JP2020013828A - 半導体装置および製造方法 - Google Patents
半導体装置および製造方法 Download PDFInfo
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- JP2020013828A JP2020013828A JP2018133496A JP2018133496A JP2020013828A JP 2020013828 A JP2020013828 A JP 2020013828A JP 2018133496 A JP2018133496 A JP 2018133496A JP 2018133496 A JP2018133496 A JP 2018133496A JP 2020013828 A JP2020013828 A JP 2020013828A
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- titanium
- semiconductor substrate
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 187
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 239000010410 layer Substances 0.000 claims abstract description 177
- 239000000758 substrate Substances 0.000 claims abstract description 151
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 131
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 131
- 239000010936 titanium Substances 0.000 claims abstract description 131
- 239000011229 interlayer Substances 0.000 claims abstract description 55
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000137 annealing Methods 0.000 claims description 51
- 229910021341 titanium silicide Inorganic materials 0.000 claims description 44
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- 239000010937 tungsten Substances 0.000 claims description 35
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- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 49
- 239000002184 metal Substances 0.000 abstract description 49
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- 229910008484 TiSi Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
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Classifications
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- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/8611—Planar PN junction diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/8613—Mesa PN junction diodes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
特許文献1 特開2016−225512号公報
特許文献2 特開2000−195819号公報
特許文献3 特許第5672719号
特許文献4 特開平6−97111号公報
Claims (12)
- 半導体基板と、
前記半導体基板の上面に配置された層間絶縁膜と、
前記層間絶縁膜上に設けられたチタン層と、
前記チタン層上に設けられた窒化チタン層と
を備え、
前記層間絶縁膜には、前記半導体基板の上面の一部を露出させる開口が設けられ、
前記チタン層および前記窒化チタン層は、前記開口内にも設けられており、
前記開口の底部において前記半導体基板と接して配置された前記チタン層は、全体がチタンシリサイド化している半導体装置。 - 前記開口内において、前記窒化チタン層上に設けられたタングステンプラグを更に備える
請求項1に記載の半導体装置。 - 前記開口以外の領域において前記層間絶縁膜上に設けられた前記チタン層は、チタンシリサイド化した部分を含まないチタン層である
請求項1または2に記載の半導体装置。 - 前記開口以外の領域において前記層間絶縁膜上に設けられた前記チタン層の厚みは、30nm以上、45nm以下である
請求項1から3のいずれか一項に記載の半導体装置。 - 前記開口における前記層間絶縁膜の側壁の少なくとも一部は、上方に凸の曲面形状を有する
請求項1から4のいずれか一項に記載の半導体装置。 - 前記半導体基板は、
前記半導体基板の上面から内部まで設けられ、前記半導体基板の上面において予め定められた配列方向に並んで設けられた複数のトレンチ部と、
2つのトレンチ部に前記配列方向において挟まれたメサ部と
を有し、
前記層間絶縁膜は、少なくとも一部の前記トレンチ部の上端を覆って設けられ、
前記開口は、少なくとも一部の前記メサ部の上面を露出させるように設けられ、
少なくとも前記メサ部の前記配列方向における両端の上方において、前記層間絶縁膜の側壁は前記曲面形状を有する
請求項5に記載の半導体装置。 - 前記窒化チタン層上、および、前記タングステンプラグ上に設けられ、チタンシリサイド化していない第2チタン層を更に備える
請求項2に記載の半導体装置。 - 半導体基板の上面に層間絶縁膜を形成する絶縁膜形成段階と、
前記層間絶縁膜に開口を形成して、前記半導体基板の上面の一部を露出させる開口形成段階と、
前記層間絶縁膜上および前記開口内にチタン層を形成するチタン層形成段階と、
前記チタン層上に窒化チタン層を形成する窒化チタン層形成段階と、
前記開口の底部において前記半導体基板と接して配置された前記チタン層の全体をチタンシリサイド化するチタンシリサイド化段階と
を備える製造方法。 - 前記チタンシリサイド化段階において、前記半導体基板を700℃以上でアニールする
請求項8に記載の製造方法。 - 前記チタン層形成段階において、30nm以上、45nm以下の前記チタン層を形成する
請求項8または9に記載の製造方法。 - 前記開口内の前記窒化チタン層上にタングステンプラグを形成するタングステンプラグ形成段階を更に備え、
前記チタンシリサイド化段階において前記半導体基板をアニールする温度は、前記タングステンプラグ形成段階においてタングステンを成膜する温度よりも高い
請求項8から10のいずれか一項に記載の製造方法。 - 前記チタン層形成段階より前に、水素含有雰囲気で前記半導体基板をアニールする水素アニール段階を更に備え、
前記チタンシリサイド化段階において前記半導体基板をアニールする温度は、前記水素アニール段階におけるアニール温度よりも高い
請求項8から11のいずれか一項に記載の製造方法。
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US16/429,087 US11195749B2 (en) | 2018-07-13 | 2019-06-03 | Semiconductor device and manufacturing method |
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WO2024014401A1 (ja) * | 2022-07-11 | 2024-01-18 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
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US11195749B2 (en) | 2021-12-07 |
JP7283036B2 (ja) | 2023-05-30 |
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