WO2008018482A1 - Élément semi-conducteur et son procédé de fabrication - Google Patents
Élément semi-conducteur et son procédé de fabrication Download PDFInfo
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- WO2008018482A1 WO2008018482A1 PCT/JP2007/065483 JP2007065483W WO2008018482A1 WO 2008018482 A1 WO2008018482 A1 WO 2008018482A1 JP 2007065483 W JP2007065483 W JP 2007065483W WO 2008018482 A1 WO2008018482 A1 WO 2008018482A1
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- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 body packages
- H01L33/483—Containers
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- 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
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- 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
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0425—Electrodes, e.g. characterised by the structure
- H01S5/04252—Electrodes, e.g. characterised by the structure characterised by the material
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- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
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- H01S2301/00—Functional characteristics
- H01S2301/17—Semiconductor lasers comprising special layers
- H01S2301/176—Specific passivation layers on surfaces other than the emission facet
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- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0201—Separation of the wafer into individual elements, e.g. by dicing, cleaving, etching or directly during growth
- H01S5/0202—Cleaving
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- H—ELECTRICITY
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- 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
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
- H01S5/0234—Up-side down mountings, e.g. Flip-chip, epi-side down mountings or junction down mountings
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- 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
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
- H01S5/02355—Fixing laser chips on mounts
- H01S5/0237—Fixing laser chips on mounts by soldering
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- 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
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
- H01S5/02375—Positioning of the laser chips
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- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02476—Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements
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- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0425—Electrodes, e.g. characterised by the structure
- H01S5/04254—Electrodes, e.g. characterised by the structure characterised by the shape
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- 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
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2009—Confining in the direction perpendicular to the layer structure by using electron barrier layers
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- 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
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2018—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers
- H01S5/2027—Reflecting region or layer, parallel to the active layer, e.g. to modify propagation of the mode in the laser or to influence transverse modes
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- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
- H01S5/2201—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure in a specific crystallographic orientation
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- 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
- H01S5/32025—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 non-polar orientation
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- 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
Definitions
- the present invention relates to a semiconductor element and a manufacturing method thereof, and more particularly to a semiconductor element including a semiconductor element portion including a plurality of directions having different thermal expansion coefficients in an in-plane direction of a main surface and a manufacturing method thereof.
- a semiconductor light emitting element including a Ga N-based semiconductor multilayer structure (semiconductor element part) including a plurality of directions having different thermal expansion coefficients in the in-plane direction of the main surface is disclosed in Japanese Patent Application Laid-Open No. 2001-7394. It is disclosed in the gazette.
- a conventional semiconductor light emitting device disclosed in Japanese Patent Application Laid-Open No. 2001-7394 is obtained by laminating a GaN-based semiconductor multilayer structure on a single crystal substrate having a (1-100) plane as a main surface. -A GaN-based semiconductor multilayer structure with the (100) plane as the main surface is formed.
- the thermal expansion coefficient of a GaN-based semiconductor multilayer structure having a main surface other than the (0001) plane has anisotropy in the in-plane direction of the main surface.
- the thermal expansion coefficient in the c-axis direction that is the [0001] direction is different from the thermal expansion coefficient in the a-axis direction that is the [11 20] direction.
- the GaN-based semiconductor multilayer structure is bonded to a substrate having an isotropic thermal expansion coefficient in the in-plane direction of the main surface.
- the substrate having an isotropic thermal expansion coefficient in the in-plane direction of the main surface is anisotropic in the in-plane direction of the main surface. Since the GaN-based semiconductor multilayer structure having a typical thermal expansion coefficient is bonded, it is difficult to reduce the difference in thermal expansion coefficient between the substrate and the GaN-based semiconductor multilayer structure in each direction within the bonding surface. There is an inconvenience of becoming. Therefore, the GaN-based semiconductor multilayer structure is distorted due to the difference between the temperature at which the GaN-based semiconductor multilayer structure is bonded to the substrate and the temperature at which the semiconductor light-emitting element operates. There is a problem that the characteristics deteriorate.
- the present invention has been made to solve the above-described problems, and one object of the present invention includes a plurality of directions in which the semiconductor element portion has different thermal expansion coefficients in the in-plane direction. In some cases, the present invention also provides a semiconductor device capable of suppressing degradation of device characteristics and a method for manufacturing the same.
- a semiconductor element according to a first aspect of the present invention includes a semiconductor element portion having a first surface and a plurality of directions having different thermal expansion coefficients in an in-plane direction of the first surface; And a base including a plurality of directions having different thermal expansion coefficients in the in-plane direction of the second surface, and the first surface of the semiconductor element portion joined to the second surface.
- the semiconductor element relative to the substrate is such that the direction with the largest thermal expansion coefficient on the first surface of the semiconductor element portion is closer to the direction of the largest direction than the direction with the smallest thermal expansion coefficient on the second surface of the substrate.
- the element part is joined.
- a semiconductor element portion including a plurality of directions having different thermal expansion coefficients
- a base including a plurality of directions having different thermal expansion coefficients in the in-plane direction of the second surface, and the direction having the largest thermal expansion coefficient on the first surface of the semiconductor element portion is the second surface of the base.
- the first surface of the semiconductor element portion and the first surface of the substrate are configured by joining the semiconductor element portion to the substrate so as to be closer to the direction of the largest direction than the direction having the smallest thermal expansion coefficient on the surface.
