JP5023318B2 - 3−5族窒化物半導体積層基板、3−5族窒化物半導体自立基板の製造方法、及び半導体素子 - Google Patents
3−5族窒化物半導体積層基板、3−5族窒化物半導体自立基板の製造方法、及び半導体素子 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 265
- 150000004767 nitrides Chemical class 0.000 title claims description 187
- 239000000758 substrate Substances 0.000 title claims description 166
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000013078 crystal Substances 0.000 claims description 103
- 239000000463 material Substances 0.000 claims description 23
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 238000005530 etching Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 51
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 32
- 229910052594 sapphire Inorganic materials 0.000 description 28
- 239000010980 sapphire Substances 0.000 description 28
- 239000007789 gas Substances 0.000 description 20
- 239000002994 raw material Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 229910004298 SiO 2 Inorganic materials 0.000 description 16
- 229910021529 ammonia Inorganic materials 0.000 description 16
- 230000035882 stress Effects 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000011777 magnesium Substances 0.000 description 13
- 239000011575 calcium Substances 0.000 description 12
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 10
- 239000012159 carrier gas Substances 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 239000010408 film Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000001878 scanning electron micrograph Methods 0.000 description 9
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 9
- 240000004050 Pentaglottis sempervirens Species 0.000 description 8
- 235000004522 Pentaglottis sempervirens Nutrition 0.000 description 8
- 125000000217 alkyl group Chemical group 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 238000002248 hydride vapour-phase epitaxy Methods 0.000 description 8
- 229910052738 indium Inorganic materials 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 229910002704 AlGaN Inorganic materials 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 239000001307 helium Substances 0.000 description 6
- 229910052734 helium Inorganic materials 0.000 description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002019 doping agent Substances 0.000 description 5
- 230000006355 external stress Effects 0.000 description 5
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 5
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 5
- RHUYHJGZWVXEHW-UHFFFAOYSA-N 1,1-Dimethyhydrazine Chemical compound CN(C)N RHUYHJGZWVXEHW-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052733 gallium Inorganic materials 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 238000001451 molecular beam epitaxy Methods 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 4
- RGGPNXQUMRMPRA-UHFFFAOYSA-N triethylgallium Chemical compound CC[Ga](CC)CC RGGPNXQUMRMPRA-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
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- 239000011800 void material Substances 0.000 description 3
- DIIIISSCIXVANO-UHFFFAOYSA-N 1,2-Dimethylhydrazine Chemical compound CNNC DIIIISSCIXVANO-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910021617 Indium monochloride Inorganic materials 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- PNZJBDPBPVHSKL-UHFFFAOYSA-M chloro(diethyl)indigane Chemical compound [Cl-].CC[In+]CC PNZJBDPBPVHSKL-UHFFFAOYSA-M 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- -1 indium halide Chemical class 0.000 description 2
