WO2010131526A1 - 窒化物半導体発光素子 - Google Patents
窒化物半導体発光素子 Download PDFInfo
- Publication number
- WO2010131526A1 WO2010131526A1 PCT/JP2010/055589 JP2010055589W WO2010131526A1 WO 2010131526 A1 WO2010131526 A1 WO 2010131526A1 JP 2010055589 W JP2010055589 W JP 2010055589W WO 2010131526 A1 WO2010131526 A1 WO 2010131526A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- cladding
- region
- cladding layer
- inalgan
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 242
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 96
- 238000005253 cladding Methods 0.000 claims abstract description 465
- 229910002704 AlGaN Inorganic materials 0.000 claims abstract description 165
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 95
- 229910002601 GaN Inorganic materials 0.000 claims description 79
- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 38
- 239000000758 substrate Substances 0.000 abstract description 27
- 239000010410 layer Substances 0.000 description 446
- 230000012010 growth Effects 0.000 description 23
- 230000004888 barrier function Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013507 mapping Methods 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- QBJCZLXULXFYCK-UHFFFAOYSA-N magnesium;cyclopenta-1,3-diene Chemical compound [Mg+2].C1C=CC=[C-]1.C1C=CC=[C-]1 QBJCZLXULXFYCK-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01S5/34—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
-
- 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
- H01L33/02—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 characterised by the semiconductor bodies
- H01L33/16—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 characterised by the semiconductor bodies with a particular crystal structure or orientation, e.g. polycrystalline, amorphous or porous
-
- 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
- H01L33/02—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 characterised by the semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/30—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table
- H01L33/32—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table containing nitrogen
-
- 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
- H01S5/3202—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures grown on specifically orientated substrates, or using orientation dependent growth
- H01S5/320275—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures grown on specifically orientated substrates, or using orientation dependent growth semi-polar orientation
-
- 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
- H01S5/3201—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures incorporating bulkstrain effects, e.g. strain compensation, strain related to polarisation
-
- 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
- H01S5/3211—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures characterised by special cladding layers, e.g. details on band-discontinuities
Definitions
- the present invention relates to a nitride semiconductor light emitting device.
- Patent Document 1 describes an ultraviolet light emitting element.
- the ultraviolet light emitting element emits light with high efficiency at room temperature in a short wavelength region of an ultraviolet region having a wavelength of 360 nm or less.
- This ultraviolet light emitting element has a quantum well structure including an In 0.37 Al 0.02 Ga 0.61 N layer and an In 0.16 Al 0.06 Ga 0.78 N layer that form alternating junctions on a SiC substrate. This quantum well structure is formed directly on the Al 0.40 Ga 0.60 N layer.
- the InAlGaN layer serves as a buffer layer and has the same composition as the barrier layer.
- This InAlGaN buffer layer is grown thick as an extension of the barrier layer. Moreover, it has the same composition as the InAlGaN barrier layer formed between the well layers in the quantum well structure, and the InAlGaN layer is also different from the cladding layer in this respect.
- GaN gallium nitride
- a slip surface for example, c-plane slip surface
- AlGaN having a higher Al composition can be grown on the semipolar gallium nitride substrate as compared with the c-plane GaN substrate.
- misfit dislocations are introduced instead of cracks to release the strain.
- the core semiconductor region sandwiched between the p-type and n-type cladding layers may be lattice-relaxed with respect to the cladding layer.
- misfit dislocations are introduced at the interface between the cladding layer and the core semiconductor region.
- the clad layer is provided for light confinement, and the amplitude of light is reduced in the clad layer.
- misfit dislocations due to the difference between the lattice constant of the cladding layer and the lattice constant of the core semiconductor region are formed at the interface, the misfit dislocations cause optical loss due to light scattering.
- An object of the present invention is to provide a nitride semiconductor light emitting device capable of improving light confinement in a light emitting device formed on a nonpolar plane and reducing optical loss due to dislocation.
- a nitride semiconductor light emitting device includes: (a) a support base made of a hexagonal gallium nitride semiconductor; (b) a first cladding region made of a first conductivity type gallium nitride semiconductor; ) A second cladding region made of a second conductivity type gallium nitride based semiconductor; and (d) a core semiconductor region including an active layer and a carrier block layer.
- the c-axis of the hexagonal gallium nitride semiconductor faces a direction different from the normal axis of the main surface of the support base and is a plane defined by the c-axis of the hexagonal gallium nitride semiconductor and the normal axis of the support base.
- the core semiconductor region is provided between the first cladding region and the second cladding region, the core semiconductor region, the first cladding region, and the second cladding.
- the region is mounted on the main surface of the support base, and the first cladding region includes an AlGaN cladding layer and an InAlGaN cladding layer, and the InAlGaN cladding layer is interposed between the AlGaN cladding layer and the active layer. And the InAlGaN cladding layer is bonded to the core semiconductor region.
- the Al composition is increased in order to improve the optical confinement property of the AlGaN layer and / or It becomes possible to increase the thickness of the AlGaN layer.
- the cladding region composed of the AlGaN cladding layer and the InAlGaN cladding layer has a lattice constant that can provide a good junction with the core semiconductor region and a refractive index necessary for the cladding. Can provide both.
- the first cladding region includes an interface between the AlGaN cladding layer and the InAlGaN cladding layer, and a misfit dislocation density at the interface between the InAlGaN cladding layer and the AlGaN cladding layer is It is larger than the misfit dislocation density at the interface between the core semiconductor region and the first cladding region.
- the misfit dislocation density at the interface between the InAlGaN cladding layer and the AlGaN cladding layer is larger than the misfit dislocation density at the interface between the core semiconductor region and the first cladding region.
- the interface between the core semiconductor region and the first cladding region is separated from the interface with a large misfit dislocation density by the InAlGaN layer.
- the misfit dislocation density at the interface between the InAlGaN cladding layer and the AlGaN cladding layer is preferably 1 ⁇ 10 4 cm ⁇ 1 or more in the first cladding region. According to this nitride semiconductor light emitting device, when dislocations having this dislocation density are introduced into the interface, lattice relaxation occurs in one semiconductor layer related to the interface.
- An AlGaN clad layer having an Al composition and a film thickness enough to relax the lattice can improve optical confinement.
- the misfit dislocation density at the interface between the core semiconductor region and the first cladding region is preferably less than 1 ⁇ 10 4 cm ⁇ 1 . According to this nitride semiconductor light emitting device, optical loss due to light scattering due to misfit dislocations can be reduced.
- the core semiconductor region composed of a stack of relatively thin semiconductor layers is composed of a coherently grown semiconductor layer.
- the Al composition of the AlGaN cladding layer is preferably 0.05 or more in the first cladding region.
- the Al composition of the AlGaN cladding layer is preferably 0.2 or less.
- the AlGaN cladding layer can be relaxed relative to the InAlGaN cladding layer.
- the Al composition is too large, there is a high possibility that the crystal quality of the AlGaN cladding layer is deteriorated and the AlGaN cladding layer is relaxed in the direction perpendicular to the c-axis off direction.
- the thickness of the InAlGaN cladding layer is preferably smaller than the thickness of the AlGaN cladding layer. According to this nitride semiconductor light emitting device, the light confinement property by the AlGaN cladding layer can be utilized. A decrease in throughput due to the growth of thick InAlGaN can be avoided.
- the band gap of the InAlGaN cladding layer is preferably equal to or less than the band gap of the AlGaN cladding layer in the first cladding region. According to this nitride semiconductor light emitting device, the lattice-relaxed AlGaN cladding layer can provide a large band gap that cannot be practically used in the quaternary InAlGaN cladding layer.
- the thickness of the InAlGaN cladding layer is preferably 0.05 ⁇ m or more in the first cladding region. According to this nitride semiconductor light emitting device, an InAlGaN cladding layer that is too thin cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer from the core semiconductor region, and at this time, optical loss occurs at this interface.
- the thickness of the InAlGaN cladding layer is preferably 0.3 ⁇ m or less. According to this nitride semiconductor light emitting device, too thick InAlGaN contributes less to the light confinement by the AlGaN cladding layer.
- the band gap of the InAlGaN cladding layer is preferably equal to or greater than the band gap of the AlGaN cladding layer in the first cladding region.
- the desired optical confinement property can be obtained as the entire cladding region.
- the thickness of the InAlGaN cladding layer is preferably 0.05 ⁇ m or more in the first cladding region. According to this nitride semiconductor light emitting device, the thin InAlGaN layer cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer from the core semiconductor region, and at this time, optical loss occurs at this interface.
