JP2021118192A - 炭化珪素半導体装置の製造方法 - Google Patents
炭化珪素半導体装置の製造方法 Download PDFInfo
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- JP2021118192A JP2021118192A JP2020008145A JP2020008145A JP2021118192A JP 2021118192 A JP2021118192 A JP 2021118192A JP 2020008145 A JP2020008145 A JP 2020008145A JP 2020008145 A JP2020008145 A JP 2020008145A JP 2021118192 A JP2021118192 A JP 2021118192A
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 286
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 117
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 202
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 77
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 69
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910021334 nickel silicide Inorganic materials 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 57
- 239000007769 metal material Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 41
- 239000010936 titanium Substances 0.000 claims description 33
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 31
- 229910052719 titanium Inorganic materials 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 24
- 150000001875 compounds Chemical class 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 46
- 239000012535 impurity Substances 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 17
- WYFCZWSWFGJODV-MIANJLSGSA-N 4-[[(1s)-2-[(e)-3-[3-chloro-2-fluoro-6-(tetrazol-1-yl)phenyl]prop-2-enoyl]-5-(4-methyl-2-oxopiperazin-1-yl)-3,4-dihydro-1h-isoquinoline-1-carbonyl]amino]benzoic acid Chemical compound O=C1CN(C)CCN1C1=CC=CC2=C1CCN(C(=O)\C=C\C=1C(=CC=C(Cl)C=1F)N1N=NN=C1)[C@@H]2C(=O)NC1=CC=C(C(O)=O)C=C1 WYFCZWSWFGJODV-MIANJLSGSA-N 0.000 description 16
- 229910052710 silicon Inorganic materials 0.000 description 13
- 229910000838 Al alloy Inorganic materials 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 230000002829 reductive effect Effects 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 239000011229 interlayer Substances 0.000 description 10
- 238000002161 passivation Methods 0.000 description 10
- 229910021332 silicide Inorganic materials 0.000 description 10
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 8
- 238000005530 etching Methods 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 7
- 238000000206 photolithography Methods 0.000 description 7
- 238000001312 dry etching Methods 0.000 description 6
- 230000002441 reversible effect Effects 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 238000004380 ashing Methods 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000001039 wet etching Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Substances CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005240 physical vapour deposition Methods 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- -1 for example Chemical compound 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- FMKGJQHNYMWDFJ-CVEARBPZSA-N 2-[[4-(2,2-difluoropropoxy)pyrimidin-5-yl]methylamino]-4-[[(1R,4S)-4-hydroxy-3,3-dimethylcyclohexyl]amino]pyrimidine-5-carbonitrile Chemical compound FC(COC1=NC=NC=C1CNC1=NC=C(C(=N1)N[C@H]1CC([C@H](CC1)O)(C)C)C#N)(C)F FMKGJQHNYMWDFJ-CVEARBPZSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910018098 Ni-Si Inorganic materials 0.000 description 1
