JP6863574B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP6863574B2 JP6863574B2 JP2017031525A JP2017031525A JP6863574B2 JP 6863574 B2 JP6863574 B2 JP 6863574B2 JP 2017031525 A JP2017031525 A JP 2017031525A JP 2017031525 A JP2017031525 A JP 2017031525A JP 6863574 B2 JP6863574 B2 JP 6863574B2
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- 239000004065 semiconductor Substances 0.000 title claims description 83
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 167
- 239000002184 metal Substances 0.000 claims description 167
- 239000000758 substrate Substances 0.000 claims description 91
- 238000007747 plating Methods 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 42
- 238000005219 brazing Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 32
- 238000005530 etching Methods 0.000 claims description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000010931 gold Substances 0.000 description 17
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 13
- 229920002120 photoresistant polymer Polymers 0.000 description 11
- 239000007789 gas Substances 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910002601 GaN Inorganic materials 0.000 description 4
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 238000009751 slip forming Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000007736 thin film deposition technique Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
(2)前記半導体基板を前記第1面から前記第1面とは反対側の第2面にかけて貫通するビアホールを形成する工程を有し、前記第1金属層、前記メッキ層および前記第2金属層は、前記ビアホールの内側から前記半導体基板の第1面にかけて形成され、前記第2金属層をエッチングする工程の後、前記ビアホールの内側において前記第2金属層が残存することが好ましい。第2金属層によりビアホール内へのロウ材の侵入を抑制し、クラックなどを抑制することができる。
(3)前記半導体基板を切断する工程の後、前記半導体基板の第1面の周縁部には前記第1金属層が残存することが好ましい。これにより第1金属層とロウ材とが接触するため、接合強度が高まる。
(4)前記第2金属層を形成する工程において、前記第2金属層は前記半導体基板の第1面全体を覆うように形成されることが好ましい。全体に形成された第2金属層をエッチングすることで、所望の位置に第2金属層を残存させることができる。
(5)前記第2金属層をエッチングする工程は、ヨウ素系エッチング液、アルゴンガスおよびフッ素系ガスの何れかを用いて実行されることが好ましい。これによりエッチング処理後に第1金属層が残存する。第1金属層がロウ材と接合することで、接合強度を高めることができる。
図1(a)は実施例1に係る半導体装置100を例示する平面図である。図1(a)に示すように、半導体装置100は、基板10、ゲートパッド12、ゲートフィンガー13、ソースパッド14、ソースフィンガー15、ドレインパッド16およびドレインフィンガー17を有する電界効果トランジスタ(FET:Field Effect Transistor)である。基板10は、炭化珪素(SiC)の絶縁基板11および半導体層19を含む半導体基板である。半導体層19には窒化ガリウム(GaN)のチャネル層、および窒化アルミニウムガリウム(AlGaN)の電子供給層などが形成されている。
図2(a)から図7(c)は半導体装置100の製造方法を例示する断面図である。図2(a)に示すように、例えば蒸着法およびリフトオフ法などにより、基板10の一方の面にソースパッド14を形成し、さらに図2(a)では不図示のゲートパッド、ドレインパッドおよびフィンガーなどを形成する。ワックス42を用いて、基板10をガラスの支持基板40に貼り付ける。基板10はウェハ状態である。図2(b)に示すように、上から絶縁基板11を研削し、厚さを例えば100μmとする。図2(c)に示すように、例えばスパッタリング法により、基板10の表面(第1面)から支持基板40の表面にかけて、例えばNi−Cr/Auの金属層44を形成する。
図8(a)および図8(b)は比較例に係る半導体装置100Rの製造方法を例示する断面図である。実施例1と同じ構成については説明を省略する。図8(a)に示すように、エッチング処理により、金属層24とともに金属層20も除去する。スクライブライン10b上に金属層20は残存しない。図8(b)に示すようにダイシング処理を行う。基板10の外周部には金属層20は残存せず、基板10の表面が露出する。
10a ビアホール
10b スクライブライン
11 絶縁基板
12 ゲートパッド
13 ゲートフィンガー
14 ソースパッド
15 ソースフィンガー
16 ドレインパッド
17 ドレインフィンガー
19 半導体層
20、24、44 金属層
22 メッキ層
30 実装基板
32 ロウ材
40 支持基板
42 ワックス
46、50、52 フォトレジスト
48 メタルマスク
54 テープ
100、100R 半導体装置
Claims (5)
- 半導体基板の第1面の全面にニッケルを含む第1金属層を形成する工程と、
前記第1金属層をシードメタルとしてメッキ処理を行うことで、前記半導体基板の前記第1面のうちスクライブライン以外の領域にメッキ層を形成する工程と、
前記半導体基板の前記第1面の全面に、前記第1金属層および前記メッキ層の表面にニッケルまたはチタンを含む第2金属層を形成する工程と、
前記半導体基板の前記第1面のうち、前記スクライブラインに前記第1金属層が残存し、前記スクライブライン以外の領域に前記第2金属層が残存するように、前記第2金属層をエッチングする工程と、
前記エッチングする工程の後に、前記スクライブラインに前記半導体基板および前記第1金属層が残存している状態において、前記スクライブラインにおける前記半導体基板および前記第1金属層を切断する工程と、
前記半導体基板および前記第1金属層を切断する工程で形成された半導体チップを、ロウ材を用いて実装基板に実装する工程と、を有し、
前記ロウ材は、前記半導体チップの前記第1面と前記実装基板との間に設けられる、半導体装置の製造方法。 - 前記半導体基板を前記第1面から前記第1面とは反対側の第2面にかけて貫通するビアホールを形成する工程を有し、
前記第1金属層、前記メッキ層および前記第2金属層は、前記ビアホールの内側から前記半導体基板の前記第1面にかけて形成され、
前記第2金属層をエッチングする工程の後、前記ビアホールの内側において前記第2金属層が残存する請求項1に記載の半導体装置の製造方法。 - 前記半導体基板を切断する工程の後、前記半導体基板の前記第1面の周縁部には前記第1金属層が残存する請求項1または2に記載の半導体装置の製造方法。
- 前記第2金属層を形成する工程において、前記第2金属層は前記半導体基板の前記第1面全体を覆うように形成される請求項1から3のいずれか一項に記載の半導体装置の製造方法。
- 前記切断する工程は、前記半導体基板の前記第1面とは反対側の第2面から前記第1面に向けて切断する工程である請求項1から4のいずれか一項に記載の半導体装置の製造方法。
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