- the difference in thermal expansion coefficient can be reduced in each direction within the surface to which the second surface is bonded, the temperature at which the semiconductor element portion is bonded to the substrate and the temperature at which the semiconductor element operates The first surface of the semiconductor element due to the difference It is possible that distortion is suppressed. As a result, even when the semiconductor element portion includes a plurality of directions having different thermal expansion coefficients in the in-plane direction of the first surface, it is possible to suppress deterioration of the element characteristics of the semiconductor element.
- the direction having the largest thermal expansion coefficient in the in-plane direction of the first surface of the semiconductor element portion is the heat in the in-plane direction of the second surface of the substrate. It substantially coincides with the direction of the largest expansion coefficient.
- the largest thermal expansion coefficient and the smallest thermal expansion coefficient in the in-plane direction of the first surface of the semiconductor element portion are respectively provided.
- the largest thermal expansion coefficient and the smallest thermal expansion coefficient in the in-plane direction of the first surface of the semiconductor element portion are ⁇ and ⁇ , respectively.
- the difference in thermal expansion coefficient corresponding to each direction between the first surface and the second surface of the substrate can be reduced.
- the first surface of the semiconductor element portion has the largest size! /,
- the thermal expansion coefficient and the smallest height, and the thermal expansion coefficient is ⁇ and
- the first surface of the semiconductor element portion is rectangular so that the thermal expansion coefficient in the direction of the long side is ⁇ ,
- the first surface of the semiconductor element portion is formed in a rectangular shape so that the coefficient is ⁇ .
- the direction of the long side and the short side of the first surface is determined on the basis of the magnitude relationship of the difference in thermal expansion coefficient between the semiconductor element portion and the base.
- the direction having the largest thermal expansion coefficient in the in-plane direction of the first surface of the semiconductor element portion and the surface of the first surface of the semiconductor element portion is formed so that it can be distinguished from the direction having the smallest thermal expansion coefficient in the inward direction.
- the shape of the first surface of the semiconductor element portion is formed in a substantially rectangular shape.
- the direction having the largest thermal expansion coefficient and the direction having the smallest thermal expansion coefficient in the in-plane direction of the first surface of the semiconductor element portion can be easily distinguished.
- the direction in which the thermal expansion coefficient is greatest in the in-plane direction of the second surface of the base and the thermal expansion in the in-plane direction of the second surface of the base is formed so that it can be distinguished from the direction with the smallest coefficient.
- the semiconductor element portion includes a semiconductor layer having a first surface and a hexagonal crystal structure or a wurtzite structure, and the first surface is H
- K and K is an integer that is not 0, it is substantially a (HK ⁇ - ⁇ 0) plane.
- the semiconductor element according to the first aspect further includes an adhesive layer for joining the second surface of the substrate and the first surface of the semiconductor element portion.
- both the substrate and the adhesive layer have conductivity.
- the second surface of the conductive substrate and the first surface of the semiconductor element portion can be bonded via the conductive adhesive layer. Can be easily connected electrically.
- the adhesive layer is preferably provided in a region separated from the resonator surface of the semiconductor element portion by a predetermined distance in the direction in which the resonator extends. If comprised in this way, the area
- the adhesive layer and the substrate are provided adjacent to the end of the resonator surface on the substrate side, it is possible to cleave the semiconductor element portion that is not affected by the cleavage property on the substrate side.
- the Young's modulus of the substrate is preferably configured to be smaller than the Young's modulus of the semiconductor element portion. With this configuration, since the Young's modulus of the substrate is smaller than the Young's modulus of the semiconductor element portion, it is possible to further suppress the occurrence of distortion on the first surface of the semiconductor element portion.
- the semiconductor element part is a semiconductor light emitting element part including a light emitting layer.
- the base is a submount.
- a method of manufacturing a semiconductor device includes a semiconductor device having a first surface and a plurality of directions having different thermal expansion coefficients in the in-plane direction of the first surface. Forming a portion and a second surface of the substrate including a plurality of directions having a second surface and having different thermal expansion coefficients in the in-plane direction of the second surface. Bonding the first surface of the semiconductor element portion so that the direction with the largest thermal expansion coefficient is closer to the direction of the second surface than the direction with the smallest thermal expansion coefficient.
- the first surface is provided on the base including a plurality of directions having different thermal expansion coefficients in the in-plane direction of the second surface.
- the semiconductor device includes a plurality of directions having different thermal expansion coefficients in the in-plane direction of the first surface on the surface of the growth substrate including a plurality of directions having different thermal expansion coefficients in the in-plane direction.
- a step of growing a semiconductor element portion including the same.
- the step of bonding the first surface of the semiconductor element portion to the second surface of the substrate is a step of forming the semiconductor element portion.
- a step of bonding the semiconductor element portion side formed on the growth substrate so as to face the substrate, and after the step of bonding the first surface of the semiconductor element portion to the second surface of the substrate, the growth substrate is a support substrate.
- the largest thermal expansion coefficient and the smallest thermal expansion coefficient in the first surface of the semiconductor element part are ⁇ and ⁇ , respectively.
- the process of forming the semiconductor element section is I ⁇ ⁇ ⁇
- the first surface of the semiconductor element is formed in a rectangular shape so that the thermal expansion coefficient in the direction of the side is ⁇ .