- the thickness of the InAlGaN cladding layer is preferably 1.0 ⁇ m or less. According to this nitride semiconductor light emitting device, the upper limit of the film thickness of 1.0 ⁇ m is practical even for InAlGaN in which the growth rate cannot be increased.
- the core semiconductor region includes a first light guide layer, the first light guide layer forms a junction with the InAlGaN cladding layer in the first cladding region, and
- the lattice constant specific to InAlGaN in the InAlGaN cladding layer in the cladding region is less than or equal to the lattice constant specific to the gallium nitride-based semiconductor in the first light guide layer in the core semiconductor region, and the InAlGaN cladding layer in the first cladding region.
- the lattice constant is preferably larger than the lattice constant of the AlGaN cladding layer in the first cladding region.
- the lattice constant of the InAlGaN cladding layer is larger than the lattice constant of the AlGaN cladding layer and is not more than the lattice constant inherent to the first light guide layer.
- the InAlGaN cladding layer is preferably lattice-matched to the first light guide layer with respect to a projection direction of the c-axis onto the main surface.
- the first light guide layer is coherently grown on the InAlGaN cladding layer.
- the core semiconductor region is coherently grown on the InAlGaN cladding layer.
- the first cladding region has n-type conductivity, and the misfit dislocation density at the interface between the AlGaN cladding layer and the support substrate in the first cladding region is the core.
- the misfit dislocation density at the interface between the semiconductor region and the first cladding region is preferably larger.
- the light confinement property in the n-side semiconductor region can be improved.
- the AlGaN cladding layer in the first cladding region is lattice-relaxed on the support base. Therefore, the optical confinement of the first cladding region can be improved by increasing the Al composition of the AlGaN cladding layer and / or increasing the thickness of the AlGaN cladding layer.
- a misfit dislocation density at the interface between the AlGaN cladding layer and the support base in the first cladding region is preferably 1 ⁇ 10 4 cm ⁇ 1 or more. According to this nitride semiconductor light emitting device, the AlGaN cladding corresponding to this dislocation density can achieve good optical confinement.
- the first cladding region has p-type conductivity
- the nitride semiconductor light emitting device further includes a p-type contact layer provided on the first cladding region.
- the core semiconductor region includes a second light guide layer and an electron block layer, the second light guide layer is provided between the electron block layer and the first cladding region, and the electron block layer is the second light guide layer. It can be provided between the light guide layer and the active layer.
- the light confinement property in the p-side semiconductor region can be improved.
- a p-type contact layer is provided on the lattice-relaxed AlGaN cladding layer, and the lattice relaxation of the AlGaN cladding layer does not affect the p-type contact layer.
- the first cladding region has n-type conductivity
- the second cladding region has p-type conductivity
- the second cladding region has an AlGaN cladding layer and An InAlGaN cladding layer
- the InAlGaN cladding layer in the second cladding region is provided between the AlGaN cladding layer and the active layer in the second cladding region
- the InAlGaN cladding layer in the second cladding region is A junction is formed in the core semiconductor region
- a lattice constant of the InAlGaN cladding layer in the second cladding region is preferably larger than a lattice constant of the AlGaN cladding layer in the second cladding region.
- nitride semiconductor light emitting device According to this nitride semiconductor light emitting device, light confinement in the p-side semiconductor region and the n-side semiconductor region can be improved.
- the misfit dislocation density at the interface between the AlGaN cladding layer and the InAlGaN cladding layer in the second cladding region is a misalignment at the interface between the core semiconductor region and the second cladding region. It should be larger than the fit dislocation density.
- the p-type AlGaN layer and the n-type InAlGaN layer included in the p-side semiconductor region and the n-side semiconductor region, respectively, are lattice-relaxed.
- a misfit dislocation density at an interface between the AlGaN cladding layer and the InAlGaN cladding layer in the second cladding region may be 1 ⁇ 10 4 cm ⁇ 1 or more.
- the nitride semiconductor light emitting device when dislocations having this dislocation density are introduced into the interface, lattice relaxation occurs in one semiconductor layer related to the interface. This lattice relaxation can improve the optical confinement by the AlGaN cladding layer.
- the angle formed between the c-axis of the hexagonal gallium nitride semiconductor and the normal axis of the support base is preferably 10 degrees or more.
- the angle is preferably 170 degrees or less. According to the nitride semiconductor light emitting device, good light confinement can be obtained by utilizing generation of a slip surface in nonpolar (semipolar and nonpolar).
- the angle is preferably 10 degrees to 80 degrees or 100 degrees to 170 degrees. According to this nitride semiconductor light emitting device, it is possible to obtain a good light confinement property by utilizing generation of a slip surface in semipolarity.
- the angle is preferably 63 degrees or more and 80 degrees or less, or 100 degrees or more and 117 degrees or less.
- this nitride semiconductor light emitting device in this angular range, dislocations can be easily generated by introducing a slip surface, and the degree of freedom in device design is high.
- the semipolar plane in this angular range tends to be excellent in In incorporation.
- nitride semiconductor light emitting device capable of improving light confinement in a light emitting device formed on a nonpolar plane and reducing optical loss due to dislocation.
- FIG. 1 is a drawing schematically showing a nitride semiconductor light emitting device according to the present embodiment.
- FIG. 2 is a drawing showing the relationship between the semiconductor layer constituting the epitaxial substrate E1 of the nitride semiconductor light emitting device shown in FIG. 1 and its lattice constant.
- FIG. 3 shows the energy level of the conduction band in the cladding region.
- FIG. 4 is a drawing showing the energy level of the conduction band in the cladding region.
- FIG. 5 is a drawing showing main steps in a method of manufacturing a nitride laser diode.
- FIG. 6 is a drawing showing major steps in a method for fabricating a nitride laser diode.
- FIG. 1 is a drawing schematically showing a nitride semiconductor light emitting device according to the present embodiment.
- FIG. 2 is a drawing showing the relationship between the semiconductor layer constituting the epitaxial substrate E1 of the nitride semiconductor light emitting device shown in
- FIG. 7 is a drawing showing structures of nitride laser diodes in Examples and Comparative Examples.
- FIG. 8 is a drawing showing structures of nitride laser diodes in Examples and Comparative Examples.
- FIG. 9 shows an epitaxial substrate for measuring reciprocal lattice mapping.
- FIG. 10 is a drawing showing a reciprocal lattice mapping image of (20-24) in an epitaxial substrate.
- FIG. 1 is a drawing schematically showing a nitride semiconductor light emitting device according to the present embodiment.
- FIG. 2 is a drawing showing the relationship between the semiconductor layer constituting the epitaxial substrate E1 of the nitride semiconductor light emitting device shown in FIG. 1 and its lattice constant.
- the nitride semiconductor light emitting device 11 includes a support base 13, a core semiconductor region 15, a first cladding region 17, and a second cladding region 19.
- the support base 13 is made of a hexagonal gallium nitride (GaN) semiconductor.
- the c-axis (indicated by a vector VC) Cx of the hexagonal gallium nitride semiconductor is inclined in a predetermined direction (for example, the X-axis direction) with respect to the normal axis Nx of the main surface 13a of the support base 13.
- the predetermined direction can be the a-axis or m-axis of a hexagonal gallium nitride semiconductor.
- the main surface 13a can have non-polarity (semipolar or nonpolar) and is parallel to a plane defined by the X axis and the Y axis.
- the c-axis Cx of the hexagonal gallium nitride semiconductor is oriented in a direction different from the normal axis Nx of the main surface 13 a of the support base 13.
- a plane defined by the normal axis Nx and the c-axis Cx of the support base 13 extends in a predetermined direction.
- the first cladding region 17 is made of a first conductivity type (eg, n-type) gallium nitride semiconductor.
- the second cladding region 19 is made of a second conductivity type (for example, p-type) gallium nitride semiconductor.
- the core semiconductor region 15 includes an active layer 21 and a carrier block layer 23.
- the core semiconductor region 15 is provided between the first cladding region 17 and the second cladding region 19.
- the core semiconductor region 15, the first cladding region 17 and the second cladding region 19 are mounted on the main surface 13 a of the support base 13.
- both the first cladding region 17 and the second cladding region 19 have a two-layer cladding structure, either the first cladding region 17 or the second cladding region 19 has the above-described cladding structure. Can have.
- the first cladding region 17 includes an n-type AlGaN cladding layer 25 and an n-type InAlGaN cladding layer 26.
- the n-type InAlGaN cladding layer 26 is provided between the n-type AlGaN cladding layer 25 and the active layer 21.
