JP6892538B1 - 半導体発光素子および半導体発光素子の製造方法 - Google Patents
半導体発光素子および半導体発光素子の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 241
- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 238000009792 diffusion process Methods 0.000 claims abstract description 245
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 20
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract 14
- 239000010410 layer Substances 0.000 claims description 671
- 239000011241 protective layer Substances 0.000 claims description 98
- 229910052751 metal Inorganic materials 0.000 claims description 83
- 239000002184 metal Substances 0.000 claims description 83
- 239000000463 material Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 32
- 238000000137 annealing Methods 0.000 claims description 16
- 230000007480 spreading Effects 0.000 claims description 7
- 238000003892 spreading Methods 0.000 claims description 7
- 239000003989 dielectric material Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910002704 AlGaN Inorganic materials 0.000 claims 4
- 230000007423 decrease Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 abstract description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 78
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 30
- 239000000758 substrate Substances 0.000 description 29
- 238000005530 etching Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 16
- 239000010936 titanium Substances 0.000 description 15
- 229910002601 GaN Inorganic materials 0.000 description 13
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 13
- 239000010931 gold Substances 0.000 description 11
- 239000000460 chlorine Substances 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 8
- 229910052801 chlorine Inorganic materials 0.000 description 8
- 239000007769 metal material Substances 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 238000001459 lithography Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010948 rhodium Substances 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- CRWSWMKELFKJMC-UHFFFAOYSA-N CC.F.F.F.F.F.F Chemical compound CC.F.F.F.F.F.F CRWSWMKELFKJMC-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910017855 NH 4 F Inorganic materials 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 1
- -1 and specifically Chemical compound 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- JVPLOXQKFGYFMN-UHFFFAOYSA-N gold tin Chemical compound [Sn].[Au] JVPLOXQKFGYFMN-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Abstract
Description
