JP6070333B2 - 半導体装置の製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 64
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 239000012535 impurity Substances 0.000 claims description 184
- 238000009792 diffusion process Methods 0.000 claims description 67
- 239000000758 substrate Substances 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 description 7
- 210000000746 body region Anatomy 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 5
- 239000012212 insulator Substances 0.000 description 5
- -1 Boron ions Chemical class 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910001439 antimony ion Inorganic materials 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
- 239000000470 constituent Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/74—Making of localized buried regions, e.g. buried collector layers, internal connections substrate contacts
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/761—PN junctions
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/823481—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type isolation region manufacturing related aspects, e.g. to avoid interaction of isolation region with adjacent structure
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66674—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/66681—Lateral DMOS transistors, i.e. LDMOS transistors
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- 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
- H01L29/70—Bipolar devices
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- H01L29/73—Bipolar junction transistors
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- 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
- H01L29/7816—Lateral DMOS transistors, i.e. LDMOS transistors
- H01L29/7823—Lateral DMOS transistors, i.e. LDMOS transistors with an edge termination structure
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Description
この態様によれば、第2不純物領域の不純物を注入する前に、予め、第1の熱処理により、第1埋め込み拡散層と第1不純物領域とが接続されない程度に、第1埋め込み拡散層と第1不純物領域とを半導体基板の厚み方向に拡散させる。その後、第2不純物領域の不純物を注入し、第2の熱処理により、第1埋め込み拡散層と第1不純物領域と第2不純物領域とを拡散させる。これにより、第2不純物領域の熱処理時間を低減し、第2不純物領域の拡大を抑制することにより、素子面積の縮小が可能となる。
これによれば、第2不純物領域に囲まれた領域の全域を第1不純物領域とすることができる。
これによれば、素子の分離を確実に行うことができる。
これによれば、第2導電型の不純物が第1導電型の不純物よりも拡散しやすくなる。そして、第1導電型の第2不純物領域等を拡散させるための第2の熱処理後に、第2導電型の不純物を拡散させる工程で、第1導電型の第2不純物領域が一層拡散してしまうことを抑制できる。
図1は、本発明の実施形態に係る製造方法によって製造される半導体装置の一例を示す断面図である。図1に示される半導体装置1は、下地層10p及びエピタキシャル層20pを備えた半導体基板30に、第1埋め込み拡散層11nと、第1不純物領域21nと、第2不純物領域22nと、第2埋め込み拡散層12pと、第5不純物領域25pとを備えている。本実施形態においては、半導体装置1の各部分の符号に、その導電型に応じた「n」又は「p」の文字を付加して説明する。本実施形態においては、n型が第1導電型に相当し、p型が第2導電型に相当するものとするが、n型とp型とを逆にしてもよい。
図2〜図4は、本発明の実施形態に係る半導体装置の製造方法を示す断面図である。まず、図2(A)に示されるように、第2導電型の半導体基板30の下地層10pに、第1導電型の不純物を注入(例えば、アンチモンイオン、加速電圧30〜60KeV、ドーズ量1〜5×1015/cm2)して、熱拡散(例えば1100〜1200℃、3〜5時間)することにより、第3不純物領域11naを形成するとともに、第2導電型の不純物を注入(例えば、ボロンイオン、加速電圧40〜100KeV、ドーズ量1×1013〜2×1014/cm2)することにより、第4不純物領域12paを形成する。
次に、図4(H)に示されるように、半導体基板30の第1の面31に第2導電型の不純物を注入(例えば、ボロンイオン、加速電圧80〜600KeV、ドーズ量5×1012〜5×1013/cm2)することにより、第5不純物領域25pを形成する。第5不純物領域25pは、第1の面31に対する平面視で第2埋め込み拡散層12pと重なる領域に形成される。
Claims (5)
- 第1導電型の不純物を含む第1導電型の第1埋め込み拡散層を、第2導電型の半導体基板の内部に形成する工程(a)と、
前記半導体基板の第1の面の第1の領域に、第1導電型の不純物を注入することにより、第1不純物領域を形成する工程(b)と、
前記半導体基板に第1の熱処理を行うことにより、前記第1埋め込み拡散層と前記第1不純物領域とが接続されない程度に、前記第1埋め込み拡散層と前記第1不純物領域とを少なくとも前記半導体基板の厚み方向に拡散させる工程(c)と、