- the n-type InAlGaN cladding layer 26 forms a junction 27 a with the core semiconductor region 15.
- the Al composition is increased in order to improve the light confinement property of the AlGaN layer 25.
- the cladding region 17 composed of the AlGaN cladding layer 25 and the InAlGaN cladding layer 26 is a lattice that forms a good junction 27a with the refractive index necessary for the cladding and the core semiconductor region 15. Both constants can be provided.
- the first cladding region 17 includes an interface 27 b between the AlGaN cladding layer 25 and the InAlGaN cladding layer 26.
- the misfit dislocation density at the interface 27 b between the InAlGaN cladding layer 26 and the AlGaN cladding layer 25 is larger than the misfit dislocation density at the interface 27 a between the core semiconductor region 15 and the first cladding region 17. This is because the Al composition of the AlGaN layer 25 is increased and / or the film thickness is increased as the InAlGaN cladding layer 26 is lattice-relaxed by introducing misfit dislocation density. Confinement can be improved.
- the interface 27a between the core semiconductor region 15 and the first cladding region 17 is separated from the interface 27b having a large misfit dislocation density by the InAlGaN layer.
- the Al composition of the AlGaN cladding layer 25 is preferably 0.05 or more.
- the AlGaN cladding layer 25 having a practical thickness can be relaxed on the GaN support substrate.
- the InAlGaN cladding layer 26 can be relaxed on the AlGaN cladding layer 25.
- the Al composition of the AlGaN cladding layer 25 is preferably 0.2 or less. If the Al composition is too large, there is a high possibility that the AlGaN cladding layer 25 is relaxed in the direction perpendicular to the c-axis off direction and the crystal quality of the AlGaN cladding layer 25 is deteriorated.
- the second cladding region 19 includes a p-type AlGaN cladding layer 35 and a p-type InAlGaN cladding layer 36.
- the p-type InAlGaN cladding layer 36 is provided between the p-type AlGaN cladding layer 35 and the active layer 21.
- the p-type InAlGaN cladding layer 35 forms a junction 27 c with the core semiconductor region 15.
- the Al composition is increased in order to improve the light confinement property of the AlGaN layer 35. And / or increasing the thickness of the AlGaN layer 35.
- the second cladding region 19 composed of the AlGaN cladding layer 35 and the InAlGaN cladding layer 36 has a good junction with the refractive index necessary for the cladding and the core semiconductor region 15. And a lattice constant of 27c can be provided.
- the second cladding region 19 includes an interface 27 d between the AlGaN cladding layer 35 and the InAlGaN cladding layer 36.
- the misfit dislocation density at the interface 27 d between the InAlGaN cladding layer 36 and the AlGaN cladding layer 35 is larger than the misfit dislocation density at the interface 27 c between the core semiconductor region 15 and the second cladding region 19. This is because the Al composition of the AlGaN layer 35 is increased and / or the film thickness is increased as the AlGaN cladding layer 35 is lattice-relaxed by introducing misfit dislocation density. Confinement can be improved.
- the interface 27c between the core semiconductor region 15 and the second cladding region 19 is separated from the interface 27d having a large misfit dislocation density by the InAlGaN layer.
- the Al composition of the AlGaN cladding layer 35 is preferably 0.05 or more.
- the Al composition is 0.05 or more, the AlGaN cladding layer 35 can be relaxed on the GaN support substrate.
- the AlGaN cladding layer 35 can be relaxed on the InAlGaN cladding layer 36.
- the Al composition of the AlGaN cladding layer 35 is preferably 0.2 or less.
- the Al composition is too large, there is an increased possibility that the AlGaN cladding layer 35 is relaxed in the direction perpendicular to the c-axis off direction and the crystal quality of the AlGaN cladding layer 35 is deteriorated.
- the misfit dislocation density at the interface 27b between the InAlGaN cladding layer 26 and the AlGaN cladding layer 25 is preferably 1 ⁇ 10 4 cm ⁇ 1 or more.
- this dislocation density dislocation is introduced into the interface 27b, lattice relaxation occurs in one of the semiconductor layers associated with the interface 27b. Lattice relaxation can provide an AlGaN cladding layer 25 that is favorable for optical confinement.
- the misfit dislocation density at the interface 27a between the core semiconductor region 15 and the first cladding region 17 is preferably less than 1 ⁇ 10 4 cm ⁇ 1 . Thereby, the optical loss resulting from the light scattering by misfit dislocation can be reduced.
- the core semiconductor region 15 made of a relatively thin semiconductor stack is composed of semiconductor layers 21, 23, 29, 31, 33, and 37 that are coherently grown.
- the misfit dislocation density at the interface 27 d between the InAlGaN cladding layer 36 and the AlGaN cladding layer 35 is preferably 1 ⁇ 10 4 cm ⁇ 1 or more.
- this dislocation density dislocation is introduced into the interface 27d, lattice relaxation occurs in one of the semiconductor layers associated with the interface 27d. Lattice relaxation can provide an AlGaN cladding layer 35 that is favorable for optical confinement.
- Lattice vector LVC25 consists of a transverse component V25 T perpendicular to the longitudinal component V25 L and said longitudinal component in the direction of the normal axis Nx.
- Lattice vector LVC26 consists of a transverse component V26 T perpendicular to the longitudinal component V26 L and said longitudinal component in the direction of the normal axis Nx.
- the transverse component V25 T is smaller than the transverse component V26 T.
- the c-axis direction in the gallium nitride-based semiconductor of the gallium nitride-based semiconductor layer 31 and the magnitude of the lattice constant d31 in the c-axis direction are represented by a lattice vector LVC31.
- the lattice vector LVC31 includes a vertical component V31 L in the direction of the normal axis Nx and a horizontal component V31 T orthogonal to the vertical component.
- the transverse component V25 T is smaller than the transverse component V31 T.
- the c-axis direction in AlGaN of the p-type AlGaN cladding layer 35 and the magnitude of the lattice constant d35 in the c-axis direction are represented by a lattice vector LVC35.
- the lattice vector LVC35 includes a vertical component V35 L in the direction of the normal axis Nx and a horizontal component V35 T orthogonal to the vertical component.
- the c-axis direction in InAlGaN of the p-type InAlGaN cladding layer 36 and the magnitude of the lattice constant d36 in the c-axis direction are represented by a lattice vector LVC36.
- Lattice vector LVC36 consists of a transverse component V36 T perpendicular to the longitudinal component V36 L and said longitudinal component in the direction of the normal axis Nx.
- the transverse component V35 T is smaller than the transverse component V36 T.
- the c-axis direction in the gallium nitride-based semiconductor of the gallium nitride-based semiconductor layer 33 and the magnitude of the lattice constant d33 in the c-axis direction are represented by a lattice vector LVC33.
- the lattice vector LVC33 is composed of a vertical component V33 L in the direction of the normal axis Nx and a horizontal component V33 T orthogonal to the vertical component.
- the transverse component V35 T is smaller than the transverse component V33 T.
- the c-axis direction in the gallium nitride semiconductor of the support base 13 and the magnitude of the lattice constant d13 in the c-axis direction are represented by a lattice vector LVC13.
- the lattice vector LVC13 includes a vertical component V13 L in the direction of the normal axis Nx and a horizontal component V13 T orthogonal to the vertical component.
- the transverse component V25 T is smaller than the transverse component V13 T.
- the misfit dislocation density at the interface 27 e between the AlGaN cladding layer 25 and the support base 13 in the first cladding region 17 is preferably larger than the misfit dislocation density at the interface 27 a between the core semiconductor region 15 and the first cladding region 17.
- the refractive index of the AlGaN cladding layer 25 can be reduced, and the optical confinement in the core semiconductor region 15 can be improved.
- the AlGaN cladding layer 25 in the first cladding region 17 is lattice-relaxed on the support base 13. Therefore, the optical confinement by the first cladding region 17 can be improved by increasing the Al composition of the AlGaN cladding layer 25 and / or increasing the thickness of the AlGaN cladding layer 25.
- the misfit dislocation density at the interface 27e between the AlGaN cladding layer 26 and the support base 13 in the first cladding region 17 is preferably 1 ⁇ 10 4 cm ⁇ 1 or more. AlGaN corresponding to this dislocation density can provide good optical confinement.
- the AlGaN cladding layer 25 in the n-type cladding region 17 is lattice-relaxed on the nonpolar main surface 13 a of the support base 13.
- the thickness D25 of the AlGaN cladding layer 25 preferably exceeds the critical film thickness in the Al composition of the AlGaN cladding layer 25.
