JP6437657B2 - 横型絶縁ゲートバイポーラトランジスタ及びその製造方法 - Google Patents
横型絶縁ゲートバイポーラトランジスタ及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000758 substrate Substances 0.000 claims description 27
- 150000002500 ions Chemical class 0.000 claims description 19
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 18
- 229920005591 polysilicon Polymers 0.000 claims description 18
- 210000000746 body region Anatomy 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000005468 ion implantation Methods 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 6
- 238000001459 lithography Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 2
- -1 boron ions Chemical class 0.000 claims description 2
- 239000012212 insulator Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 238000001020 plasma etching Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000005137 deposition process Methods 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
20 埋め込み酸化層
30 ドリフト領域
41 カソード金属
42 P型ボディ領域
44 P+領域
51 酸化層
52 P型埋め込み層
53 ポリシリコン
54 N型バッファ領域
56 P+コレクタ領域
61 ゲート
Claims (12)
- 基板と、
前記基板上に形成されたアノード側領域及びカソード側領域であって、前記アノード側領域が、前記基板上にかつ前記アノード側領域内にのみ形成されたP型埋め込み層と、前記P型埋め込み層の上方に形成されたN型バッファ領域と、前記N型バッファ領域の表面上に形成されたP+コレクタ領域を含む、アノード側領域及びカソード側領域と、
前記アノード側領域と前記カソード側領域との間に配置されたドリフト領域及びゲートと、
前記N型バッファ領域及び前記P+コレクタ領域の表面から前記P型埋め込み層に延びるトレンチゲートと、
を備える横型絶縁ゲートバイポーラトランジスタであって、
前記トレンチゲートが、トレンチの内面に形成された酸化層、及び前記トレンチ内及び前記酸化層上に満たされたポリシリコンを含み、
前記P型埋め込み層は、前記ドリフト領域によって前記N型バッファ領域から切り離され、
前記P+コレクタ領域、前記N型バッファ領域、前記P型埋め込み層、前記酸化層、及び前記ポリシリコンによって、縦型P−チャンネルMOSFETが形成される、横型絶縁ゲートバイポーラトランジスタ。 - 前記横型絶縁ゲートバイポーラトランジスタは、シリコンオンインシュレータタイプの横型絶縁ゲートバイポーラトランジスタであり、前記横型絶縁ゲートバイポーラトランジスタは、前記基板と前記ドリフト領域との間に配置された埋め込み酸化層をさらに備え、前記P型埋め込み層は、前記埋め込み酸化層の上に配置される、請求項1に記載の横型絶縁ゲートバイポーラトランジスタ。
- 前記基板はP型基板であり、前記ドリフト領域はN型ドリフト領域である、請求項1に記載の横型絶縁ゲートバイポーラトランジスタ。
- 前記カソード側領域は、前記基板上に配置されたP型ボディ領域と、前記P型ボディ領域の表面上に配置されたP+領域及びN+領域とを含む、請求項1に記載の横型絶縁ゲートバイポーラトランジスタ。
- 前記カソード側領域は、カソード金属をさらに備え、前記ゲートは、ゲート酸化層及び前記ゲート酸化層上に配置されたポリシリコンゲートを備える、請求項4に記載の横型絶縁ゲートバイポーラトランジスタ。
- 前記酸化層の厚さは、800オングストロームから2000オングストロームである、請求項1に記載の横型絶縁ゲートバイポーラトランジスタ。
- 横型絶縁ゲートバイポーラトランジスタを製造する方法であって、
ドリフト領域を有する基板を準備するステップと、
高エネルギイオン打ち込みによってP型イオンを、アノード側領域となる前記ドリフト領域の一部に打ち込んで、前記アノード側領域にのみP型埋め込み層を形成するステップと、
前記P型埋め込み層の上方の領域にN型イオンを打ち込んでN型バッファ領域を形成するステップと、
サーマルドライブインを行って、打ち込まれたP型イオン及びN型イオンを拡散させるステップと、
P型イオンをドリフト領域に打ち込んで、熱的アニーリングを行ってP型ボディ領域を形成するステップと、
リソグラフィー及びエッチングを行って、前記N型バッファ領域の表面から前記P型埋め込み層に延びるトレンチを形成するステップと、
前記トレンチの内面に酸化層を形成するステップと、
前記トレンチ及び前記酸化層上をポリシリコンで満たすステップと、
イオン打ち込みを行って前記N型バッファ領域の表面上にP+コレクタ領域を形成し、前記P型ボディ領域の表面上にP+領域及びN+領域を形成するステップと、
を含み、
前記P+コレクタ領域が前記酸化層に接触し、
前記ドリフト領域を有する基板を準備するステップで、前記ドリフト領域と前記基板との間に埋め込み酸化層が形成され、
前記高エネルギイオン打ち込みによってP型イオンを前記ドリフト領域に打ち込むステップで、前記P型埋め込み層が前記埋め込み酸化層上に形成され、
前記P型埋め込み層は、前記ドリフト領域によって前記N型バッファ領域から切り離されており、
前記P+コレクタ領域、前記N型バッファ領域、前記P型埋め込み層、前記酸化層、及び前記ポリシリコンによって、縦型P−チャンネルMOSFETが形成される、方法。 - 前記リソグラフィー及びエッチングを行って、前記N型バッファ領域の表面から前記P型埋め込み層に延びる前記トレンチを形成するステップで、前記エッチングは、反応性イオンエッチングプロセスを用いて行われる、請求項7に記載の方法。
- 前記トレンチの内面に酸化層を形成するステップで、前記酸化層は、熱酸化によって形成され、前記トレンチ及び前記酸化層上をポリシリコンで満たすステップで、蒸着プロセスによってポリシリコンゲートが形成される、請求項7に記載の方法。
- 前記高エネルギイオン打ち込みによってP型イオンを前記ドリフト領域に打ち込むステップで、前記打ち込まれたイオンはホウ素イオンである、請求項7に記載の方法。
- 前記基板はP型基板であり、前記ドリフト領域はN型ドリフト領域である、請求項7に記載の方法。
- 前記P+コレクタ領域は、前記トレンチ内で前記酸化層に接触し、前記P+コレクタ領域は、P−チャンネルMOSFETのドレインとして機能する、請求項7に記載の方法。
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