JP2018517279A - 横方向拡散金属酸化物半導体電界効果トランジスタ及びその製造方法 - Google Patents
横方向拡散金属酸化物半導体電界効果トランジスタ及びその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 34
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 33
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 33
- 230000005669 field effect Effects 0.000 title claims abstract description 32
- 238000009792 diffusion process Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 210000000746 body region Anatomy 0.000 claims abstract description 17
- 238000003780 insertion Methods 0.000 claims description 26
- 230000037431 insertion Effects 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 23
- 150000002500 ions Chemical class 0.000 claims description 20
- 238000000206 photolithography Methods 0.000 claims description 10
- 229920002120 photoresistant polymer Polymers 0.000 claims description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 8
- 229920005591 polysilicon Polymers 0.000 claims description 8
- 238000002513 implantation Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 description 9
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 230000005684 electric field Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
【選択図】図1
Description
Claims (14)
- 基板、ソース、ドレイン、ボディー領域及び基板上のウェル領域を有する横方向拡散金属酸化物半導体電界効果トランジスタであって、
前記ウェル領域は、
ドープ型がP型であり、前記ドレインの下方に設けられるとともに前記ドレインに接する介挿式ウェルと、
前記介挿式ウェルの両側に設けられるNウェルと、
前記Nウェルの隣に設けられるとともに前記Nウェルに接し、前記ソース及び前記ボディー領域が内設されるPウェルと、
を有することを特徴とする横方向拡散金属酸化物半導体電界効果トランジスタ。 - 前記ウェル領域は、前記基板上の第1ウェル領域及び第1ウェル領域上の第2ウェル領域を有し、
前記介挿式ウェルは、前記第1ウェル領域内の第1介挿式ウェル及び前記第2ウェル領域内の第2介挿式ウェルを有し、
前記Nウェルは、前記第1ウェル領域内の第1Nウェル及び前記第2ウェル領域内の第2Nウェルを有し、
前記Pウェルは、前記第1ウェル領域内の第1Pウェル及び前記第2ウェル領域内の第2Pウェルを有する
ことを特徴とする請求項1に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。 - 前記第1Nウェルのドープ濃度は、前記第2Nウェルのドープ濃度より低く、
前記第1Pウェルのドープ濃度は、前記第2Pウェルのドープ濃度より低く、
前記第1介挿式ウェルのドープ濃度は、前記第2介挿式ウェルのドープ濃度より低い
ことを特徴とする請求項2に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。 - フィールド酸化領域及びポリシリコン構造を有し、
前記フィールド酸化領域は、前記Nウェルの表面に設けられ、2つの前記フィールド酸化領域は、前記ドレインを挟むように構成され、
前記ポリシリコン構造は、前記フィールド酸化領域の表面と前記ソースの表面を亘って接続するように構成されている
ことを特徴とする請求項1に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。 - 前記Nウェル内且つフィールド酸化領域の下方に設けられるフローティング層Pウェルを有することを特徴とする請求項4に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 前記介挿式ウェルの幅は前記ドレインの活性領域幅の40%以下になることを特徴とする請求項1に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 前記介挿式ウェルの幅は前記ドレインの活性領域幅の10%〜40%であることを特徴とする請求項6に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 前記ドレインの活性領域の幅は10μmであり、前記第1介挿式ウェル及び前記第2介挿式ウェルの幅は2μm以下であることを特徴とする請求項2に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 前記ウェル領域のドープ濃度は前記ドレインのドープ濃度より低いことを特徴とする請求項1に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 前記基板はPドープ基板であり、前記ドレインはNドープドレインであり、前記ソースはNドープソースであり、前記ボディー領域はPドープボディー領域であることを特徴とする請求項1に記載の横方向拡散金属酸化物半導体電界効果トランジスタ。
- 基板を提供するステップと、
フォトリソグラフィによって前記基板上に被覆されたフォトレジストで隔てられ介挿式ウェルの位置を確保するNウェル注入口を前記基板に形成するとともに、前記Nウェル注入口を介して前記基板内にN型イオンを注入するステップと、
ドライブイン熱処理によってNウェルを形成するステップと、
前記基板内にP型イオンを注入するとともにドライブイン熱処理を行うことによって、前記Nウェルに介挿する前記介挿式ウェルと、前記Nウェルの隣に形成されるとともに前記Nウェルに接するPウェルとを形成するステップと、
活性領域及びフィールド酸化領域を形成するステップと、
ソース、及び前記介挿式ウェルの上方に形成されるとともに前記介挿式ウェルに接するドレインを形成するステップと
を含むことを特徴とする横方向拡散金属酸化物半導体電界効果トランジスタの製造方法。 - 前記ドライブイン熱処理によってNウェルを形成するステップは、基板内にP型イオンを注入する前記ステップにおける自動位置合わせ注入構造として前記Nウェルの表面に酸化層を形成するステップを含むことを特徴とする請求項11に記載の横方向拡散金属酸化物半導体電界効果トランジスタの製造方法。
- 基板を提供するステップと、
フォトリソグラフィによって前記基板上に被覆されたフォトレジストで隔てられ第1介挿式ウェルの位置を確保する第1Nウェル注入口を前記基板に形成するとともに、前記第1Nウェル注入口を介して基板内にN型イオンを注入するステップと、
ドライブイン熱処理によって第1Nウェルを形成するステップと、
前記基板内にP型イオンを注入するとともにドライブイン熱処理を行うことによって、前記第1Nウェルに介挿する前記第1介挿式ウェルと、前記第1Nウェルの隣に形成されるとともに前記第1Nウェルに接する第1Pウェルとを形成するステップと、
前記基板に第1エピタキシャル層を形成するステップと、
フォトリソグラフィを行うとともに前記第1エピタキシャル層にN型イオンを注入し、ドライブイン熱処理を行った後、前記第1Nウェルの上方に前記第1Nウェルに接する第2Nウェルを形成するステップと、
前記第2Nウェル内にP型イオンを注入するとともにドライブイン熱処理を行うことによって、第2Nウェルに介挿し、第1介挿式ウェルの上方に形成されるとともに前記第1介挿式ウェルに接する第2介挿式ウェル、及び前記第1Pウェルの上方に形成されるとともに前記第1Pウェルに接する第2Nウェルの隣の第2Pウェルを形成するステップと、
活性領域及びフィールド酸化領域を形成するステップと、
ソース、及び前記第2介挿式ウェルの上方に形成されるとともに前記第2介挿式ウェルに接するドレインを形成するステップと、
を含むことを特徴とする横方向拡散金属酸化物半導体電界効果トランジスタの製造方法。 - 前記ドライブイン熱処理によって第1Nウェルを形成するステップは、基板内にP型イオンを注入する前記ステップにおける自動位置合わせ注入構造として前記第1Nウェルの表面に酸化層を形成するステップを含むことを特徴とする請求項13に記載の横方向拡散金属酸化物半導体電界効果トランジスタの製造方法。
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