- the lattice constant lateral component V13 T is larger than the lattice constant lateral component V25 T of the n-type AlGaN cladding layer 25.
- the InAlGaN cladding layer 25 in the n-type cladding region 17 is lattice-relaxed on the nonpolar plane of the AlGaN cladding layer 25.
- the thickness D26 of the InAlGaN cladding layer 26 preferably exceeds the critical film thickness in the Al composition and In composition of the InAlGaN cladding layer 26.
- Transverse component V25 T of the lattice constant transverse component V26 T is smaller than a lattice constant of the n-type InAlGaN cladding layer 26.
- a gallium nitride based semiconductor layer 31 On the InAlGaN cladding layer 26, a gallium nitride based semiconductor layer 31, an active layer 21, a gallium nitride based semiconductor layer 37, an electron block layer 23, a gallium nitride based semiconductor layer 33 and an InAlGaN cladding layer 36 are coherently grown. Therefore, as shown in FIG. 2, the lattice constants of the gallium nitride semiconductor layer 31, the active layer 21, the gallium nitride semiconductor layer 37, the electron block layer 23, the gallium nitride semiconductor layer 33, and the InAlGaN cladding layer 36 are The components are equal to each other.
- the interfaces 27b and 27e having a large dislocation density are separated from the interface 27a between the core semiconductor region 15 and the cladding region 17, the optical loss due to scattering due to the dislocation is small.
- the AlGaN cladding layer 35 in the p-type cladding region 19 is lattice-relaxed on the nonpolar main surface of the InAlGaN cladding layer 36.
- the thickness D35 of the AlGaN cladding layer 35 preferably exceeds the critical film thickness in the Al composition of the AlGaN cladding layer 35.
- the lattice constant transverse component V35 T is smaller than the lattice constant transverse component V36 T of the InAlGaN cladding layer.
- the InAlGaN cladding layer 36 in the p-type cladding region 19 is not lattice-relaxed on the nonpolar surface of the core semiconductor region 15.
- the thickness D36 of the InAlGaN cladding layer 36 is preferably equal to or less than the critical film thickness in the Al composition and In composition of the InAlGaN cladding layer 36.
- the InAlGaN clad layer 36 and the InAlGaN clad layer 26 are coherently grown on the nonpolar plane of the core semiconductor region 15 coherently grown.
- the lattice constant lateral component V36 T is lattice-matched to the lattice constant lateral component V33 T of the gallium nitride based semiconductor layer 33.
- the active layer 21 has a quantum well structure 29.
- the quantum well structure 29 includes barrier layers 29a and well layers 29b arranged alternately.
- the barrier layer 29a is made of, for example, InGaN or GaN
- the well layer 29b is made of, for example, InGaN or the like.
- the well layer 29b includes a strain corresponding to the difference between the lattice constant of the well layer 29b and the lattice constant of the gallium nitride based semiconductor layer 31
- the barrier layer 29a includes the lattice constant of the barrier layer 29a and the gallium nitride based semiconductor layer 31. The distortion according to the difference from the lattice constant is included.
- the first gallium nitride based semiconductor layer 31 can function as a light guide layer.
- the second gallium nitride based semiconductor layer 33 can serve as a light guide layer.
- the third gallium nitride based semiconductor layer 37 can function as a light guide layer.
- the refractive index of the first gallium nitride based semiconductor layer 31 is larger than the refractive index of the first cladding region 17.
- the refractive indexes of the second and third gallium nitride based semiconductor layers 33 and 37 are larger than the refractive index of the electron block layer 23 and larger than the refractive index of the p-type cladding layer 19.
- the first gallium nitride based semiconductor layer 31 includes first and second semiconductor layers 31a and 31b, and the band gap of the first semiconductor layer 31a is larger than the band gap of the second semiconductor layer 31b.
- the third gallium nitride based semiconductor layer 37 includes first and second semiconductor layers 37a and 37b, and the band gap of the first semiconductor layer 37a is smaller than the band gap of the second semiconductor layer 37b.
- the nitride semiconductor light emitting device 11 can include a p-type contact layer 39 provided on the p-type cladding layer 19.
- the p-type contact layer 39 can be made of GaN, AlGaN, or the like.
- the p-side electrode 41 a is in contact with the p-type contact layer 39 through the opening of the insulating film 43.
- the nitride semiconductor light emitting device 11 can include an n-side electrode 41 b that is in contact with the back surface 13 b of the support base 13.
- the angle ALPHA formed by the c-axis (VC) of the hexagonal gallium nitride semiconductor of the support base 13 and the normal axis Nx is preferably 10 degrees or more.
- the angle is preferably 170 degrees or less. In this range, it is possible to obtain a good light confinement property by utilizing generation of a slip surface in nonpolar (semipolar and nonpolar).
- the angle ALPHA is preferably 10 degrees to 80 degrees or 100 degrees to 170 degrees. According to this angle range, it is possible to obtain a good light confinement property by utilizing generation of a slip surface in the semipolar state.
- the angle ALPHA is preferably 63 degrees or more and 80 degrees or less, or 100 degrees or more and 117 degrees or less. According to this angle range, it is easy to generate dislocations by introducing a slip surface, and the degree of freedom in device design is high. In addition, the semipolar plane in this angular range tends to be excellent in In incorporation.
- the gallium nitride based semiconductor layer 31 in the core semiconductor region 15 forms a junction 27 a with the InAlGaN cladding layer 26 in the first cladding region 17.
- the lattice constant d26 of the InAlGaN cladding layer 26 is equal to the lattice constant specific to InAlGaN in the InAlGaN cladding layer 26 when the InAlGaN cladding layer 26 is completely lattice-relaxed.
- the lattice constant d25 of the AlGaN cladding layer 25 is equal to the lattice constant inherent to AlGaN in the AlGaN cladding layer 25 when the AlGaN cladding layer 25 is completely lattice-relaxed.
- the lattice constant d26 is equal to or less than the lattice constant d310 when the gallium nitride based semiconductor layer 31 is not distorted (specific to the gallium nitride based semiconductor of the gallium nitride based semiconductor layer 31).
- the lattice constant d26 is preferably larger than the lattice constant d25.
- dislocations are introduced into the interface between the AlGaN cladding layer 25 and the InAlGaN cladding layer 26 when the difference between the lattice constant d26 and the lattice constant d25 is increased.
- the difference between the lattice constant d26 and the lattice constant d310 can be reduced, and generation of optical loss due to dislocation can be avoided in the junction 27a between the first light guide layer and the InAlGaN cladding layer 26.
- the gallium nitride based semiconductor layer 31 is coherently grown on the InAlGaN cladding layer 26.
- the core semiconductor region 15 is coherently grown on the InAlGaN cladding layer 26.
- the InAlGaN cladding layer 26 is preferably lattice-matched to the gallium nitride based semiconductor layer 31 with respect to the projection direction of the c-axis on the principal surface 13a.
- the lattice constant relationship (d330 ⁇ d36> d35) is satisfied, the same technical contribution as above is obtained.
- FIG. 3 is a drawing showing the energy level of the conduction band in the cladding region.
- the nitride semiconductor light emitting device 11 can have at least one of the following structure 1 and structure 2. Structure 1 and Structure 2 will be described with reference to the light emitting device having the conduction band energy level shown in FIG.
- the band gap E25a of the AlGaN cladding layer 25a is preferably greater than or equal to the band gap E26a of the InAlGaN cladding layer 26a.
- the lattice-relaxed AlGaN cladding layer 25a can provide a large band gap E25a that is difficult to realize with the quaternary InAlGaN cladding layer 26a.
- the thickness D26a of the InAlGaN cladding layer 26a is preferably thinner than the thickness D25a of the AlGaN cladding layer 25a. Thereby, the light confinement property by the AlGaN cladding layer can be utilized. Further, it is possible to avoid a decrease in throughput due to the growth of thick InAlGaN.
- the thickness D26a of the InAlGaN cladding layer 26a is preferably 0.05 ⁇ m or more.
- An InAlGaN cladding layer that is too thin cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer (corresponding to the interface 27b in FIG. 3) from the core semiconductor region 15, and an optical loss occurs at this interface.
- the film thickness D26a of the InAlGaN cladding layer 26a is preferably 0.3 ⁇ m or less. Too thick InAlGaN reduces the contribution to optical confinement by the AlGaN cladding layer.
- the band gap E35a of the AlGaN cladding layer 35a is preferably greater than or equal to the band gap E36a of the InAlGaN cladding layer 36a.
