JP2000506677A - エピタキシャル層の変動の影響を受けにくい縦形mosfet - Google Patents
エピタキシャル層の変動の影響を受けにくい縦形mosfetInfo
- Publication number
- JP2000506677A JP2000506677A JP9532685A JP53268597A JP2000506677A JP 2000506677 A JP2000506677 A JP 2000506677A JP 9532685 A JP9532685 A JP 9532685A JP 53268597 A JP53268597 A JP 53268597A JP 2000506677 A JP2000506677 A JP 2000506677A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- epitaxial layer
- conductivity type
- region
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 238000000034 method Methods 0.000 claims description 37
- 210000000746 body region Anatomy 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 20
- 238000009792 diffusion process Methods 0.000 claims description 17
- 150000002500 ions Chemical class 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 2
- 239000002800 charge carrier Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 claims 1
- 239000002019 doping agent Substances 0.000 abstract description 38
- 230000015556 catabolic process Effects 0.000 abstract description 33
- 210000004027 cell Anatomy 0.000 description 22
- 238000002513 implantation Methods 0.000 description 11
- 229910052796 boron Inorganic materials 0.000 description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000007943 implant Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 3
- XPIJWUTXQAGSLK-UHFFFAOYSA-N ozenoxacin Chemical compound C1=C(C)C(NC)=NC=C1C1=CC=C2C(=O)C(C(O)=O)=CN(C3CC3)C2=C1C XPIJWUTXQAGSLK-UHFFFAOYSA-N 0.000 description 3
- -1 phosphorus ions Chemical class 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 210000004460 N cell Anatomy 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 210000001744 T-lymphocyte Anatomy 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7803—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device
- H01L29/7808—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a breakdown diode, e.g. Zener diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7811—Vertical DMOS transistors, i.e. VDMOS transistors with an edge termination structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7827—Vertical transistors
- H01L29/7828—Vertical transistors without inversion channel, e.g. vertical ACCUFETs, normally-on vertical MISFETs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0626—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a localised breakdown region, e.g. built-in avalanching region
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
- H01L29/0852—Source or drain regions of field-effect devices of field-effect transistors with insulated gate of DMOS transistors
- H01L29/0873—Drain regions
- H01L29/0878—Impurity concentration or distribution
