JP2021064672A - 炭化珪素半導体装置およびその製造方法 - Google Patents
炭化珪素半導体装置およびその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 44
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 124
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 124
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 238000005224 laser annealing Methods 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims description 54
- 239000002184 metal Substances 0.000 claims description 54
- 239000010409 thin film Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 17
- 229910021332 silicide Inorganic materials 0.000 claims description 12
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910005883 NiSi Inorganic materials 0.000 claims 2
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 24
- 238000005452 bending Methods 0.000 description 12
- 239000010408 film Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 239000010936 titanium Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 238000005498 polishing Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000000859 sublimation Methods 0.000 description 3
- 230000008022 sublimation Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000013532 laser treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 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
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Abstract
Description
以下、本発明を図に示す実施形態について説明する。まず、図1を参照して、本実施形態にかかるSiC半導体装置について説明する。本実施形態では、SiC半導体素子としてのプレーナ型の縦型パワーMOSFETを備えるSiC半導体装置について説明する。本SiC半導体装置は、例えばインバータに適用すると好適なものである。
本開示は、上記した実施形態に準拠して記述されたが、当該実施形態に限定されるものではなく、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。
1b 裏面
10 ソース電極
11 ドレイン電極
50 レーザ光
110 金属薄膜
Claims (6)
- 主表面(1a)および裏面(1b)を有する炭化珪素半導体基板(1)と、該炭化珪素半導体基板の前記主表面側と前記裏面側の少なくとも一方において、炭化珪素の一面とオーミック接合させられたオーミック電極(11)とを有する炭化珪素半導体装置であって、
前記オーミック電極は、前記炭化珪素の一面上において点在させられていて凹凸を構成しており、該オーミック電極による凹凸高さ(H1)が1.0μm未満になっている炭化珪素半導体装置。 - 前記オーミック電極は、NiSiと該NiSiの内側に配置されたMoCとが点在されることで前記凹凸を構成している、請求項1に記載の炭化珪素半導体装置。
- 主表面(1a)および裏面(1b)を有する炭化珪素半導体基板(1)と、該炭化珪素半導体基板の前記主表面側と前記裏面側の少なくとも一方において、炭化珪素の一面にオーミック接合させられるオーミック電極(11)を形成する炭化珪素半導体装置の製造方法であって、
前記オーミック接合させられる前記炭化珪素上に、シリサイドとカーバイドの少なくとも一方を構成する金属材料で構成された金属薄膜(110)を形成することと、
前記金属薄膜に対してレーザ光(50)を照射し、前記金属薄膜と前記炭化珪素中のSiまたはCと反応させて、金属シリサイドと金属カーバイドの少なくとも一方を生成するレーザアニールを行って前記オーミック電極を形成することと、を含み、
前記レーザアニールをトップハット型のレーザにて行う、炭化珪素半導体装置の製造方法。 - 前記金属薄膜を形成することの前に、前記炭化珪素半導体基板のうち前記オーミック電極を形成する側を除去して薄膜化することを含み、
前記薄膜化することの後における前記炭化珪素の一面の表面粗さRaを5nm以下にする、請求項3に記載の炭化珪素半導体装置の製造方法。 - 前記金属薄膜を構成する前記金属材料として、Ni、Mo、Ti、W、Nb、Taの少なくとも1つを用い、
前記金属薄膜を形成することでは、該金属薄膜の厚みを50〜250nmとする、請求項3または4に記載の炭化珪素半導体装置の製造方法。 - 前記レーザアニールを行って前記オーミック電極を形成することでは、前記レーザのエネルギー密度を2.5〜3.0J/cm2とし、該レーザをスポット照射によって行うと共にスポットの径に対する重複長さの割合となるオーバラップ率を50〜80%とする、請求項3ないし5のいずれか1つに記載の炭化珪素半導体装置の製造方法。
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US17/065,062 US11387326B2 (en) | 2019-10-11 | 2020-10-07 | Silicon carbide semiconductor device and method for manufacturing the same |
CN202011071147.1A CN112652655A (zh) | 2019-10-11 | 2020-10-09 | 碳化硅半导体器件及其制造方法 |
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