- the lattice-relaxed AlGaN cladding layer 35a can provide a large band gap E35a that is difficult to realize with the quaternary InAlGaN cladding layer 36a.
- the thickness D36a of the InAlGaN cladding layer 36a is preferably thinner than the thickness D35a of the AlGaN cladding layer 35a. Thereby, the light confinement property by the AlGaN cladding layer 35a can be utilized. Further, it is possible to avoid a decrease in throughput due to the growth of thick InAlGaN.
- the thickness D36a of the InAlGaN cladding layer 36a is preferably 0.05 ⁇ m or more.
- An InAlGaN cladding layer that is too thin cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer (corresponding to the interface 27d in FIG. 3) from the core semiconductor region 15, and an optical loss occurs at this interface.
- the film thickness D36a of the InAlGaN cladding layer 36a is preferably 0.3 ⁇ m or less. Too thick InAlGaN reduces the contribution to optical confinement by the AlGaN cladding layer.
- FIG. 4 is a drawing showing the energy level of the conduction band in the cladding region.
- the nitride semiconductor light emitting device 11 can have at least one of the following structure 3 and structure 4. The structures 3 and 4 will be described with reference to the light emitting device having the conduction band energy level shown in FIG.
- the band gap E26b of the InAlGaN cladding layer 26b is preferably greater than or equal to the band gap E25b of the AlGaN cladding layer 25b.
- InAlGaN can be grown thick and desired optical confinement can be obtained as the entire cladding region 17.
- the thickness D26b of the InAlGaN cladding layer 26b is preferably thicker than the thickness D25b of the AlGaN cladding layer 25b.
- the interface 27 b between the InAlGaN cladding layer 26 b and the AlGaN cladding layer 25 b can be separated from the core semiconductor region 15.
- the thickness D26b of the InAlGaN cladding layer 26b is preferably 0.05 ⁇ m or more.
- the thin InAlGaN layer cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer from the core semiconductor region, and an optical loss due to scattering occurs at this interface (corresponding to the interface 27b in FIG. 4).
- the film thickness D26b of the InAlGaN cladding layer 26b is preferably 1.0 ⁇ m or less. A film thickness upper limit of 1.0 ⁇ m is practical even for InAlGaN in which the growth rate cannot be increased.
- the band gap E36b of the InAlGaN cladding layer 36b is preferably greater than or equal to the band gap E25b of the AlGaN cladding layer 35b.
- InAlGaN can be grown thick and desired optical confinement can be obtained for the entire cladding region 19.
- the thickness D36b of the InAlGaN cladding layer 36b is preferably thicker than the thickness D35b of the AlGaN cladding layer 35b.
- the interface 27 d between the InAlGaN cladding layer 36 b and the AlGaN cladding layer 35 b can be separated from the core semiconductor region 15.
- the thickness D36b of the InAlGaN cladding layer 36b is preferably 0.05 ⁇ m or more.
- the thin InAlGaN layer cannot separate the interface between the InAlGaN cladding layer and the AlGaN cladding layer from the core semiconductor region, and an optical loss due to scattering occurs at this interface (corresponding to the interface 27d in FIG. 4).
- the film thickness D36b of the InAlGaN cladding layer 36b is preferably 1.0 ⁇ m or less. A film thickness upper limit of 1.0 ⁇ m is practical even for InAlGaN in which the growth rate cannot be increased.
- a light-emitting element in which the structure 1 and the structure 4 are combined in the structures 1 to 4 shown in FIGS. 3 and 4 can be obtained.
- a light-emitting element in which the structures 2 and 3 are combined can be obtained.
- technical contributions according to the combination of structures can be obtained.
- Example 1 A method of manufacturing a nitride laser diode will be described with reference to FIGS.
- This nitride laser diode has an LD structure shown in FIG.
- step S101 a GaN substrate 51 having a semipolar surface was prepared.
- the main surface 51a of the GaN substrate 51 is inclined at 75 degrees in the m-axis direction.
- a laser diode (LD) structure that emits light in the 450 nm band was fabricated on the (20-21) plane of this semipolar GaN substrate.
- a normal vector NV and a c-axis vector VC are shown together with a normal axis Nx and a c-axis Cx of the main surface 51a.
- a plurality of gallium nitride based semiconductor layers are grown on the GaN substrate 51 by using metal organic vapor phase epitaxy to produce an epitaxial substrate.
- Trimethyl gallium (TMG), trimethyl aluminum (TMA), trimethyl indium (TMI), and ammonia (NH 3 ) were used as raw materials.
- Silane (SiH 4 ) and biscyclopentadienyl magnesium (CP 2 Mg) were used as dopant gases.
- step S102 the GaN substrate 51 is disposed in the growth furnace 10.
- Thermal cleaning of the GaN substrate 51 is performed using the growth furnace 10.
- a heat treatment is performed for 10 minutes while flowing a gas containing NH 3 and H 2 through the growth reactor 10 at a temperature of 1050 degrees Celsius.
- the source gas is supplied to the growth furnace 10 and the n-type Al 0.06 Ga 0.94 is formed on the main surface 51a of the GaN substrate 51 at 1100 degrees Celsius.
- An N clad layer (thickness 1.9 ⁇ m) 53a is grown.
- the presence or absence of lattice relaxation can be controlled by the composition, film thickness, and lattice constant difference of the growing AlGaN semiconductor, and the AlGaN semiconductor is relaxed in this embodiment.
- step S103 after changing the growth temperature to 840 degrees Celsius, the n-type In 0.02 Al 0.09 Ga 0.89 N cladding layer (thickness 100 nm) 55 is formed on the cladding layer 53a. To grow. After this growth, the core semiconductor region is grown. After changing the growth temperature to 1100 degrees Celsius, an n-type GaN light guide layer (thickness 100 nm) 57a is grown on the cladding layers 53a and 55. Next, an undoped In 0.02 Ga 0.98 N optical guide layer (thickness 50 nm) 57b is grown at a temperature of 840 degrees Celsius. An active layer 59 having a quantum well structure is grown on the light guide layer 57b.
- the active layer 59 includes well layers and barrier layers arranged alternately, and the number of well layers is three.
- the growth temperature of the InGaN well layer is 790 degrees Celsius, and its thickness is 3 nm.
- the growth temperature of the GaN barrier layer is 840 degrees Celsius, and its thickness is 15 nm.
- an undoped In 0.02 Ga 0.98 N optical guide layer (thickness 50 nm) 61a is subsequently grown at the same temperature.
- a p-type GaN light guide layer (thickness 50 nm) 61b is grown on the light guide layer 61a at a temperature of 1000 degrees Celsius.
- a p-type Al 0.12 Ga 0.88 N electron blocking layer (thickness 20 nm) 63 is grown on the light guide layer 61b.
- a p-type GaN light guide layer (thickness: 100 nm) 61c is grown on the electron block layer 63 at the same temperature.
- a p-type In 0.02 Al 0.09 Ga 0.89 N clad layer (thickness 100 nm) 65 is grown. Through these steps, the semiconductor stacked layer 53b is formed.
- step S104 the p-type Al 0.06 Ga 0.94 N clad layer (thickness 400 nm) 67 and p are formed on the clad layer 65 at a temperature of 1000 degrees Celsius in the growth furnace 10.
- a type GaN contact layer (thickness 50 nm) 69 is grown.
- the p-type semiconductor stack 53c is formed. As a result, an epitaxial substrate E2 was produced.
- the band gap energy of Al 0.06 Ga 0.94 N is 3.57 eV
- the band gap energy of In 0.02 Al 0.09 Ga 0.89 N is 3.54 eV
- the lattice constant of In 0.02 Al 0.09 Ga 0.89 N is almost lattice matched to GaN.
- the misfit dislocation was estimated using a transmission electron microscope image.
- the misfit dislocation density at the junction interface 49a between the AlGaN cladding layer 53a and the InAlGaN cladding layer 55 is 8 ⁇ 10 4 cm ⁇ 1 .
- the misfit dislocation density at the junction interface 49b between the AlGaN cladding layer 67 and the InAlGaN cladding layer 65 was 8 ⁇ 10 4 cm ⁇ 1 .
- Misfit dislocations were not observed at the junction interface 49c between the GaN light guide layer 57a and the InAlGaN cladding layer 55. Further, no misfit dislocation was observed at the junction interface 49d between the GaN light guide layer 61c and the InAlGaN cladding layer 65.
- An LD structure having the same was produced.
- the n-side cladding layer is made of Al 0.06 Ga 0.94 N grown at 1100 degrees Celsius.
