JP2020057640A - 発光装置およびプロジェクター - Google Patents
発光装置およびプロジェクター Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 claims abstract description 114
- 238000003475 lamination Methods 0.000 claims abstract description 4
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 25
- 229910052738 indium Inorganic materials 0.000 claims description 25
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 25
- 229910002601 GaN Inorganic materials 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 abstract 2
- 230000004888 barrier function Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 18
- 239000013078 crystal Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000007547 defect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000002070 nanowire Substances 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052733 gallium Inorganic materials 0.000 description 5
- 238000001451 molecular beam epitaxy Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004038 photonic crystal Substances 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 230000006798 recombination Effects 0.000 description 3
- 238000005215 recombination Methods 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002061 nanopillar Substances 0.000 description 2
- 239000002073 nanorod Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
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- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
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- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34333—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser
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- 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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- H01S5/3408—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers characterised by specially shaped wells, e.g. triangular
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Abstract
Description
基体と、
前記基体に設けられ、複数の柱状部を有する積層体と、
を有し、
前記柱状部は、
第1半導体層と、
前記第1半導体層と導電型の異なる第2半導体層と、
前記第1半導体層と前記第2半導体層との間に設けられている発光層と、
を有し、
前記第1半導体層は、ファセット面と、c面と、m面と、を有し、
前記発光層は、
前記ファセット面に設けられているファセット面領域と、
前記c面に設けられているc面領域と、
を有し、
前記発光層は、前記m面に設けられている領域を有しておらず、
前記積層体の積層方向から見た平面視において、前記c面領域は、前記ファセット面領域よりも大きい。
前記発光層は、窒化インジウムガリウムを含み、
前記c面領域のインジウムの濃度は、前記ファセット面領域のインジウムの濃度よりも高くてもよい。
前記ファセット面領域の膜厚は、前記c面領域の膜厚よりも小さくてもよい。
前記発光装置の一態様を有する。
1.1. 発光装置
まず、第1実施形態に係る発光装置について、図面を参照しながら説明する。図1は、第1実施形態に係る発光装置100を模式的に示す断面図である。
むp型の半導体層である。第2半導体層36は、例えば、マグネシウム(Mg)がドープされたp型のGaN層である。第1半導体層32および第2半導体層36は、SQW層34に光を閉じ込める機能を有するクラッド層である。
導体層32は、図2に示すように、ファセット面2と、c面4と、m面6と、を有している。c面4は、例えば、図1に示す基体10の主面11に対して平行な面である。ファセット面2は、例えば、基体10の主面11に対して傾斜している面である。すなわち、ファセット面2は、c面4に対して傾斜している。m面6は、基体10の主面11に対して垂直な面である。すなわち、m面6は、c面4に対して垂直である。c面4は、(0001)面であり、ファセット面2は、例えば、{1−101}面、{11−22}面などであり、m面6は、例えば、{10−10}面である。
0aのインジウムの濃度よりも高い。ここで、柱状部30間を伝搬する光の伝搬方向は、c面の面内方向である。また、発光層340のインジウムの濃度が高いほど、発光層340に光を閉じ込めることができる。したがって、発光装置100では、柱状部30間を伝搬する光を、発光層340に効率よく閉じ込めることができる。
次に、発光装置100の製造方法について、図面を参照しながら説明する。図4および図5は、発光装置100の製造工程を模式的に示す断面図である。
際に、InGaN層が第1半導体層32のm面6に設けられる場合がある。第1半導体層32のm面6に設けられたInGaN層は、第1半導体層32および第2半導体層36に挟まれていないため、発光層340とはいえない。第1半導体層32のm面6に設けられたInGaN層の膜厚は、例えば、c面領域340bの膜厚よりも小さい。これにより、InGaN層に生じる結晶欠陥を減少させることができる。m面6に設けられるInGaN層の膜厚は、例えば、5nm以下である。
2.1. 発光装置
次に、第2実施形態に係る発光装置について、図面を参照しながら説明する。図6は、第2実施形態に係る発光装置200を模式的に示す断面図である。図7は、発光装置200の、第1半導体層32、MQW(multi quantum well)層35、および第2半導体層36を模式的に示す断面図である。
発光装置200の製造方法は、SQW層34に変えてMQW層35を形成する点を除いて、上述した発光装置100の製造方法と同じであり、その説明を省略する。
次に、第3実施形態に係るプロジェクターについて、図面を参照しながら説明する。図
8は、第3実施形態に係るプロジェクター1000を模式的に示す図である。
on Silicon)プロジェクターであってもよい。
次に、第4実施形態に係るプロジェクターについて、図面を参照しながら説明する。図9は、第4実施形態に係るプロジェクター2000を模式的に示す図である。図10は、第4実施形態に係るプロジェクター2000の光変調素子120を模式的に示す断面図である。
。ヨーク238は、剛性のある膜である。ヨーク238に、支柱240を介して、ミラー242が設けられている。ミラー242およびヨーク238は、ヒンジによって、傾斜可能に設けられている。
Claims (4)
- 基体と、
前記基体に設けられ、複数の柱状部を有する積層体と、
を有し、
前記柱状部は、
第1半導体層と、
前記第1半導体層と導電型の異なる第2半導体層と、
前記第1半導体層と前記第2半導体層との間に設けられている発光層と、
を有し、
前記第1半導体層は、ファセット面と、c面と、m面と、を有し、
前記発光層は、
前記ファセット面に設けられているファセット面領域と、
前記c面に設けられているc面領域と、
を有し、
前記発光層は、前記m面に設けられている領域を有しておらず、
前記積層体の積層方向から見た平面視において、前記c面領域は、前記ファセット面領域よりも大きい、発光装置。 - 請求項1において、
前記発光層は、窒化インジウムガリウムを含み、
前記c面領域のインジウムの濃度は、前記ファセット面領域のインジウムの濃度よりも高い、発光装置。 - 請求項1または2において、
前記ファセット面領域の膜厚は、前記c面領域の膜厚よりも小さい、発光装置。 - 請求項1ないし3のいずれか1項に記載の発光装置を有する、プロジェクター。
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