- the direction of the long side and the short side of the first surface is changed based on the magnitude relationship between the differences in the thermal expansion coefficients of the semiconductor element portion and the base in each direction. Since a semiconductor element part having a rectangular shape aligned with the substrate side can be formed, distortion is more likely to occur than in the short side direction of the semiconductor element part! / Distortion occurs in the long side direction. It is possible to obtain a semiconductor element in which is effectively suppressed.
- the largest thermal expansion coefficient and the smallest thermal expansion coefficient on the first surface of the semiconductor element part are ⁇ and ⁇ , respectively.
- the step of joining the first surface of the element portion is performed by at least ⁇ ⁇ a> a or ⁇ > a ⁇ a or a ⁇ a between the thermal expansion coefficients of the substrate and the semiconductor element portion in each direction.
- FIG. 1 is a plan view for explaining the concept of the present invention.
- FIG. 2 is a cross-sectional view taken along line 1000-1000 in FIG.
- FIG. 3 is a plan view showing the structure of the semiconductor laser device according to the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view taken along the line 2000-2000 in FIG.
- FIG. 5 is a cross-sectional view taken along line 3000-3000 in FIG.
- FIG. 6 is a cross-sectional view showing the structure of the light emitting layer of the semiconductor laser device according to the embodiment shown in FIG.
- FIG. 7 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 8 is a cross-sectional view for explaining the manufacturing process for the semiconductor laser device according to the first embodiment of the present invention.
- FIG. 9 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 10 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 11 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 12 is a plan view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the present invention.
- FIG. 13 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 14 is a cross sectional view for illustrating the manufacturing process for the semiconductor laser device according to the first embodiment of the invention.
- FIG. 15 illustrates a manufacturing process for the semiconductor laser device according to the first embodiment of the present invention.
- FIG. 16 is a plan view showing the structure of a GaN-based semiconductor laser device according to a second embodiment of the invention.
- FIG. 17 is a cross-sectional view taken along line 4000-4000 in FIG.
- FIG. 18 is a plan view showing the structure of a light-emitting diode device according to a third embodiment of the invention.
- FIG. 19 is a cross-sectional view showing the structure of a light-emitting diode device according to a third embodiment of the invention.
- FIG. 20 is a plan view showing the structure of a GaN-based semiconductor laser device according to a fourth embodiment of the invention.
- FIG. 21 is a cross-sectional view taken along the 5000-5000 spring in FIG.
- FIG. 1 and FIG. 2 the concept of the present invention will be described before describing specific embodiments of the present invention.
- the semiconductor element of the present invention includes a base body 1 and a semiconductor element portion 2 bonded to the base body 1.
- the substrate 1 of the semiconductor element may be a submount or a support substrate.
- the substrate 1 includes a plurality of directions having different thermal expansion coefficients in the in-plane direction of the main surface la joined to the semiconductor element portion 2. Specifically, for example, as shown in FIG. 2, it has the largest thermal expansion coefficient ⁇ in the direction of arrow A and the smallest thermal expansion coefficient in the direction of arrow ⁇ .
- the principal surface la is an example of the “second surface” in the present invention.
- the substrate 1 having a different thermal expansion coefficient depending on the in-plane direction in the case of a single crystal material, orthorhombic, tetragonal, hexagonal, rhombohedral, monoclinic and triclinic crystals other than cubic crystals are used.
- a material having a structure can be used. These materials having a crystal structure other than a cubic crystal generally have anisotropy in thermal expansion coefficient due to crystal symmetry. A material having such a crystal structure other than cubic is processed so that the anisotropy of the thermal expansion coefficient appears in the in-plane direction of the main surface la.
- a material having a tetragonal and hexagonal crystal structure is processed so that the surface other than the surface perpendicular to the c-axis becomes the main surface la.
- single crystal materials include hexagonal or rhombohedral ⁇ -SiC, wurtzite GaN and A1N nitride semiconductors, wurtzite ZnO and Zn S, hexagonal Using ZrB, HfB, etc. Hexagonal single crystal
- the main surface la is a (HK ⁇ — KU surface other than the (0001) surface, for example, the U— 100 ⁇ surface, the ⁇ 11 20 ⁇ surface, the ⁇ 11 22 ⁇ surface, or the ⁇ 1 ⁇ 101 ⁇ surface. Is formed to be
- the thermal expansion coefficient is obtained by orienting crystals having anisotropy in the thermal expansion coefficient.
- a material having anisotropy may be used. Examples of such a material include polycrystalline A1N in which the c-axis direction of A1N particles is oriented, and a carbon and metal composite material having a sintered compact of graphite particles impregnated with metal. Such a material is formed so that the direction in which the particles are oriented and the direction perpendicular to the direction in which the particles are oriented appear in the plane of the main surface la.
- the appearance of the main surface la of the substrate 1 is such that the direction of the largest thermal expansion coefficient and the direction of the smallest thermal expansion coefficient in the in-plane direction of the main surface la before the semiconductor element portion 2 is joined. It is preferable to be formed so that it can be distinguished. For example, a mark capable of recognizing the direction having the largest thermal expansion coefficient may be formed on the surface of the substrate 1. When an electrode is formed on the substrate 1, the thermal expansion may be performed depending on the shape and arrangement of the electrode. The direction with the largest coefficient may be recognized.
