部分領域と前記第3部分領域との間の境界の前記第2方向における位置は、前記第1部分領域と前記第3半導体領域との間の境界の前記第2方向における位置と、前記第3半導体領域と前記第2半導体領域との間の境界の前記第2方向における位置と、の間にある、請求項1〜12のいずれか1つに記載の半導体装置。
- 前記第2半導体領域は、第2半導体部分をさらに含み、
前記第2半導体部分は、前記第1方向において、前記第3部分領域と前記第4半導体領域との間にあり、
前記第1半導体領域は、第5部分領域をさらに含み、
前記第3半導体領域の一部は、前記第2方向において、前記第5部分領域と前記第2半導体部分との間にある、請求項1〜13のいずれか1つに記載の半導体装置。 - 前記第1素子領域は、
第3導電層と、
前記第2導電形の第5半導体領域と、
前記第1導電形の第6半導体領域と、
をさらに含み、
前記第1半導体領域は、第6部分領域をさらに含み、
前記第5半導体領域は、第3半導体部分を含み、
前記第2部分領域は、前記第1方向において前記第6部分領域と前記第1部分領域との間にあり、
前記第6半導体領域の少なくとも一部は、前記第2方向において前記第6部分領域と前記第3半導体部分と、の間にあり、
前記第6半導体領域は、前記第3部分領域に繋がり、前記第6半導体領域における前記第1導電形の不純物の濃度は、前記第3部分領域における前記第1導電形の前記不純物の前記濃度よりも高い、請求項1〜14のいずれか1つに記載の半導体装置。
- 前記第1素子領域は、前記第2導電形の第7半導体領域をさらに含み、
前記第7半導体領域は、前記第2方向において、前記第3半導体部分と前記第3導電層との間に設けられ、
前記第7半導体領域における前記第2導電形の不純物の濃度は、前記第3半導体部分における前記第2導電形の前記不純物の濃度よりも高い、請求項15記載の半導体装置。 - 前記第1素子領域は、シリサイドを含む第2化合物領域をさらに含み、
前記第2化合物領域は、前記第7半導体領域と前記第3導電層との間に設けられ、
前記第3導電層は、前記第2化合物領域を介して、前記第7半導体領域と電気的に接続された、請求項16記載の半導体装置。 - 前記第3半導体領域と前記第6半導体領域との間の前記第1方向に沿う距離は、前記第2導電層の前記第1方向に沿う長さよりも短い、請求項15〜17のいずれか1つに記載の半導体装置。
- 第1電極と、
第2電極と、
をさらに備え、
前記第1電極から前記第2電極への方向は、前記第2方向に沿い、
前記第1電極と前記第2電極との間に前記第1半導体領域の少なくとも一部があり、
前記第1半導体領域と前記第2電極との間に、前記第1導電層及び前記第2導電層があり、
前記第1導電層及び前記第2導電層は、前記第2電極と電気的に接続された、請求項1〜18のいずれか1つに記載の半導体装置。 - 前記第1半導体領域、前記第2半導体領域及び前記第3半導体領域は、SiCを含む、請求項1〜19のいずれか1つに記載の半導体装置。
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