JP2009099714A - 半導体装置とその製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 106
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000010410 layer Substances 0.000 claims abstract description 84
- 230000005669 field effect Effects 0.000 claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 239000002344 surface layer Substances 0.000 claims abstract description 33
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 27
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 27
- 230000015556 catabolic process Effects 0.000 abstract description 10
- 239000012535 impurity Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000002019 doping agent Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- -1 phosphorus ions Chemical class 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
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- 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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- 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]
- H01L29/0619—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 supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
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- H01L29/66068—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/0692—Surface layout
- H01L29/0696—Surface layout of cellular field-effect devices, e.g. multicellular DMOS transistors or IGBTs
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Abstract
【解決手段】第1導電型の半導体基板の主表面上に形成された第1導電型の半導体層と、半導体層の表層部に形成された第2導電型のベース領域と、ベース領域の表層部に形成された第1導電型のソース領域と、ベース領域及びソース領域上に形成されたソース電極と、半導体層及びベース領域上にゲート絶縁膜を介して形成されたゲート電極と、半導体基板の裏面上に形成されたドレイン電極と、を有する電界効果トランジスタの複数を含み、複数が互いに並置された半導体装置であって、ゲート電極の下の半導体層の表層部の所定領域に柱状の第2導電型の中間領域が形成されている。また、中間領域及びベース領域と接触するように半導体層の表層部の所定領域に第2導電型の接続領域が形成されている。
【選択図】図1
Description
11a〜11c ベース領域
12a〜12c ソース領域
13a〜13c ソース電極
14 ゲート絶縁膜
15 ゲート電極
4 中間領域
5a〜5c 接続領域
6 N+型SiC基板
7 N-型SiCエピタキシャル層
8 ドレイン電極
100a〜100b FLR
Claims (6)
- 第1導電型の半導体基板と、前記半導体基板の主表面上に形成され前記半導体基板よりも高抵抗な第1導電型の半導体層と、前記半導体層の表層部の所定領域に形成された第2導電型のベース領域と、前記ベース領域の表層部の所定領域に形成された第1導電型のソース領域と、前記ベース領域及び前記ソース領域と接触するように形成されたソース電極と、前記半導体層及び前記ベース領域上にゲート絶縁膜を介して形成されたゲート電極と、前記半導体基板の裏面上に形成されたドレイン電極と、を有する電界効果トランジスタの複数を含み、前記複数が互いに並置された半導体装置であって、
前記ゲート電極の下の半導体層の表層部の所定領域に形成された柱状の第2導電型の中間領域と、
前記中間領域及び前記ベース領域と接触するように前記半導体層の表層部の所定領域に形成された第2導電型の接続領域と、を有することを特徴とする半導体装置。 - 前記ゲート電極の下の半導体層の表層部の所定領域は、前記複数の電界効果トランジスタのうち互いに隣接する少なくとも3つによって囲まれた領域の中心部であることを特徴とする請求項1記載の半導体装置。
- 前記接続領域は、前記中間領域及び前記中間領域を囲む互いに隣接する電界効果トランジスタの各々のベース領域と接触するように形成されていることを特徴とする請求項2記載の半導体装置。
- 前記中間領域は、互いに隣接する3つの電界効果トランジスタによって囲まれており、三角柱をしていることを特徴とする請求項2記載の半導体装置。
- 前記半導体基板及び前記半導体層は、炭化珪素からなることを特徴とする請求項1乃至請求項4に記載の半導体装置。
- 第1導電型の半導体基板の主表面上に前記半導体基板よりも高抵抗な第1導電型の半導体層を形成する工程と、前記半導体層の表層部の所定領域に第2導電型のベース領域を形成する工程と、前記ベース領域の表層部の所定領域に第1導電型のソース領域を形成する工程と、前記ベース領域及び前記ソース領域と接触するようにソース電極を形成する工程と、前記半導体層及び前記ベース領域上にゲート絶縁膜を介してゲート電極を形成する工程と、前記半導体基板の裏面上にドレイン電極を形成する工程と、を含む半導体装置の製造方法であって、
前記ゲート電極の下の半導体層の表層部の所定領域に柱状の第2導電型の中間領域を形成する工程と、
前記中間領域及び前記ベース領域と接触するように前記半導体層の表層部の所定領域に第2導電型の接続領域を形成する工程と、を有することを特徴とする半導体装置の製造方法。
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Cited By (14)
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WO2011122670A1 (ja) * | 2010-03-30 | 2011-10-06 | ローム株式会社 | 半導体装置 |
JP2011258635A (ja) * | 2010-06-07 | 2011-12-22 | Mitsubishi Electric Corp | 半導体装置 |
WO2013122190A1 (ja) * | 2012-02-17 | 2013-08-22 | ローム株式会社 | 半導体装置 |
WO2013147276A1 (ja) * | 2012-03-30 | 2013-10-03 | 富士電機株式会社 | 縦型高耐圧半導体装置および縦型高耐圧半導体装置の製造方法 |
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