- an n-type GaN light guide layer (thickness 100 nm) 67a, an undoped In 0.02 Ga 0.98 N light guide layer (thickness 50 nm) 67b, and an active layer having a quantum well structure are grown under the same growth conditions as the core semiconductor region.
- undoped In 0.02 Ga 0.98 N light guide layer (thickness 50 nm) 71a, p-type GaN light guide layer (thickness 50 nm) 71b, p-type Al 0.12 Ga 0.88 N electron blocking layer (thickness 20 nm) 73, and p A type GaN optical guide layer (thickness 100 nm) 71c was grown.
- a p-side cladding layer 77 and a p-type GaN contact layer (thickness 50 nm) 79 are grown without forming an InAlGaN cladding.
- an epitaxial substrate EC was produced.
- the junction where misfit dislocations are generated is different from that in the epitaxial substrate E2.
- many misfit dislocations were observed at the interface 49e between the n-side cladding layer 63a and the n-type GaN light guide layer 67a and at the interface 49f between the p-side cladding layer 77 and the p-type GaN light guide layer 71c.
- the misfit dislocation density at the interface 49e was 8 ⁇ 10 4 cm ⁇ 1 and the misfit dislocation density at the interface 49f was 4 ⁇ 10 4 cm ⁇ 1 .
- a p-side electrode 70a made of Ni / Au is formed in a stripe window (width 10 ⁇ m) of the silicon oxide film, and a pad electrode made of Ti / Au is formed.
- an n-side electrode 70b made of Ti / Al and a pad electrode made of Ti / Au are formed on the back surface of the GaN substrate 51.
- substrate products P2 and PC are produced from the epitaxial substrates E2 and EC.
- the substrate products P2 and PC are cleaved at intervals of 800 ⁇ m to produce gain guide type laser diodes LD2 and LC1, respectively.
- a dielectric multilayer film made of SiO 2 / TiO 2 is formed on the cleavage plane.
- the threshold currents of the laser diodes LD2 and LC1 were 750 mA and 900 mA, respectively. Comparing the intensity of spontaneous emission in the laser diodes LD2 and LC1, they were almost the same. In the laser diode LD2, the waveguide loss is reduced due to the dislocation interface being separated from the waveguide region. Therefore, the laser diode LD2 of the embodiment has a lower threshold value than the laser diode LC1 of the comparative example. It is thought that it showed.
- the nitride laser diode LD3 of Example 2 has the LD structure shown in FIG.
- the laser diode LD3 is different from the laser diode LD2 in the structure of the n-side cladding and the p-side cladding.
- the laser diode LD3 has an n-type cladding layer composed of an n-type Al 0.04 Ga 0.96 N cladding layer (thickness 1.6 ⁇ m) 81a and an n-type In 0.02 Al 0.09 Ga 0.89 N cladding layer (thickness 400 nm) 81b.
- the laser diode LD3 has a p-side cladding layer composed of a p-type In 0.02 Al 0.09 Ga 0.89 N cladding layer (thickness 400 nm) 83.
- the Al composition of the n-type AlGaN cladding layer is lowered from 0.06 to 0.04, and the film thickness of the n-type AlGaN cladding layer is reduced from 1.9 ⁇ m to 1.6 ⁇ m.
- the thickness of the n-type InAlGaN cladding layer is increased from 100 nm to 400 nm.
- the band gap energy of Al 0.04 Ga 0.96 N is 3.52 eV
- the band gap energy of In 0.02 Al 0.09 Ga 0.89 N is 3.54 eV.
- the nitride laser diode LC2 of the comparative example has an LD structure shown in FIG.
- the laser diode LC2 differs from the laser diode LD3 in the n-side cladding structure.
- the laser diode LC2 has an n-side cladding layer composed of a single n-type In 0.02 Al 0.09 Ga 0.89 N cladding layer (thickness 2 ⁇ m) 85.
- misfit dislocations were observed at the interface between the AlGaN layer 81a and the AlGaN layer 81b.
- the misfit dislocation density was 2 ⁇ 10 4 cm ⁇ 1 .
- the cladding layer of the laser diode LC2 is made of InAlGaN, no misfit dislocation was observed in the junction related to the cladding layer.
- the threshold values of the laser diode LD3 and the laser diode LC2 were about 800 mA. Although misfit dislocations are introduced into the laser diode LD3, the threshold value of the laser diode LD3 is substantially equal to the threshold value of the laser diode LC2 that does not include misfit dislocations. For this reason, misfit dislocations in the cladding region of the laser diode LD3 do not significantly affect the light guiding in the laser stripe.
- the epitaxial growth for the epitaxial substrate was about 2.5 hours, while in the laser diode LC2, the epitaxial growth for the epitaxial substrate was about 3.7 hours. This is due to the fact that it takes a long time to grow InAlGaN.
- the laser diode LD3 employs a multilayer clad of AlGaN and InAlGaN. Therefore, in the laser diode LD3, the throughput can be improved without impairing the laser characteristics by employing the two-layer clad.
- the laser structure LD4 shown in FIG. 9 is produced.
- a GaN substrate 51 having a main surface with a 75-degree off angle is prepared.
- the following gallium nitride based semiconductor films were grown on the GaN substrate 51: n-type GaN buffer layer 91; n-type Al 0.08 Ga 0.92 N clad layer (thickness 1.2 ⁇ m) 92; n-type GaN light guide layer (thickness) 300 nm) 93, InGaN / GaN active layer (well layer 3 nm, barrier layer 15 nm) 94, undoped GaN optical guide layer (thickness 50 nm) 95, p-type Al 0.11 Ga 0.89 N electron blocking layer (thickness 10 nm) 96, p-type GaN optical guide layer (thickness 250 nm) 97, p-type Al 0.08 Ga 0.92 N clad layer (thickness 400 nm) 98 and p-type GaN
- FIG. 10 is a drawing showing reciprocal lattice mapping of (20-24) in an epitaxial substrate.
- the incident direction of the X-ray is a direction parallel to the inclination direction of the c-axis.
- the diffraction spot S CLAD of the AlGaN cladding layer is shifted from the diffraction spot S SUB of the GaN substrate, and the n-type AlGaN cladding layer is lattice-relaxed.
- the diffraction spot of the p-type AlGaN cladding layer substantially overlaps the diffraction spot of the n-type AlGaN cladding layer.
- the p-type AlGaN cladding layer is lattice-relaxed.
- the diffraction spot S GUIDE of the GaN light guide layer is shifted from the diffraction spot S SUB of the GaN substrate.
- the GaN light guide layer is lattice-relaxed.
- the diffraction spot S GUIDE of the GaN light guide layer is shifted in the direction of the diffraction spot S SUB of the GaN substrate with respect to the diffraction spot S CLAD of the AlGaN cladding, and the core semiconductor region composed of the GaN light guide layer and the light emitting layer is the AlGaN cladding. Relaxing on the layer, the lattice constant of the core semiconductor region escapes the constraints of the AlGaN cladding.
- the laser structure LD4 includes three lattice relaxations. That is, since the plurality of diffraction spots are not arranged on a straight line parallel to the y-axis, these three semiconductors are not in a lattice matching state.
- an object of the present invention is to provide a nitride semiconductor light emitting device that can improve light confinement and reduce optical loss due to dislocations in a light emitting device formed on a nonpolar plane.
- SYMBOLS 11 Nitride semiconductor light emitting element, 13 ... Support base, 13a ... Main surface of support base, 13b ... Back surface of support base, 15 ... Core semiconductor region, 17 ... First clad region, 19 ... Second clad region, S ... Cartesian coordinate system, VC ... c-axis vector, NV ... normal vector, Nx ... normal axis, Cx ... c-axis, 21 ... active layer, 23 ... carrier block layer, 25 ... n-type AlGaN cladding layer, 26 ... n-type InAlGaN Cladding layer, 27a to 27f ... junction, 35 ...