- the electrode in order to recognize the direction with the largest thermal expansion coefficient, the electrode is formed in a two-fold rotationally symmetrical rectangular shape in which the direction of the long side or the short side coincides with the direction with the largest thermal expansion coefficient.
- two-fold rotational symmetry means that there is a two-fold rotational position during rotation from 0 degrees to 360 degrees, and the rectangle corresponds to the two rotational symmetry.
- a shape other than a rectangle may be used as long as it has a low symmetry such as two or one rotation symmetry.
- the outer shape of the substrate 1 may be formed so that the direction having the largest thermal expansion coefficient can be recognized.
- the base body 1 when the base body 1 is a submount, the main surface la of the base body 1 is formed into a two-fold rotationally symmetrical rectangular shape in which the direction of the long side or the short side coincides with the direction having the largest thermal expansion coefficient.
- the substrate 1 when the substrate 1 is a support substrate, the orientation of the substrate 1 You can make a flat!
- the semiconductor element portion 2 is bonded to the base body 1 via an adhesive layer! /, Or may be! /, And the semiconductor element portion 2 may be directly bonded! / Yo! /
- the main surface 2a bonded to the base body 1 has anisotropy in the thermal expansion coefficient in the in-plane direction. For example, as shown in FIG. 2, it has the largest thermal expansion coefficient ⁇ in the arrow C direction and the smallest thermal expansion coefficient ⁇ in the arrow D direction.
- the semiconductor element portion 2 includes a semiconductor having an orthorhombic, tetragonal, hexagonal, rhombohedral, monoclinic and triclinic crystal structure other than cubic.
- the plane orientation of the main surface 2a is selected so that the anisotropy of the thermal expansion coefficient appears in the in-plane direction of the main surface 2a.
- the main surface 2a is a (HKH-KL) plane other than the (00 01) plane, for example, ⁇ 1-100 ⁇ plane, ⁇ 11-20 ⁇ plane , ⁇ 11 — 22 ⁇ plane, or ⁇ 1 ⁇ 101 ⁇ plane.
- the principal surface 2a is an example of the “first surface” of the present invention.
- Examples of the semiconductor of the semiconductor element portion 2 include GaN A1N InN BN and T1N having a wurtzite structure, or nitride-based semiconductors including these mixed crystals, ⁇ -SiC, and a wurtzite structure. ZnO, ZnS, etc. having the following can be used.
- the direction with the largest thermal expansion coefficient in the surface is [K — ⁇ ⁇ — ⁇ 0] direction
- the thermal expansion coefficient is in-plane.
- the largest direction is the [ ⁇ — ⁇ ⁇ — ⁇ 0] direction
- the direction with the smallest coefficient of thermal expansion is the [0001] direction.
- the appearance of the main surface 2a of the semiconductor element portion 2 is such that, before being bonded to the substrate 1, the direction with the largest thermal expansion coefficient and the direction with the smallest thermal expansion coefficient in the in-plane direction of the main surface 2a. It is preferable to be formed so that it can be distinguished.
- a mark capable of recognizing the direction with the largest thermal expansion coefficient may be formed on the surface of the semiconductor element portion 2, or when an electrode is formed on the semiconductor element portion 2, depending on the shape and arrangement of the electrodes.
- the direction with the largest thermal expansion coefficient may be recognized.
- long side or short side The electrode may be formed in a two-fold rotationally symmetric rectangular shape in which the direction is aligned with the direction having the largest thermal expansion coefficient.
- the outer shape of the semiconductor element portion 2 may be formed so that the direction having the largest thermal expansion coefficient can be recognized. That is, the main surface 2a of the semiconductor element portion 2 may be formed in a two-fold rotationally symmetrical rectangular shape in which the direction of the long side or the short side coincides with the direction having the largest thermal expansion coefficient.
- the direction with the largest thermal expansion coefficient may be recognized by the direction in which the waveguide of the semiconductor laser element extends.
- the semiconductor element portion 2 includes a substrate! /!
- the semiconductor element portion 2 may include a stacked structure of a p-type layer and an n-type layer.
- the semiconductor element portion 2 may include a light emitting layer between the p-type layer and the n-type layer, and the light emitting layer may be undoped.
- the light emitting layer may be a single layer, a single quantum well (SQW) structure, or a multiple quantum well (MQW) structure! /.
- strain may be applied to the light emitting layer.
- the light emitting layer has a Wurtzite structure, and the main surface of the light emitting layer is other than the (0001) surface (HK ⁇ —KU surface, for example, ⁇ 1—100 ⁇ surface, ⁇ 11 20 ⁇ surface, It is possible to reduce the piezo electric field generated in the light emitting layer by forming the ⁇ 11 22 ⁇ plane or the ⁇ 1-101 ⁇ plane, so that the luminous efficiency can be improved.
- GalnN can be used as the material of the light emitting layer.
- the p-type layer and the n-type layer may include a clad layer having a band gap larger than that of the active layer.
- an optical guide layer having a band gap smaller than the band gap of the cladding layer and larger than the band gap of the active layer may be formed between the cladding layer and the active layer.
- a contact layer may be formed on the clad layer on the side opposite to the active layer. The contact layer preferably has a smaller band gap than the cladding layer.
- GaN and AlGaN can be used as the material of the cladding layer.