- APHGZSBLRQFRCA-UHFFFAOYSA-M indium(1+);chloride Chemical compound [In]Cl APHGZSBLRQFRCA-UHFFFAOYSA-M 0.000 description 2
- PSCMQHVBLHHWTO-UHFFFAOYSA-K indium(iii) chloride Chemical compound Cl[In](Cl)Cl PSCMQHVBLHHWTO-UHFFFAOYSA-K 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- HDZGCSFEDULWCS-UHFFFAOYSA-N monomethylhydrazine Chemical compound CNN HDZGCSFEDULWCS-UHFFFAOYSA-N 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 125000002524 organometallic group Chemical group 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- YBRBMKDOPFTVDT-UHFFFAOYSA-N tert-butylamine Chemical compound CC(C)(C)N YBRBMKDOPFTVDT-UHFFFAOYSA-N 0.000 description 2
- OTRPZROOJRIMKW-UHFFFAOYSA-N triethylindigane Chemical compound CC[In](CC)CC OTRPZROOJRIMKW-UHFFFAOYSA-N 0.000 description 2
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- NWSBZZUWLKYOBO-UHFFFAOYSA-N C1(C=CC=C1)[Ca] Chemical compound C1(C=CC=C1)[Ca] NWSBZZUWLKYOBO-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- LZNROSKSIPUXML-UHFFFAOYSA-N [Ca](c1cccc2ccccc12)c1cccc2ccccc12 Chemical compound [Ca](c1cccc2ccccc12)c1cccc2ccccc12 LZNROSKSIPUXML-UHFFFAOYSA-N 0.000 description 1
- 229910000086 alane Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- UIXRSLJINYRGFQ-UHFFFAOYSA-N calcium carbide Chemical compound [Ca+2].[C-]#[C-] UIXRSLJINYRGFQ-UHFFFAOYSA-N 0.000 description 1
- 238000005136 cathodoluminescence Methods 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002109 crystal growth method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- UPWPDUACHOATKO-UHFFFAOYSA-K gallium trichloride Chemical compound Cl[Ga](Cl)Cl UPWPDUACHOATKO-UHFFFAOYSA-K 0.000 description 1
- 229910000078 germane Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- ZRLCXMPFXYVHGS-UHFFFAOYSA-N tetramethylgermane Chemical compound C[Ge](C)(C)C ZRLCXMPFXYVHGS-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0062—Processes for devices with an active region comprising only III-V compounds
- H01L33/0066—Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound
- H01L33/007—Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound comprising nitride compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/0242—Crystalline insulating materials
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02455—Group 13/15 materials
- H01L21/02458—Nitrides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/0254—Nitrides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
-
- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02636—Selective deposition, e.g. simultaneous growth of mono- and non-monocrystalline semiconductor materials
- H01L21/02639—Preparation of substrate for selective deposition
- H01L21/02642—Mask materials other than SiO2 or SiN
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2304/00—Special growth methods for semiconductor lasers
- H01S2304/12—Pendeo epitaxial lateral overgrowth [ELOG], e.g. for growing GaN based blue laser diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
- H01S5/323—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/32308—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm
- H01S5/32341—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm blue laser based on GaN or GaP
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Description
れる。
以下のようにして、図1に示す3−5族窒化物半導体積層基板1を作成した。下地基板11はサファイアのC面を鏡面研磨したものを用いた。エピタキシャル成長には常圧MOVPE法を用いた。1気圧で、サセプタの温度を485℃、キャリアガスを水素とし、キャリアガス、アンモニア及びTMGを供給して、厚みが約60nmのGaNバッファ層(低結晶性半導体層12)を成長した。