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Biophysics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Led Devices (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
図5及び図6を参照しながら、窒化物レーザダイオードを作製する方法を説明する。この窒化物レーザダイオードは図7(a)に示されるLD構造を有する。工程S101では、半極性面を有するGaN基板51を準備した。このGaN基板51の主面51aは、m軸方向に75度で傾斜している。引き続く説明では、この半極性GaN基板の(20-21)面上に、450nm帯で発光するレーザダイオード(LD)構造を作製した。図5(a)を参照すると、主面51aの法線軸Nx及びc軸Cxと共に、法線ベクトルNV及びc軸ベクトルVCが示されている。引き続き有機金属気相成長法を用いて、GaN基板51上に複数の窒化ガリウム系半導体層を成長して、エピタキシャル基板を作製する。原料にはトリメチルガリウム(TMG)、トリメチルアルミニウム(TMA)、トリメチルインジウム(TMI)、アンモニア(NH3)を用いた。ドーパントガスとして、シラン(SiH4)及びビスシクロペンタジエニルマグネシウム(CP2Mg)を用いた。
実施例2の窒化物レーザダイオードLD3は図8(a)に示されるLD構造を有する。レーザダイオードLD3は、レーザダイオードLD2と比べて、n側クラッド及びp側クラッドの構造の点で異なる。レーザダイオードLD3は、n型Al0.04Ga0.96Nクラッド層(厚さ1.6μm)81aとn型In0.02Al0.09Ga0.89Nクラッド層(厚さ400nm)81bからなるn側クラッド層とを有する。レーザダイオードLD3は、p型In0.02Al0.09Ga0.89Nクラッド層(厚さ400nm)83からなるp側クラッド層を有する。詳細には、n型AlGaNクラッド層のAl組成が0.06から0.04に低くされており、n型AlGaNクラッド層の膜厚が1.9μmから1.6μmに薄くなっている。n型InAlGaNクラッド層の膜厚が100nmから400nmに厚くなっている。Al0.04Ga0.96Nのバンドギャップエネルギは3.52eVであり、In0.02Al0.09Ga0.89Nのバンドギャップエネルギは3.54eVである。
この実施例では、図9に示されるレーザ構造LD4を作製する。75度オフ角の主面を有するGaN基板51を準備する。このGaN基板51上に以下の窒化ガリウム系半導体膜を成長した:n型GaNバッファ層91;n型Al0.08Ga0.92Nクラッド層(厚さ1.2μm)92、n型GaN光ガイド層(厚さ300nm)93、InGaN/GaN活性層(井戸層3nm、障壁層15nm)94、アンドープGaN光ガイド層(厚さ50nm)95、p型Al0.11Ga0.89N電子ブロック層(厚さ10nm)96、p型GaN光ガイド層(厚さ250nm)97、p型Al0.08Ga0.92Nクラッド層(厚さ400nm)98及びp型GaNコンタクト層(厚さ50nm)99。これらの成長によって、エピタキシャル基板E4が作製された。図9における半導体層の横幅は、当該半導体層の格子定数の大きさの関係を示す。
Claims (20)
- 窒化物半導体発光素子であって、
六方晶系窒化ガリウム半導体からなる支持基体と、
第1導電型窒化ガリウム系半導体からなる第1クラッド領域と、
第2導電型窒化ガリウム系半導体からなる第2クラッド領域と、
活性層及びキャリアブロック層を含むコア半導体領域と
を備え、
前記六方晶系窒化ガリウム半導体のc軸は前記支持基体の前記主面の法線軸と異なる方向に向くと共に前記六方晶系窒化ガリウム半導体のc軸及び前記支持基体の前記法線軸によって規定される平面は所定の方向に延在しており、
前記コア半導体領域は、前記第1クラッド領域と前記第2クラッド領域との間に設けられ、
前記コア半導体領域、前記第1クラッド領域及び前記第2クラッド領域は前記支持基体の前記主面上に搭載されており、
前記第1クラッド領域は、AlGaNクラッド層及びInAlGaNクラッド層を含み、
前記第1クラッド領域の前記InAlGaNクラッド層は前記第1クラッド領域の前記AlGaNクラッド層と前記活性層との間に設けられ、
前記第1クラッド領域の前記InAlGaNクラッド層は前記コア半導体領域に接合を成す、ことを特徴とする窒化物半導体発光素子。 - 前記第1クラッド領域において、前記InAlGaNクラッド層と前記AlGaNクラッド層との界面におけるミスフィット転位密度は前記コア半導体領域と前記第1クラッド領域との界面におけるミスフィット転位密度より大きい、ことを特徴とする請求項1に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層と前記AlGaNクラッド層との界面のミスフィット転位密度は1×104cm-1以上である、ことを特徴とする請求項2に記載された窒化物半導体発光素子。
- 前記コア半導体領域と前記第1クラッド領域との界面のミスフィット転位密度は1×104cm-1未満である、ことを特徴とする請求項2又は請求項3に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記AlGaNクラッド層のAl組成は0.05以上であり、0.2以下である、ことを特徴とする請求項1~請求項4のいずれか一項に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層の厚さは前記AlGaNクラッド層の厚さより薄い、ことを特徴とする請求項1~請求項5のいずれか一項に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層のバンドギャップは前記AlGaNクラッド層のバンドギャップ以下である、ことを特徴とする請求項1~請求項6のいずれか一項に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層の膜厚は0.05μm以上であり、0.3μm以下であることを特徴とする請求項7に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層のバンドギャップは前記AlGaNクラッド層のバンドギャップ以上である、ことを特徴とする請求項1~請求項6のいずれか一項に記載された窒化物半導体発光素子。
- 前記第1クラッド領域において、前記InAlGaNクラッド層の膜厚は0.05μm以上であり、1.0μm以下である、ことを特徴とする請求項9に記載された窒化物半導体発光素子。
- 前記コア半導体領域は第1光ガイド層を含み、
前記第1光ガイド層は前記第1クラッド領域の前記InAlGaNクラッド層と接合を成し、
前記第1クラッド領域の前記InAlGaNクラッド層におけるInAlGaN固有の格子定数は前記コア半導体領域の前記第1光ガイド層の窒化ガリウム系半導体に固有の格子定数以下であり、
前記第1クラッド領域の前記InAlGaNクラッド層の格子定数は前記第1クラッド領域の前記AlGaNクラッド層の格子定数より大きい、ことを特徴とする請求項1~請求項10のいずれか一項に記載された窒化物半導体発光素子。 - 前記InAlGaNクラッド層はc軸の前記主面への投影方向に関して前記第1光ガイド層に格子整合する、ことを特徴とする請求項11に記載された窒化物半導体発光素子。
- 前記第1クラッド領域はn型導電性を有し、
前記第1クラッド領域の前記AlGaNクラッド層と前記支持基体との界面におけるミスフィット転位密度は前記コア半導体領域と前記第1クラッド領域との界面におけるミスフィット転位密度より大きい、ことを特徴とする請求項1~請求項12のいずれか一項に記載された窒化物半導体発光素子。 - 前記第1クラッド領域はp型導電性を有し、
当該窒化物半導体発光素子は、前記第1クラッド領域上に設けられたp型コンタクト層を更に備え、
前記コア半導体領域は第2光ガイド層及び電子ブロック層を含み、
前記第2光ガイド層は前記電子ブロック層と前記第1クラッド領域との間に設けられ、
前記電子ブロック層は前記第2光ガイド層と前記活性層との間に設けられる、ことを特徴とする請求項1~請求項10のいずれか一項に記載された窒化物半導体発光素子。 - 前記第1クラッド領域はn型導電性を有し、
前記第2クラッド領域はp型導電性を有し、
前記第2クラッド領域は、AlGaNクラッド層及びInAlGaNクラッド層を含み、
前記第2クラッド領域の前記InAlGaNクラッド層は前記第2クラッド領域の前記AlGaNクラッド層と前記活性層との間に設けられ、
前記第2クラッド領域の前記InAlGaNクラッド層は前記コア半導体領域に接合を成し、
前記第2クラッド領域の前記InAlGaNクラッド層の格子定数は前記第2クラッド領域の前記AlGaNクラッド層の格子定数より大きい、ことを特徴とする請求項1~請求項11のいずれか一項に記載された窒化物半導体発光素子。 - 前記第2クラッド領域の前記AlGaNクラッド層と前記InAlGaNクラッド層との界面におけるミスフィット転位密度は前記コア半導体領域と前記第2クラッド領域との界面におけるミスフィット転位密度より大きい、ことを特徴とする請求項15に記載された窒化物半導体発光素子。
- 前記第2クラッド領域の前記AlGaNクラッド層と前記InAlGaNクラッド層との界面におけるミスフィット転位密度は1×104cm-1以上である、ことを特徴とする請求項15又は請求項16に記載された窒化物半導体発光素子。
- 前記六方晶系窒化ガリウム半導体のc軸と前記支持基体の前記法線軸との成す角度は10度以上であり、170度以下である、ことを特徴とする請求項1~請求項17のいずれか一項に記載された窒化物半導体発光素子。
- 前記角度は10度以上80度以下又は100度以上170度以下である、ことを特徴とする請求項1~請求項18のいずれか一項に記載された窒化物半導体発光素子。
- 前記角度は63度以上80度以下又は100度以上117度以下である、ことを特徴とする請求項1~請求項19のいずれか一項に記載された窒化物半導体発光素子。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201080020691.1A CN102422495B (zh) | 2009-05-11 | 2010-03-29 | 氮化物半导体发光元件 |
EP10774785A EP2432082A1 (en) | 2009-05-11 | 2010-03-29 | Nitride semiconductor light emitting element |
US13/294,034 US8513684B2 (en) | 2009-05-11 | 2011-11-10 | Nitride semiconductor light emitting device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009114887A JP5316210B2 (ja) | 2009-05-11 | 2009-05-11 | 窒化物半導体発光素子 |