- the direction of the largest thermal expansion coefficient ( ⁇ ) of the main surface 2a of the substrate 1 is the smallest heat of the main surface la of the substrate 1 in which the semiconductor element portion 2 is on the substrate 1 Expansion coefficient
- the coefficient of thermal expansion is larger than the direction of). . More preferably, as shown in FIG. 2, the direction of the largest thermal expansion coefficient ( ⁇ ) of the principal surface 2a of the semiconductor element portion 2 (direction of arrow C) is the largest coefficient of thermal expansion of the principal surface la of the substrate 1. )
- the semiconductor element portion 2 is bonded to the base 1 so as to substantially coincide with the direction (arrow A direction).
- the force S can be further reduced by reducing the difference in thermal expansion coefficient between the substrate 1 and the semiconductor element section 2 (main surface la and main surface 2a).
- the effect of the present invention is also obtained when the thermal expansion coefficient in each direction between the substrate 1 and the semiconductor element portion 2 is ⁇ > a ⁇ a> a or ⁇ > a ⁇ a> a.
- Semiconductor element 2 is formed in a rectangular shape or I ⁇ — ⁇
- the semiconductor element part 2 is formed in a rectangular shape so that the thermal expansion coefficient in the long side direction is ⁇ .
- the semiconductor laser device according to the first embodiment includes a semiconductor element portion 10, a support substrate 30, and a submount 40 as a heat dissipation member.
- the support substrate 30 and the submount 40 are examples of the “base” of the present invention.
- the semiconductor element portion 10 is made of a nitride-based semiconductor having a wurtzite structure. As shown in FIG. 5, this semiconductor element portion 10 has one main surface (semiconductor element portion 10 having a substantially (11 20) plane that is off (tilted) by about 0.3 ° in the [000-1] direction. The entire upper surface of the p-type contact layer 17 side) 10a and the other main surface (the back surface of the n- type contact layer 11) 10b. Further, as shown in FIGS. 3 and 4, the semiconductor element portion 10 is formed with a pair of resonator surfaces 50 formed of cleavage planes.
- the resonator surface 50 is composed of a (1-100) surface and a (1100) surface.
- a dielectric multilayer film having a reflectivity of about 5% is formed on the resonator surface 50 on the laser beam emission surface side, and a reflectivity of about 95% is formed on the resonator surface 50 on the opposite side.
- a dielectric multilayer film is formed.
- the length (resonator length) L1 of the semiconductor element portion 10 is about 600 m, and the width W1 is about 400 m.
- the semiconductor element portion 10 is bonded to the support substrate 30 via a solder layer 23 described later.
- the one main surface 10a and the other main surface 10b are examples of the “first surface” of the present invention, and the solder layer 23 is an example of the “adhesive layer” of the present invention.
- the semiconductor element portion 10 includes an n-type contact layer 11 made of GaN having a thickness of about 5111. On the upper surface of the n-type contact layer 11, an n-type cladding layer having a thickness of about 40 Onm and made of AlGaN doped with Si
- a light emitting layer 13 having a width of about 4.5 m is formed which is smaller than the width W1 of the semiconductor element portion 10 (see FIG. 5).
- the light emitting layer 13 has an n-type carrier block layer 13 made of AlGaN doped with Si and having a thickness of about 5 nm on the upper surface of the n-type cladding layer 12.
- n-type carrier block layer 13a On the upper surface of the n-type carrier block layer 13a, an n-type light guide layer 13b made of GaN doped with Si having a thickness of about lOOnm is formed. On the upper surface of the n-type optical guide layer 13b, undoped InGaN having a thickness of about 20 nm is formed.
- It consists of four barrier layers 13c of 0.02 and 98 and undoped InGaN having a thickness of about 3 nm.
- a p-type light guide layer 14 made of GaN doped with Mg having a thickness of about 10 nm is formed on the upper surface of the light emitting layer 13, as shown in FIGS. 4 and 5, a p-type light guide layer 14 made of GaN doped with Mg having a thickness of about 10 nm is formed. .
- A1 has a thickness of about 20 nm and is doped with Mg.
- a p-type cap layer 15 made of GaN is formed. On top of p-type cap layer 15
- a p-type cladding layer 16 of 0.0.07.93 is formed.
- the film thickness of the convex part of the p-type cladding layer 16 is about 400 nm, and the film thickness of the flat part other than the convex part of the p-type cladding layer 16 is about 80 nm.
- a p-type contact layer 17 made of InGaN doped with Mg and having a thickness of about 10 nm is formed on the upper surface of the convex portion of the p-type cladding layer 16. This allows p-type
- a ridge portion 18 serving as a current path is formed by the convex portion of the ladder layer 16 and the p-type contact layer 17.
- the ridge portion 18 has a width of about 1.5 m and a height of about 380 nm.
- the ridge portion 18 is formed to extend in the [1-100] direction.
- a p-side ohmic electrode 19 composed of the layers is formed.
- a p-side pad electrode 21 composed of an Au layer having s is formed.
- the p-side pad electrode 21 has a width W2 (see FIG. 5) of about 125 m.
- an insulating film 22 having a thickness of about lOOnm and having an SiO force is formed.
- a conductive solder layer 23 made of Au Sn is formed on the upper surface of the insulating film 20 so as to cover the p-side pad electrode 21 and the insulating film 22.
- the insulating film 22 has a function of suppressing the reaction between the solder layer 23 and the p-side ohmic electrode 19.
- the support of the resonator surface 50 of the semiconductor element unit 10 is supported.