- 229910005881 NiSi 2 Inorganic materials 0.000 description 1
- 229910018529 Ni—Si Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- IZQZNLBFNMTRMF-UHFFFAOYSA-N acetic acid;phosphoric acid Chemical compound CC(O)=O.OP(O)(O)=O IZQZNLBFNMTRMF-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical group [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 229940127113 compound 57 Drugs 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000005224 laser annealing Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002815 nickel Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- H01L21/0445—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 crystalline silicon carbide
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Abstract
Description
実施の形態にかかる炭化珪素半導体装置の構造について説明する。図1および図2は、実施の形態にかかる炭化珪素半導体装置を半導体基板のおもて面側から見たレイアウトを示す平面図である。図1には、JBS構造を構成するp型領域(第1の第2導電型領域)13のレイアウトの一例を示す。図2には、炭化珪素(SiC)からなる半導体基板(半導体チップ)30のおもて面上の各部のうち、ボンディングパッド41のレイアウトの一例を図示する。
11 n+型出発基板
12 n-型ドリフト領域
13,72,74 JBS構造を構成するp型領域
14 おもて面電極
15 フィールド酸化膜
15’ 酸化膜(酸化膜マスク)のうち、活性領域においてn-型ドリフト領域を覆
う部分
15a フィールド酸化膜のコンタクトホール
16 熱酸化膜
17 堆積酸化膜
18 パッシベーション膜
18a パッシベーション膜の開口部
19 裏面電極
20 エッジ終端領域
20a エッジ終端領域のつなぎ領域
21 フィールドリミッティングリング(FLR)
22 JTE構造を構成するp-型領域
23 JTE構造を構成するp--型領域
24 n+型チャネルストッパー領域
30 半導体基板
31 チタン膜
32 アルミニウム合金膜
33(33a,33b) ニッケルシリサイド膜(第1,2ニッケルシリサイド膜)
40 炭化珪素半導体装置
41 ボンディングパッド
42 ボンディングパッドとワイヤーとの接合部
50 カーボン保護膜
51 酸化膜(酸化膜マスク)
51a,51b 酸化膜(酸化膜マスク)の開口部
52 金属材料膜
53 アルミニウム膜
54 第2ニッケル膜
55 アルミニウム−ニッケル−シリコン(Al−Ni−Si)化合物
56 アルミニウムニッケル化合物
57 レジスト膜
58 第1ニッケル膜
61〜64 熱拡散
w1 JBS構造を構成するp型領域の幅
w2a 第1ニッケルシリサイド膜の幅
w2b 第2ニッケルシリサイド膜の幅
w3 エッジ終端領域のつなぎ領域の幅
Claims (9)
- 炭化珪素からなる半導体基板の内部に、前記半導体基板の第1主面をなす第1導電型領域を形成する第1工程と、
前記半導体基板の第1主面側における前記第1導電型領域の表面領域に、第1の第2導電型領域を選択的に形成する第2工程と、
前記半導体基板の第1主面に、前記第1導電型領域および前記第1の第2導電型領域を覆う酸化膜を形成する第3工程と、
前記酸化膜を選択的に除去して、前記第1の第2導電型領域を露出する第1開口部を前記酸化膜に形成する第4工程と、
前記酸化膜の前記第1開口部において前記半導体基板の第1主面に接する、第1ニッケル膜、アルミニウム膜、アルミニウムよりも融点が高い金属膜を順に積層して金属材料膜を形成する第5工程と、
第1熱処理により前記金属材料膜と前記半導体基板とを反応させて、前記酸化膜の前記第1開口部における前記半導体基板の第1主面上に、前記酸化膜をマスクとして自己整合的に化合物層を生成する第6工程と、
前記第6工程の後、前記金属材料膜の、前記化合物層を除く余剰部分を除去する第7工程と、
前記第7工程の後、前記第1熱処理よりも高温度の第2熱処理により、前記化合物層の内部にニッケルシリサイドを生成して、前記半導体基板にオーミック接合するニッケルシリサイド膜を形成する第8工程と、
前記第8工程の後、前記ニッケルシリサイド膜に挟まれた前記酸化膜を除去して前記第1開口部のすべてをつなげてなるコンタクトホールを形成する第9工程と、
前記コンタクトホールの内部において前記半導体基板の第1主面上に、前記第1導電型領域に接触して前記第1導電型領域とショットキー接合するチタン膜と、アルミニウムを含む金属電極膜と、を順に積層して第1電極を形成する第10工程と、
前記半導体基板の第2主面に第2電極を形成する第11工程と、
を含むことを特徴とする炭化珪素半導体装置の製造方法。 - 前記アルミニウムよりも融点が高い金属膜は、第2ニッケル膜であることを特徴とする請求項1に記載の炭化珪素半導体装置の製造方法。
- 前記金属材料膜の膜厚に対する前記アルミニウム膜の膜厚の比率は、20%以上55%以下であることを特徴とする請求項2に記載の炭化珪素半導体装置の製造方法。
- 前記第1ニッケル膜の膜厚は、50nm以上120nm以下であり、
前記アルミニウム膜の膜厚は、25nm以上250nm以下であり、
前記第2ニッケル膜の膜厚は、50nm以上120nm以下であることを特徴とする請求項3に記載の炭化珪素半導体装置の製造方法。 - 前記アルミニウムよりも融点が高い金属膜は、チタン膜、モリブデン膜またはタングステン膜であることを特徴とする請求項1に記載の炭化珪素半導体装置の製造方法。
- 前記金属材料膜の膜厚に対する前記アルミニウム膜の膜厚の比率は、33%以上63%以下であることを特徴とする請求項5に記載の炭化珪素半導体装置の製造方法。
- 前記第1ニッケル膜の膜厚は、50nm以上120nm以下であり、
前記アルミニウム膜の膜厚は、25nm以上210nm以下であることを特徴とする請求項6に記載の炭化珪素半導体装置の製造方法。 - 前記第6工程では、前記第1熱処理の温度を500℃以上700℃以下とすることを特徴とする請求項1〜7のいずれか一つに記載の炭化珪素半導体装置の製造方法。
- 前記第8工程では、前記第2熱処理の温度を900℃以上1100℃以下とすることを特徴とする請求項1〜8のいずれか一つに記載の炭化珪素半導体装置の製造方法。
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