JP2009-114887 | 2009-05-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/294,034 Continuation US8513684B2 (en) | 2009-05-11 | 2011-11-10 | Nitride semiconductor light emitting device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010131526A1 true WO2010131526A1 (ja) | 2010-11-18 |
Family
ID=43084905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/055589 WO2010131526A1 (ja) | 2009-05-11 | 2010-03-29 | 窒化物半導体発光素子 |
Country Status (7)
Country | Link |
---|---|
US (1) | US8513684B2 (ja) |
EP (1) | EP2432082A1 (ja) |
JP (1) | JP5316210B2 (ja) |
KR (1) | KR20120024678A (ja) |
CN (1) | CN102422495B (ja) |
TW (1) | TW201101533A (ja) |
WO (1) | WO2010131526A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011003661A (ja) * | 2009-06-17 | 2011-01-06 | Rohm Co Ltd | 半導体レーザ素子 |
JP5781292B2 (ja) * | 2010-11-16 | 2015-09-16 | ローム株式会社 | 窒化物半導体素子および窒化物半導体パッケージ |
JP2013168393A (ja) * | 2012-02-14 | 2013-08-29 | Sony Corp | 半導体素子 |
JP6019541B2 (ja) * | 2012-02-27 | 2016-11-02 | 国立大学法人山口大学 | 半導体発光素子 |
JP2015060978A (ja) | 2013-09-19 | 2015-03-30 | 株式会社東芝 | 半導体発光素子及びその製造方法 |
KR102347387B1 (ko) * | 2015-03-31 | 2022-01-06 | 서울바이오시스 주식회사 | 자외선 발광 소자 |
WO2020017207A1 (ja) * | 2018-07-20 | 2020-01-23 | ソニーセミコンダクタソリューションズ株式会社 | 半導体発光素子 |
JP2023117509A (ja) * | 2022-02-14 | 2023-08-24 | ヌヴォトンテクノロジージャパン株式会社 | 窒化物系半導体発光素子 |
WO2023153035A1 (ja) * | 2022-02-14 | 2023-08-17 | ヌヴォトンテクノロジージャパン株式会社 | 窒化物系半導体発光素子 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261160A (ja) * | 1998-03-10 | 1999-09-24 | Sharp Corp | 窒化物系化合物半導体レーザ素子及びその製造方法 |
JP2001237455A (ja) | 2000-02-23 | 2001-08-31 | Inst Of Physical & Chemical Res | 紫外域の短波長域において発光するInAlGaNおよびその製造方法ならびにそれを用いた紫外発光素子 |
JP2002324946A (ja) * | 2001-04-25 | 2002-11-08 | Ricoh Co Ltd | Iii族窒化物半導体発光素子 |
JP2008060375A (ja) * | 2006-08-31 | 2008-03-13 | Sanyo Electric Co Ltd | 窒化物系半導体発光素子の製造方法および窒化物系半導体発光素子 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001024285A (ja) | 1999-07-09 | 2001-01-26 | Ricoh Co Ltd | 半導体発光素子 |
JP4075324B2 (ja) * | 2001-05-10 | 2008-04-16 | 日亜化学工業株式会社 | 窒化物半導体素子 |
JP4924185B2 (ja) | 2007-04-27 | 2012-04-25 | 住友電気工業株式会社 | 窒化物半導体発光素子 |
JP2009094360A (ja) * | 2007-10-10 | 2009-04-30 | Rohm Co Ltd | 半導体レーザダイオード |
-
2009
- 2009-05-11 JP JP2009114887A patent/JP5316210B2/ja not_active Expired - Fee Related
-
2010
- 2010-03-29 CN CN201080020691.1A patent/CN102422495B/zh not_active Expired - Fee Related
- 2010-03-29 WO PCT/JP2010/055589 patent/WO2010131526A1/ja active Application Filing
- 2010-03-29 EP EP10774785A patent/EP2432082A1/en not_active Withdrawn
- 2010-03-29 KR KR1020117028529A patent/KR20120024678A/ko active IP Right Grant
- 2010-04-07 TW TW099110788A patent/TW201101533A/zh unknown
-
2011
- 2011-11-10 US US13/294,034 patent/US8513684B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261160A (ja) * | 1998-03-10 | 1999-09-24 | Sharp Corp | 窒化物系化合物半導体レーザ素子及びその製造方法 |
JP2001237455A (ja) | 2000-02-23 | 2001-08-31 | Inst Of Physical & Chemical Res | 紫外域の短波長域において発光するInAlGaNおよびその製造方法ならびにそれを用いた紫外発光素子 |
JP2002324946A (ja) * | 2001-04-25 | 2002-11-08 | Ricoh Co Ltd | Iii族窒化物半導体発光素子 |
JP2008060375A (ja) * | 2006-08-31 | 2008-03-13 | Sanyo Electric Co Ltd | 窒化物系半導体発光素子の製造方法および窒化物系半導体発光素子 |
Also Published As
Publication number | Publication date |
---|---|
CN102422495B (zh) | 2014-08-27 |
US8513684B2 (en) | 2013-08-20 |
TW201101533A (en) | 2011-01-01 |
JP5316210B2 (ja) | 2013-10-16 |
CN102422495A (zh) | 2012-04-18 |
EP2432082A1 (en) | 2012-03-21 |
US20120119240A1 (en) | 2012-05-17 |
KR20120024678A (ko) | 2012-03-14 |
JP2010263163A (ja) | 2010-11-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5316210B2 (ja) | 窒化物半導体発光素子 | |
JP4375497B1 (ja) | Iii族窒化物半導体素子、エピタキシャル基板、及びiii族窒化物半導体素子を作製する方法 | |
JP4924185B2 (ja) | 窒化物半導体発光素子 | |
JP4775455B2 (ja) | Iii族窒化物半導体レーザ、及びiii族窒化物半導体レーザを作製する方法 | |
WO2009107516A1 (ja) | Iii族窒化物半導体レーザ | |
WO2011007594A1 (ja) | Iii族窒化物半導体光素子 | |
US8748868B2 (en) | Nitride semiconductor light emitting device and epitaxial substrate | |
JP5326787B2 (ja) | Iii族窒化物半導体レーザダイオード、及びiii族窒化物半導体レーザダイオードを作製する方法 | |
WO2012161268A1 (ja) | 窒化物半導体レーザ素子、エピタキシャル基板、及び窒化物半導体レーザ素子を作製する方法 | |
JP5310382B2 (ja) | Iii族窒化物半導体光素子、及びiii族窒化物半導体光素子を作製する方法 | |
JP5651077B2 (ja) | 窒化ガリウム系半導体レーザ素子、及び、窒化ガリウム系半導体レーザ素子の製造方法 | |
JP5522147B2 (ja) | 窒化物半導体発光素子、及び、窒化物半導体発光素子の作製方法 | |
JP2010212651A (ja) | Iii族窒化物半導体素子、エピタキシャル基板、及びiii族窒化物半導体素子を作製する方法 | |
WO2011007776A1 (ja) | Iii族窒化物半導体素子、エピタキシャル基板、及びiii族窒化物半導体素子を作製する方法 | |
KR20110084296A (ko) | 발광 소자의 제조 방법 및 발광 소자 | |
US20130051418A1 (en) | Group iii nitride semiconductor laser device | |
JP5120350B2 (ja) | Iii族窒化物半導体素子及びエピタキシャルウエハ | |
JP2009224602A (ja) | 窒化物半導体レーザ、窒化物半導体レーザを作製する方法、及び窒化物半導体レーザのためのエピタキシャルウエハ | |
JP3867625B2 (ja) | 窒化物半導体発光素子 | |
JP5379216B2 (ja) | Iii族窒化物半導体レーザ | |
JP2011188000A (ja) | Iii族窒化物半導体レーザ、及びiii族窒化物半導体レーザを作製する方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080020691.1 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10774785 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20117028529 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010774785 Country of ref document: EP |