実施例1においてSiO2 ストライプを(ストライプ幅7μm/ストライプ間隔3μmストライプはサファイア基板の〈1−100〉方向と平行)とした以外は実施例1と同様の操作を行い、サファイア基板上にGaN層を35μmまで成長させて3−5族窒化物半導体結晶14とした。
実施例1においてSiO2 ストライプを(ストライプ幅3μm/ストライプ間隔7μmストライプはサファイア基板の〈1−100〉方向と平行)とした以外は実施例1と同様の操作を行い、サファイア基板上にGaN層を35μmまで成長させて3−5族窒化物半導体結晶14とした。
実施例1においてSiO2 ストライプを形成しない以外は実施例1と同様の操作を行い、GaN層を35μm形成して3−5族窒化物半導体結晶14とした。GaN層のサファイア基板からの剥離は観察されなかった。この時のX線回析から求められる(0004)の半値幅はX線の入射方向に関係なく360arcsecであった。
実施例1〜3、及び比較例1の試料を励起ピーク波長364nmとして、GaN結晶表面カソードルミネッセンス(以下CLと略記する)で非発光箇所を観察した。非発光箇所はダークスポットと呼び、転位に対応していると考えられるため、非発光箇所の個数から転位密度を計算した。その結果を纏めれば、以下の通りである。
ストライプ幅/間隔 転位密度
実施例1 5μm/5μm 5〜8×107 cm-2
実施例2 7μm/3μm 5〜8×107 cm-2
実施例3 3μm/7μm 4×108 cm-2
比較例1 なし >1×109 cm-2
実施例1と同様にサファイア上にGaN層を35μmまで成長させた。このときGaN層の電子輸送性を付与するため、シランをドープし、35μmのSiドープGaN層とした。これらの層の上に以下の方法で青色LED用の発光層37を積層した。まず、反応炉温度を下げて780℃とし、窒素をキャリアガスとしてGaN、(InGaN、GaN)×5を成長後、Al組成0.05のMgドープAlGaN層を25nm成長した。次に反応炉温度を1040℃に上げ、キャリアガス、アンモニア、TMG、Cp2 Mgを導入して、成長時間30分で厚さが150nmのMgをドープしたGaNを形成した。その後反応炉温度を室温まで冷却して反応炉から取り出した。これにより、成長基板との界面で剥離が生じ、成長基板から独立した窒化物半導体基板を得た。
バッファ層成長、SiO2 ストライプを形成し、1020℃75分間アンドープGaN層の成長までは実施例1と同様な操作を行い、アンドープGaN層を形成した。冷却後、断面の走査型電子顕微鏡(SEM)で観察を行った。図4に示す通り、マスク下の低温バッファ層には多くの空隙が形成されていた。また、図5の鳥瞰SEM像に示す通り、側面に[11−2 2]ファセット面を持つGaNが形成されていた。
参考例1のGaN結晶成長に引き続いて、実施例1と同様に1120℃で90分間アンドープGaN層の成長までは実施例1と同様な操作を行い、アンドープGaN層を形成した。冷却後、GaN結晶の鳥瞰SEM像を観察した。図6に示す通り、表面は全面で平坦な膜が得られた。
参考例2の成長温度を1100℃にする以外は参考例2と同様な操作を行い、アンドープGaN層を形成した。冷却後、GaN結晶の鳥瞰SEM像を観察した。図7に示す通り、表面は埋めこまれなかった。
参考例2の成長温度を1140℃にする以外は参考例2と同様な操作を行い、アンドープGaN層を形成した。冷却後、GaN結晶の鳥瞰SEM像を観察した。図8に示す通り、表面は全面で平坦な膜が得られた。
下地基板に予め2段階成長によりサファイア基板上にGaN層を2μm積層し、その表面にSiO2 ストライプ(ストライプ幅5μm/ストライプ間隔5μm、ストライプはサファイア基板の〈1−100〉方向と平行)を形成し、反応炉でGaN結晶を最終的に35μm成長して3−5族窒化物半導体結晶14を形成した。冷却後反応炉から取り出したが、該GaN層は、サファイア基板から剥離しなかった。
11 下地基板
12 半導体層
12A 空隙
13 マスク
14 3−5族窒化物半導体結晶
15 発光素子機能を有する半導体層
16、17 電極
18 支持基板
19 3−5族窒化物半導体自立基板
20 半導体発光素子用パッケージ
21 窒化物半導体基板
Claims (2)
- 下地基板上に3−5族窒化物半導体結晶を選択成長させて3−5族窒化物半導体自立基板を製造するための方法であって、
前記下地基板の上に400℃〜700℃で成長されてなるInxGayAlzN(ただし、0≦x≦1、0≦y≦1、0≦z≦1、x+y+z=1)で、前記3−5族窒化物半導体結晶より結晶性の低い半導体バッファ層を形成する工程と、
該半導体バッファ層上にSiO2、Si、およびSiの窒化物よりなるストライプ状、ドット状のマスクを形成する工程と、
選択成長によって前記3−5族窒化物半導体結晶を成長すると同時に、該半導体バッファ層に空隙を設ける工程と、
前記半導体層において前記3−5族窒化物半導体結晶と前記下地基板とを、応力を加えて機械的に剥離する分離工程又は、雰囲気温度を降下させることによって前記下地基板を剥離する分離工程、
とからなることを特徴とする3−5族窒化物半導体自立基板の製造方法。 - 前記分離工程が、前記剥離する工程に加え、前記マスク材料および又は前記半導体層を化学的にエッチングする工程を含む請求項1に記載の3−5族窒化物半導体自立基板の製造方法。
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PCT/JP2006/309166 WO2006123540A1 (ja) | 2005-05-19 | 2006-05-02 | 3-5族窒化物半導体積層基板、3-5族窒化物半導体自立基板の製造方法、及び半導体素子 |
DE112006001279T DE112006001279T5 (de) | 2005-05-19 | 2006-05-02 | Mehrschichtensubstrat eines Nitridhalbleiters der Gruppe 3-5, Verfahren zur Herstellung eines freitragenden Substrats eines Nitridhalbleiters der Gruppe 3-5 und Halbleiterelement |
US11/920,563 US8053811B2 (en) | 2005-05-19 | 2006-05-02 | Group 3-5 nitride semiconductor multilayer substrate, method for manufacturing group 3-5 nitride semiconductor free-standing subtrate, and semiconductor element |
KR1020077027108A KR20080003913A (ko) | 2005-05-19 | 2006-05-02 | 3-5족 질화물 반도체 적층 기판, 3-5족 질화물 반도체 자립기판의 제조 방법 및 반도체 소자 |
TW095116014A TW200644299A (en) | 2005-05-19 | 2006-05-05 | Group III-V nitride semiconductor laminated substrate, method of producing the same and semiconductor device |
GB0722572A GB2440484A (en) | 2005-05-19 | 2007-11-16 | Group 3-5 nitride semiconductor multilayer substrate, method for manufacturing group 3-5 nitride semiconductor free-standing substrate |
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GB2440484A8 (en) | 2008-02-29 |
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