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1. 縦形トレンチゲート形パワーMOSFETであって、 第1の導電型の半導体基板と、 前記基板上に形成されるエピタキシャル層と、 前記エピタキシャル層の表面から下方に延在するトレンチ内に形成されたゲー トと、 前記エピタキシャル層の表面に隣接して前記エピタキシャル層内に形成される 前記第1の導電型のソース領域と、 前記ソース領域と前記トレンチの壁部とに隣接して前記エピタキシャル層内に 形成される前記第1の導電型と反対の導電型のボディ領域と、 前記基板及び前記ボディ領域に隣接して位置する前記エピタキシャル層の一部 からなるドレインであって、前記エピタキシャル層の前記一部が前記第1の導電 型のイオンを用いて第1の濃度レベルにドープされる、該ドレインと、 前記エピタキシャル層内に形成され、前記基板内に延在する埋込層であって、 前記エピタキシャル層内の前記埋込層の一部が前記第1の導電型のイオンを用い て、前記第1の濃度レベルより大きい第2の濃度レベルにドープされる、該埋込 層とを有することを特徴とする縦形トレンチゲート形パワーMOSFET。 2. 前記埋込層の上側端部が前記トレンチの底部より下のレベルに位置するこ とを特徴とする請求項1に記載のパワーMOSFET。 3. 前記パワーMOSFETのアクティブMOSFETセルの外側に、前記エ ピタキシャル層の前記表面から下方に延在する前記第2の導電型の拡散部をさら に有することを特徴とする請求項2に記載のパワーMOSFET。 4. 前記パワーMOSFETのアクティブMOSFETセルの中央領 域において前記ボディ領域から下方に延在する前記第2の導電型の拡散部をさら に有することを特徴とする請求項2に記載のパワーMOSFET。 5. 前記埋込層の上側端部に隣接する前記エピタキシャル層内の差込領域であ って、前記差込領域は、前記パワーMOSFETのアクティブMOSFETセル の中央領域において前記ボディ領域の下側に位置し、また前記差込領域が前記第 1の導電型のイオンを用いて、前記第1の濃度レベルより大きく、かつ前記第2 の濃度レベルに等しいレベルにドープされる、該差込領域をさらに有することを 特徴とする請求項2に記載のパワーMOSFET。 6. 前記埋込層の上側端部が前記トレンチの底部より上のレベルに位置するこ とを特徴とする請求項1に記載のパワーMOSFET。 7. 前記埋込層が前記パワーMOSFETの末端領域内に延在しないことを特 徴とする請求項1に記載のパワーMOSFET。 8. 前記エピタキシャル層の前記表面に隣接してボディ接触領域をさらに有す ることを特徴とする請求項1に記載のパワーMOSFET。 9. 前記ソース領域と前記ボディ接触領域とを互いに短絡する金属層をさらに 有することを特徴とする請求項8に記載のパワーMOSFET。 10. 前記ボディ領域がアクティブMOSFETセル内の前記エピタキシャル 層の表面に延在しないことを特徴とする請求項1に記載のパワーMOSFET。 11. 前記アクティブMOSFETセル内の前記ボディ領域が、前記ゲートが 前記パワーMOSFETをターンオフするようにバイアスされるとき、概ね完全 に電荷担体が空乏状態にされることを特徴とする請求項10に記載のパワーMO SFET。 12. 前記埋込層の上側端部が前記トレンチの底部より上のレベルに 位置することを特徴とする請求項11に記載のパワーMOSFET。 13. 前記埋込層の上側端部が前記トレンチの底部より上のレベルに位置する ことを特徴とする請求項11に記載のパワーMOSFET。 14. 縦形プレーナ形パワーMOSFETであって、 第1の導電型の半導体基板と、 前記基板上に形成されるエピタキシャル層と、 前記エピタキシャル層の表面から下方に延在するトレンチ内に形成されたゲー トと、 前記エピタキシャル層の表面に隣接して前記エピタキシャル層内に形成される 前記第1の導電型のソース領域と、 前記エピタキシャル層の表面に隣接して前記エピタキシャル層内に形成され、 かつ前記ソース領域に隣接する前記第1の導電型と反対の第2の導電型のボディ 領域と、 前記ボディ領域のチャネル領域の上部をなし、かつ誘電体層により前記エピタ キシャル層から隔離されるゲートと、 前記基板及び前記ボディ領域に隣接して位置する前記エピタキシャル層の一部 からなるドレインであって、前記エピタキシャル層の前記一部が前記第1の導電 型のイオンを用いて第1の濃度レベルにドープされる、該ドレインと、 前記エピタキシャル層内に形成され、前記基板内に延在する埋込層であって、 前記エピタキシャル層内の前記埋込層の一部が前記第1の導電型のイオンを用い て、前記第1の濃度レベルより大きい第2の濃度レベルにドープされる、該埋込 層とを有することを特徴とする縦形トレンチゲート形パワーMOSFET。 15. 前記エピタキシャル層の前記表面から下方に延在する前記第2の導電型 の拡散部であって、前記拡散部が前記MOSFETのブレーク ダウン電圧を確定する、該拡散部をさらに有することを特徴とする請求項14に 記載のパワーMOSFET。 16. 前記拡散部がMOSFETセルの中央部に位置することを特徴とする請 求項15に記載のパワーMOSFET。 17. MOSFETを製造する方法であって、 半導体基板の表面上にエピタキシャル層を形成する過程であって、前記基板と 前記エピタキシャル層のいずれも第1の導電型のイオンを用いてドープされ、ま た前記基板が前記エピタキシャル層より高い濃度レベルにドープされる、該過程 と、 前記第1の導電型の埋込層を形成するように前記エピタキシャル層の表面を通 して前記第1の導電型のイオンを注入する過程と、 前記エピタキシャル層の前記表面から下方に延在するトレンチを形成する過程 と、 前記トレンチの壁部上に誘電体層を形成する過程と、 前記トレンチを導電性ゲート材料で満たす過程であって、前記導電性ゲート材 料が前記誘電体層により前記エピタキシャル層から電気的に絶縁される、該過程 と、 前記エピタキシャル層内に前記第1の導電型と反対の第2の導電型のボディ領 域を形成する過程と、 前記エピタキシャル層内に前記第1の導電型のソース領域を形成する過程とを 有し、 前記方法の完了段階で、前記埋込層が前記基板と前記エピタキシャル層との間 の境界面を横切って延在することを特徴とするMOSFET製造方法。 18. 前記埋込層が、前記トレンチが形成される前に形成されることを特徴と する請求項17に記載の方法。 19. 前記埋込層が、前記ボディ領域が形成された後で、かつ前記ソース領域 が形成される前に形成されることを特徴とする請求項17に記載の方法。 20. 前記埋込層が、前記ソース領域を形成した後に形成されることを特徴と する請求項17に記載の方法。 21. 前記エピタキシャル層内にボディ接触領域を形成する過程であって、前 記埋込層が前記ボディ接触領域の形成後に形成される、該過程をさらに有するこ とを特徴とする請求項17に記載の方法。 22. 前記トレンチ上に酸化物層を形成する過程であって、前記埋込層が前記 酸化物層の形成後に形成される、該過程をさらに有することを特徴とする請求項 17に記載の方法。 