工程(c)の後に、前記第1の面の前記第1の領域の周囲の第2の領域に、第1導電型の不純物を工程(b)におけるよりも高濃度で注入することにより、第2不純物領域を形成する工程(d)と、
前記半導体基板に第2の熱処理を行うことにより、前記第1埋め込み拡散層と前記第1不純物領域とが互いに接続され、且つ、前記第1埋め込み拡散層と前記第2不純物領域とが互いに接続されるように、前記第1埋め込み拡散層と前記第1不純物領域と前記第2不純物領域とを少なくとも前記半導体基板の厚み方向に拡散させる工程(e)と、
を含む半導体装置の製造方法。 - 工程(e)は、さらに、前記第1不純物領域と前記第2不純物領域とが互いに接続されるように、前記第1不純物領域と前記第2不純物領域とを前記半導体基板の前記第1の面に沿った方向にも拡散させる工程である、請求項1記載の半導体装置の製造方法。
- 工程(a)は、第2導電型の不純物を含む第2導電型の第2埋め込み拡散層を、第2導電型の前記半導体基板の内部であって前記第1の面に対する平面視で前記第1埋め込み拡散層の周囲の領域に形成することをさらに含み、
工程(d)の後に、前記第1の面に対する平面視で前記第2埋め込み拡散層と重なる前記第1の面の第3の領域に、第2導電型の不純物を注入する工程(f)をさらに含む、
請求項1又は請求項2記載の半導体装置の製造方法。 - 前記第2埋め込み拡散層に含まれる第2導電型の不純物、及び、工程(f)において注入される第2導電型の不純物は、前記第1埋め込み拡散層に含まれる第1導電型の不純物、工程(b)において注入される第1導電型の不純物、及び、工程(d)において注入される第1導電型の不純物よりも原子量が小さい元素のイオンを含む、請求項3記載の半導体装置の製造方法。
- 工程(a)は、第2導電型の前記半導体基板に第1導電型の不純物を注入することにより第3不純物領域を形成し、その後に、前記第3不純物領域の上に第2導電型のエピタキシャル層を形成することにより、前記第1埋め込み拡散層を形成する工程である、請求項1乃至請求項4のいずれか一項記載の半導体装置の製造方法。
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JP2013062056A JP6070333B2 (ja) | 2013-03-25 | 2013-03-25 | 半導体装置の製造方法 |
US14/196,654 US9012312B2 (en) | 2013-03-25 | 2014-03-04 | Semiconductor device manufacturing method |
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JP6364898B2 (ja) * | 2014-04-07 | 2018-08-01 | セイコーエプソン株式会社 | 半導体装置 |
CN104681621B (zh) * | 2015-02-15 | 2017-10-24 | 上海华虹宏力半导体制造有限公司 | 一种源极抬高电压使用的高压ldmos及其制造方法 |
JP2017112219A (ja) | 2015-12-16 | 2017-06-22 | セイコーエプソン株式会社 | 半導体装置及びその製造方法 |
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JPS60105223A (ja) * | 1983-11-14 | 1985-06-10 | Toshiba Corp | 半導体装置の製造方法 |
JPS60194559A (ja) * | 1984-03-16 | 1985-10-03 | Hitachi Ltd | 半導体装置とその製造方法 |
DE3787407D1 (de) * | 1986-07-04 | 1993-10-21 | Siemens Ag | Integrierte Bipolar- und komplementäre MOS-Transistoren auf einem gemeinsamen Substrat enthaltende Schaltung und Verfahren zu ihrer Herstellung. |
JPH02119162A (ja) * | 1988-10-28 | 1990-05-07 | Fuji Electric Co Ltd | 半導体集積回路装置の製造方法 |
JPH03218634A (ja) * | 1989-11-10 | 1991-09-26 | Toyota Autom Loom Works Ltd | 半導体装置およびその製造方法 |
JPH03209760A (ja) * | 1990-01-11 | 1991-09-12 | Mitsubishi Electric Corp | 半導体装置 |
JPH05326857A (ja) * | 1992-05-20 | 1993-12-10 | Nippon Telegr & Teleph Corp <Ntt> | 半導体装置の製造方法 |
US5556796A (en) * | 1995-04-25 | 1996-09-17 | Micrel, Inc. | Self-alignment technique for forming junction isolation and wells |
JP3918220B2 (ja) * | 1997-02-27 | 2007-05-23 | ソニー株式会社 | 半導体装置及びその製造方法 |
US6784489B1 (en) | 1997-03-28 | 2004-08-31 | Stmicroelectronics, Inc. | Method of operating a vertical DMOS transistor with schottky diode body structure |
US5925910A (en) | 1997-03-28 | 1999-07-20 | Stmicroelectronics, Inc. | DMOS transistors with schottky diode body structure |
JP2003017603A (ja) * | 2001-06-28 | 2003-01-17 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JP5048242B2 (ja) * | 2005-11-30 | 2012-10-17 | オンセミコンダクター・トレーディング・リミテッド | 半導体装置及びその製造方法 |
US7791171B2 (en) * | 2007-02-09 | 2010-09-07 | Sanyo Electric Co., Ltd. | Semiconductor device and method of manufacturing the same |
JP2013149925A (ja) * | 2012-01-23 | 2013-08-01 | Toshiba Corp | 半導体装置及びその製造方法 |
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US20140287573A1 (en) | 2014-09-25 |
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