図1は、第1の実施の形態に係る半導体発光素子10の構成を概略的に示す断面図である。半導体発光素子10は、基板20と、ベース層22と、n型半導体層24と、活性層26と、p型半導体層28と、p側コンタクト電極30と、p側電流拡散層32と、n側コンタクト電極34と、n側電流拡散層36と、第1保護層38と、第2保護層40と、第3保護層42と、p側パッド電極44と、n側パッド電極46とを備える。
図14は、第2の実施の形態に係る半導体発光素子110の構成を概略的に示す断面図である。図14の半導体発光素子110は、p側コンタクト電極130、p側電流拡散層132、n側電流拡散層136、第1保護層138および第2保護層140の構成が上述の実施の形態と相違する。以下、本実施の形態について、上述した第1の実施の形態との相違点を中心に説明し、重複する説明は適宜省略する。
Claims (8)
- n型AlGaN系半導体材料から構成されるn型半導体層と、
前記n型半導体層の第1上面に設けられ、AlGaN系半導体材料から構成される活性層と、
前記活性層上に設けられるp型半導体層と、
前記p型半導体層の上面と接触して設けられるp側コンタクト電極と、
前記p側コンタクト電極上において前記p側コンタクト電極の形成領域よりも狭い領域内に設けられ、TiN層、金属層およびTiN層が順に積層される積層構造を有するp側電流拡散層と、
前記p側電流拡散層上に設けられるp側パッド電極と、
前記n型半導体層の第2上面と接触して設けられ、Al層を含むn側コンタクト電極と、
前記n側コンタクト電極上に設けられ、TiN層、金属層およびTiN層が順に積層される積層構造を有する第1電流拡散層と、前記第1電流拡散層上に設けられ、TiN層、金属層およびTiN層が順に積層される積層構造を有する第2電流拡散層とを含み、前記n側コンタクト電極の上面および側面の全体を被覆するように設けられるn側電流拡散層と、
前記n側電流拡散層上に設けられるn側パッド電極と、を備え、
前記n側電流拡散層に含まれる前記積層構造の数は、前記p側電流拡散層に含まれる前記積層構造の数よりも多いことを特徴とする半導体発光素子。 - 前記第1電流拡散層は、前記n側コンタクト電極の形成領域よりも広い領域にわたって設けられることを特徴とする請求項1に記載の半導体発光素子。
- 前記第2電流拡散層は、前記第1電流拡散層の形成領域よりも広い領域にわたって設けられることを特徴とする請求項1または2に記載の半導体発光素子。
- 前記積層構造の前記金属層の厚さは、前記積層構造の前記TiN層の厚さよりも大きいことを特徴とする請求項1から3のいずれか一項に記載の半導体発光素子。
- 前記活性層および前記p型半導体層の側面を被覆し、前記p型半導体層上のp側コンタクト開口とは異なる箇所において前記p型半導体層の上を被覆し、前記n型半導体層上のn側コンタクト開口とは異なる箇所において前記n型半導体層の前記第2上面を被覆し、誘電体材料から構成される保護層をさらに備え、
前記p側コンタクト電極は、前記p側コンタクト開口において前記p型半導体層の前記上面と接触し、前記保護層の上に重なるように設けられ、
前記p側電流拡散層は、前記保護層の上に重ならないように設けられ、
前記n側コンタクト電極は、前記n側コンタクト開口において前記n型半導体層の前記第2上面と接触し、前記保護層の上に重なるように設けられ、
前記n側電流拡散層は、前記保護層の上に重なるように設けられることを特徴とする請求項1から4のいずれか一項に記載の半導体発光素子。 - 前記活性層および前記p型半導体層の側面を被覆し、前記p側コンタクト電極上のp側コンタクト開口とは異なる箇所において前記p側コンタクト電極の上を被覆し、前記n型半導体層上のn側コンタクト開口とは異なる箇所において前記n型半導体層の前記第2上面を被覆し、誘電体材料から構成される保護層をさらに備え、
前記p側電流拡散層は、前記p側コンタクト開口において前記p側コンタクト電極の前記上面と接触し、前記保護層の上に重なるように設けられ、
前記n側コンタクト電極は、前記n側コンタクト開口において前記n型半導体層の前記第2上面と接触し、前記保護層の上に重なるように設けられ、
前記n側電流拡散層は、前記保護層の上に重なるように設けられることを特徴とする請求項1から5のいずれか一項に記載の半導体発光素子。 - n型AlGaN系半導体材料から構成されるn型半導体層上にAlGaN系半導体材料から構成される活性層を形成する工程と、
前記活性層上にp型半導体層を形成する工程と、
前記n型半導体層の一部領域の上面が露出するように、前記p型半導体層および前記活性層を部分的に除去する工程と、
前記p型半導体層の上面と接触するp側コンタクト電極を形成する工程と、
前記p側コンタクト電極上において前記p側コンタクト電極の形成領域よりも狭い領域内に、TiN層、金属層およびTiN層が順に積層される積層構造を有するp側電流拡散層を形成する工程と、
前記n型半導体層の前記露出する上面に接触し、Al層を含むn側コンタクト電極を形成する工程と、
前記n側コンタクト電極上に設けられ、TiN層、金属層およびTiN層が順に積層される積層構造を有する第1電流拡散層と、前記第1電流拡散層上に設けられ、TiN層、金属層およびTiN層が順に積層される積層構造を有する第2電流拡散層とを含み、前記n側コンタクト電極の上面および側面の全体を被覆するn側電流拡散層を形成する工程と、
前記p側電流拡散層上にp側パッド電極を形成する工程と、
前記n側電流拡散層上にn側パッド電極を形成する工程と、を備え、
前記n側電流拡散層に含まれる前記積層構造の数は、前記p側電流拡散層に含まれる前記積層構造の数よりも多いことを特徴とする半導体発光素子の製造方法。 - 前記n側コンタクト電極をアニールする工程をさらに備え、
前記n側電流拡散層は、前記n側コンタクト電極のアニール後に形成されることを特徴とする請求項7に記載の半導体発光素子の製造方法。
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