- a void portion 60 that is a region where the solder layer 23 does not exist is formed in the vicinity of the end portion on the holding substrate 30 side.
- the gap 60 which is a region where the solder layer 23 does not exist, is formed from the resonator surface 50 to a region separated from the resonator surface 50 by an interval (L2) of about 25 m.
- the side end surface of the support substrate 30 is formed at a position displaced by a length (L3) of about 20 m inward from the resonator surface 50 by dicing at the time of element division described later.
- the semiconductor element portion 10 is configured to have a thermal expansion coefficient force close to that of GaN because the ratio of GaN is the largest. For this reason, GaN has a thermal expansion coefficient of about 5.59 X 10—6K— 1 , which is the largest in the [1 100] direction, and the smallest in the [0001] direction within the (11 20) plane. 3 ⁇ WX ICT 6 ! ⁇ 1 thermal expansion coefficient. Therefore, the semiconductor element portion 10 has a maximum of about 5.59 X in the [1-100] direction in the in-plane direction of the one main surface 10a and the other main surface 10b having substantially the (11 20) plane. 10— — It has a coefficient of thermal expansion in the vicinity of 1, and has a coefficient of thermal expansion in the vicinity of 3.17 X IO ⁇ K— 1, which is the smallest in the [0001] direction.
- the support substrate 30 is made of n-type 6H SiC doped with nitrogen.
- the support substrate 30 has a main surface 30a having a (1-100) surface.
- the support substrate 30 is, in the in-plane direction of the main surface 30a having a (1 100) plane, from about 4. 7 X 10- most large [0001] direction - which has a first thermal expansion coefficient, [ It has a thermal expansion coefficient of about 4.3 X 10— — 1 , which is the smallest in the direction of 11-20.
- the [0001] direction of the support substrate 30 coincides with the [1-100] direction of the semiconductor element portion 10, and the [11 20] direction of the support substrate 30 is the semiconductor element.
- One main surface 10 a of the semiconductor element portion 10 is bonded via the solder layer 23 so as to substantially match the [0001] direction of the portion 10.
- the principal surface 30a is an example of the “second surface” in the present invention.
- the n-side ohmic electrode and the n-side barrier are sequentially formed from the n-type contact layer 11 side.
- An n-side electrode 24 composed of a metal and an n-side pad electrode is formed.
- the n-side ohmic electrode constituting the n-side electrode 24 is A, and the n-side barrier metal is made of Pt or Ti.
- the n-side barrier metal has a function of suppressing the reaction between the n-side ohmic electrode and the n-side pad electrode.
- the submount 40 is made of a composite material of carbon and metal constituted by a graphite particle sintered body impregnated with A1.
- the submount 40 is a rectangular parallelepiped having a thickness of about 300 m, a length L4 of about 1200 m, and a width W3 of about 800 m.
- the submount 40 has conductivity and a main surface 40a. Further, the length direction (long side direction) of the submount 40 is parallel to the arrow E direction, and the width direction (short side direction) is parallel to the arrow F direction.
- the submount 40 has a thermal expansion coefficient of about 7 X 10— — 1 which is the largest in the direction perpendicular to the graphite crystal plane (in the direction of arrow E) in the in-plane direction of the main surface 40a.
- the coefficient of thermal expansion is about 4 X ICT 6 ! ⁇ 1 which is the smallest in the direction parallel to (arrow F direction).
- the Young's modulus of this submount 40 is a directional force S6GPa perpendicular to the graphite crystal plane, and the direction parallel to the graphite crystal plane is 17 GPa. Therefore, the Young's modulus of the submount 40 is configured to be smaller than the Young's modulus of the semiconductor element portion 10.
- the [1 100] direction of the semiconductor element portion 10 coincides with the arrow E direction
- the [0001] direction of the semiconductor element portion 10 substantially coincides with the arrow F direction.
- the other main surface 10 b of the semiconductor element portion 10 is joined via the solder layer 70.
- the solder layer 70 is an example of the “adhesive layer” of the present invention.
- the semiconductor element portion 10 together with one of the thermal expansion coefficient, the smallest about 4 X 10- 6 K in the direction of arrow F - - largest about 7 X 10- direction provided a submount 40 having a first thermal expansion coefficient, and the semiconductor
- the other main surface of the semiconductor element portion 10 so that the [1-100] direction of the element portion 10 coincides with the arrow ⁇ direction and the [0001] direction of the semiconductor element portion 10 substantially coincides with the arrow F direction.
- 10b is bonded to the main surface 40a of the submount 40 via the solder layer 70, thereby providing a semiconductor element.
- the semiconductor element part 10 Since the direction having the largest thermal expansion coefficient of the other principal surface 10b of the child part 10 can be matched with the direction having the largest thermal expansion coefficient of the principal surface 40a of the submount 40, the semiconductor element part 10 On the other hand, it is possible to reduce the difference in thermal expansion coefficient between the main surface 10b and the main surface 40a of the submount 40. As a result, distortion occurs on the other main surface 10b of the semiconductor element portion 10 due to the difference between the temperature at which the semiconductor element portion 10 is bonded to the submount 40 and the temperature at which the semiconductor laser element operates. Can be suppressed. As a result, it is possible to suppress degradation of the element characteristics of the semiconductor laser element. Further, in the first embodiment, since the Young's modulus of the submount 40 is smaller than the Young's modulus of the semiconductor element unit 10, the occurrence of distortion on the other main surface 10b of the semiconductor element unit 10 is further suppressed. can do.