23. MOSFETを製造する方法であって、 半導体基板の表面上にエピタキシャル層を形成する過程であって、前記基板と 前記エピタキシャル層のいずれも第1の導電型のイオンを用いてドープされ、ま た前記基板が前記エピタキシャル層より高い濃度レベルにドープされる、該過程 と、 前記第1の導電型の埋込層を形成するように前記エピタキシャル層の表面を通 して前記第1の導電型のイオンを注入する過程と、 前記エピタキシャル層の前記表面上に誘電体層を形成する過程と、 前記誘電体層上にゲートを形成する過程と、 前記エピタキシャル層内に前記第1の導電型と反対の第2の導電型のボディ領 域を形成する過程と、 前記エピタキシャル層内に前記第1の導電型のソース領域を形成する過程とを 有し、 前記方法の完了段階で、前記埋込層が前記基板と前記エピタキシャル層との間 の境界面を横切って延在することを特徴とするMOSFET製 造方法。 24. 前記埋込層が前記ゲートが形成される前に形成されることを特徴とする 請求項23に記載の方法。 25. MOSFETを製造する方法であって、 第1の導電型のイオンを用いてドープされた半導体基板を与える過程と、 前記基板内に前記第1の導電型の層を形成するように、前記第1の導電型のイ オンを前記基板内に注入する過程と、 半導体基板の表面上にエピタキシャル層を形成する過程であって、前記エピタ キシャル層が前記第1の導電型のイオンを用いてドープされる、該過程と、 前記第1の導電型の前記層内のイオンが、前記基板と前記エピタキシャル層と の境界面を横切って拡散できるようにする過程と、 前記エピタキシャル層の前記表面から下方に延在するトレンチを形成する過程 と、 前記トレンチの壁部上に誘電体層を形成する過程と、 前記誘電体層を導電性ゲート材料で満たす過程であって、前記導電性ゲート材 料が、前記誘電体層により前記エピタキシャル層から電気的に絶縁される、該過 程と、 前記エピタキシャル層内に前記第1の導電型と反対の第2の導電型のボディ領 域を形成する過程と、 前記エピタキシャル層内に前記第1の導電型のソース領域を形成する過程とを 有し、 前記方法の完了時に、前記第1の導電型のイオンの前記層が、前記基板と前記 エピタキシャル層との境界面を横切って、かつ前記トレンチの底部より高いレベ ルまで上方に延在することを特徴とするMOSFET の製造方法。
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US616,393 | 1996-03-15 | ||
US08/616,393 US5814858A (en) | 1996-03-15 | 1996-03-15 | Vertical power MOSFET having reduced sensitivity to variations in thickness of epitaxial layer |
PCT/US1997/003484 WO1997034324A1 (en) | 1996-03-15 | 1997-03-14 | Vertical power mosfet having reduced sensitivity to variations in thickness of epitaxial layer |
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US (1) | US5814858A (ja) |
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1996
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1997
- 1997-03-14 WO PCT/US1997/003484 patent/WO1997034324A1/en not_active Application Discontinuation
- 1997-03-14 JP JP9532685A patent/JP2000506677A/ja active Pending
- 1997-03-14 EP EP97908898A patent/EP0956596A1/en not_active Withdrawn
Cited By (8)
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JP2011035410A (ja) * | 1997-10-31 | 2011-02-17 | Siliconix Inc | 保護用ダイオードを備えるトレンチゲート形パワーmosfet |
JP2001036071A (ja) * | 1999-07-16 | 2001-02-09 | Toshiba Corp | 半導体装置の製造方法 |
JP2003536274A (ja) * | 2000-06-16 | 2003-12-02 | ゼネラル セミコンダクター,インク. | 二重拡散ボディプロファイルを有するトレンチ金属酸化膜半導体電界効果トランジスタ |
KR100759937B1 (ko) | 2000-06-16 | 2007-09-19 | 제네럴 세미컨덕터, 인코포레이티드 | 트렌치 mosfet 디바이스, 및 이러한 트렌치 mosfet 디바이스를 형성하는 방법 |
JP2020167337A (ja) * | 2019-03-29 | 2020-10-08 | ローム株式会社 | 半導体装置 |
JP7405517B2 (ja) | 2019-03-29 | 2023-12-26 | ローム株式会社 | 半導体装置 |
CN112051450A (zh) * | 2020-08-31 | 2020-12-08 | 华虹半导体(无锡)有限公司 | 获取晶圆边缘的导通电阻的方法 |
CN112051450B (zh) * | 2020-08-31 | 2023-09-12 | 华虹半导体(无锡)有限公司 | 获取晶圆边缘的导通电阻的方法 |
Also Published As
Publication number | Publication date |
---|---|
US5814858A (en) | 1998-09-29 |
EP0956596A1 (en) | 1999-11-17 |
EP0956596A4 (ja) | 1999-12-08 |
WO1997034324A1 (en) | 1997-09-18 |
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