- the thermal expansion coefficient of about 4.7 X 10- eK- 1 is the largest in the [0 001] direction in the in-plane direction of the main surface 30a having the (1-100) plane.
- the thermal expansion coefficient of about 4.3 X 10— — 1 which is the smallest in the [11-20] direction in the largest of about 5.
- 59 X 10- [1 100] direction - which has a first thermal expansion coefficient in the vicinity of, the smallest about 3.
- the semiconductor element portion 10 is provided, and the [1-100] direction of the semiconductor element portion 10 coincides with the [0001] direction of the support substrate 30, and the [0001] direction of the semiconductor element portion 10 is the support substrate 30.
- the one main surface 10a of the semiconductor element portion 10 is joined to the main surface 30a of the support substrate 30 via the solder layer 23 so as to substantially match the [11 20] direction of The direction in which the one main surface 10a of the semiconductor element portion 10 has the largest thermal expansion coefficient can be matched with the direction in which the main surface 30a of the support substrate 30 has the largest thermal expansion coefficient, so that the semiconductor element portion
- the difference in thermal expansion coefficient between the one main surface 10a of 10 and the main surface 30a of the support substrate 30 can be reduced.
- distortion occurs on the one main surface 10a of the semiconductor element portion 10.
- the heat in the [1 100] direction which is the long side direction of the semiconductor element portion 10 is also provided.
- the difference between the thermal expansion coefficient in the [0001] direction of the support substrate 30 and the thermal expansion coefficient in the [0001] direction, which is the short side direction of the semiconductor element portion 10, and the [11-20] direction of the support substrate 30 By making it smaller than the difference from the coefficient of thermal expansion, the distortion in the long side direction (length direction) is more likely to occur than in the short side direction (width direction) of the semiconductor element portion 10 of the semiconductor element portion 10. It is possible to effectively suppress the occurrence.
- the presence of the solder layer 23 is configured by having the void portion 60 which is a region where the solder layer 23 for joining the support substrate 30 and the semiconductor element portion 10 does not exist. Due to the gap 60 that is not a region, it is possible to form a region in which the support substrate 30 and the semiconductor element unit 10 are separated from each other in the vicinity of the end of the resonator surface 50 of the semiconductor element unit 10 on the support substrate 30 side. .
- the semiconductor element portion is not affected by the cleavage of the support substrate 30. 10 can be cleaved. Therefore, even when the (0001) plane parallel to the resonator surface 50 of the support substrate 30 made of 6H—SiC does not have the cleavage property, the flatness of the cleavage surface of the semiconductor element portion 10 can be improved.
- the support substrate 30 and the solder layer 23 are configured to have conductivity, whereby the support substrate 30 having conductivity is interposed via the solder layer 23 having conductivity. Since the main surface 30a of the semiconductor element 10 and the one main surface 10a of the semiconductor element portion 10 can be joined, the semiconductor element portion 10 and the support substrate 30 can be electrically connected.
- the semiconductor element portion 10 is configured to be a semiconductor light emitting element portion including the light emitting layer 13, so that the semiconductor element portion 10 is formed on the one main surface 10a and the other main surface 10b. Both are bonded to the support substrate 30 side and the submount 40 side in a state in which distortion is suppressed, so that it is possible to easily suppress the deterioration of the element characteristics of the light emitting element part (semiconductor element part 10). can do.
- FIGS. 7 to 11 show cross-sectional views in the same direction as FIG. 5
- FIGS. 13 to 15 show cross-sectional views in the same direction as FIG.
- a mask 72 is formed on the upper surface of the GaN substrate 71 whose main surface is the (11 20) plane that is off (tilted) by 0.3 ° in the [000-1] direction.
- the opening 72a having a diameter of about 2 mm is formed so as to have a triangular lattice pattern with a period of about 10 mm.
- the GaN substrate 71 and the mask 72 constitute a selective growth base 73.
- the GaN substrate 71 is an example of the “growth substrate” in the present invention.
- the n-type contact layer is formed on the top surface of the selective growth base 73 while the GaN substrate 71 is maintained at a growth temperature of about 1100 ° C. 1 1 and n-type cladding layer 12 are grown sequentially.
- the GaN substrate 71 maintained at a growth temperature of about 800 ° C.
- the light emitting layer 13, the p-type light guide layer 14, and the p-type cap layer 15 are sequentially grown on the upper surface of the n-type cladding layer 12. .
- a p-type cladding layer 16 having a thickness of about 400 nm is grown on the upper surface of the p-type cap layer 15 while the GaN substrate 71 is maintained at a growth temperature of about 1100 ° C.
- the p-type contact layer 17 is grown on the upper surface of the p-type cladding layer 16 with the GaN substrate 71 maintained at a growth temperature of about 800 ° C.
- annealing is performed in an N atmosphere with the GaN substrate 71 held at a temperature of about 900 ° C.
- the receptor of the p-type nitride semiconductor layer is activated to obtain a predetermined hole concentration.
- the p-side ohmic electrode 19 and the insulating film 20a having a thickness of about 0.25 111 and having a force of 310 are sequentially formed on the upper surface of the p-type contact layer 17 by using a vacuum deposition method or the like.
- the p-side ohmic electrode 19 and the insulating film 20a having the shapes shown in FIG. 8 are obtained.
- the p-side ohmic electrode 19 includes a Pt layer having a thickness of about 5 ⁇ m, a Pd layer having a thickness of about 100 ⁇ m, and an Au layer having a thickness of about 150 nm from the p-type contact layer 17 side. And are stacked.
- the ridge portion 18 By removing the p-type contact layer 17 and a part of the p-type cladding layer 16, the ridge portion 18 extending in the [1-100] direction is formed.
- the width of the ridge portion 18 is about 1.5 m, and the height of the ridge portion 18 is about 380 nm.
- one of the flat portions of the light emitting layer 13, the p-type light guide layer 14, the p-type cap layer 15, and the p-type cladding layer 16 is provided.
- the light emitting layer 13, the p-type light guide layer 14, the p-type cap layer 15 and the p-type cladding layer 16 are patterned so as to have a width of about 4.5 am.
- the upper surface of the n-type cladding layer 12 After forming the insulating film 20 made of SiN having a thickness of about 250 nm so as to cover the side surface of the flat portion, the upper surface of the flat portion of the p-type cladding layer 16, the side surface of the ridge portion 18 and the upper surface of the insulating film 20a, Only the insulating films 20 and 20a on the p-side ohmic electrode 19 are removed.
- the solder layer 23 is patterned on the main surface 30a of the support substrate 30 in advance in a stripe shape extending in the [11-20] direction. Then, a semiconductor pattern is formed on the support substrate 30 such that the striped pattern of the solder layer 23 extending in the [11 20] direction of the support substrate 30 and the ridge portion 18 extending in the [1 100] direction of the semiconductor element portion 10 are orthogonal to each other. The element part 10 is bonded together. As a result, the [0001] direction of the support substrate 30 coincides with the [1-100] direction of the semiconductor element portion 10, and the [11-20] direction of the support substrate 30 substantially matches the [0001] direction of the semiconductor element portion 10.
- the main surface 10a of the semiconductor element portion 10 is bonded to the main surface 30a of the support substrate 30 via the solder layer 23 so as to coincide with each other. Further, when the semiconductor element portion 10 and the support substrate 30 are joined (fused), as shown in FIG. 13, the joining is performed so that there is a void portion 60 that is a region where the solder layer 23 does not exist. Thereafter, the selective growth base 73 is removed by a dry etching technique, and the entire surface of the n-type contact layer 11 opposite to the support substrate 30 is exposed to obtain a shape as shown in FIG.
- the support substrate 30 and the semiconductor element portion 10 are formed using the solder layer 23 patterned in a stripe pattern on the support substrate 30 and the ridge portion 18 of the semiconductor element portion 10.
- Alignment force at the time of bonding S orientation flats are formed on the support substrate 30 and the selective growth base 73, and alignment is performed so that the orientation flats match. You may do it.
- the (1-100) plane orientation flat is formed on the selective growth base 73
- the (0001) plane orientation flat is formed on the support substrate 30 (1) of the selective growth base 73 (1).
- the alignment may be performed so that the (100) plane and the (0001) plane of the support substrate 30 are aligned.
- the n-side electrode 24 is formed on the back surface of the n-type contact layer 11 by sequentially forming an n-side ohmic electrode, an n-side barrier metal, and an n-side pad electrode from the n-type contact layer 11 side.
- a scribe groove (not shown) is provided on the surface of the semiconductor element portion 10 perpendicular to the main surface 30a of the support substrate 30, and ultrasonic waves are used. Cleavage is performed on the (1-100) plane of the semiconductor element 10.
- the cleavage of the semiconductor element portion 10 is performed at the position of the gap portion 60, which is a region where the solder layer 23 does not exist in the vicinity of the end portion on the support substrate 30 side of the region serving as the cleavage plane. It is performed along the cleavage plane of the semiconductor element section 10. Thereafter, only the support substrate 30 is diced with a width (L5) of about 40 m, whereby the element division of the semiconductor element portion 10 is performed.
- the second embodiment unlike the first embodiment, a GaN-based semiconductor laser device having a structure that does not use a supporting substrate will be described.
- a case where the present invention is applied to a GaN-based semiconductor laser element which is an example of a semiconductor element will be described.
- the oscillation wavelength of the GaN-based semiconductor laser device according to the second embodiment is about 410 nm.
- the GaN semiconductor laser device includes a semiconductor device portion 110 and a submount 140.
- the submount 140 is an example of the “base” in the present invention.
- the semiconductor element portion 110 includes an n-type GaN substrate 130 having a thickness of about 100 in and made of n-type GaN doped with Si.
- the n-type GaN substrate 130 has a main surface 130a having a (11-22) plane. Further, at both end portions of the n-type GaN substrate 130, a step portion 131 is formed which extends in the [1100] direction and has a depth of about 0.5 m and a width of about 20 m.
- an n-type cladding layer 111 having a thickness of about 400 nm and made of Si-type S-doped n-type AlGaN is formed.
- An active layer 112 is formed on the surface of the n-type cladding layer 111 on the submount 140 side.
- This active layer 112 is made of undoped InGaN having a thickness of about 20 nm.
- the active layer 112 is an example of the “light emitting layer” in the present invention.
- a p-type cap layer 113 made of p-type AlGaN doped with Mg and having a thickness of about 20 nm is formed.
- a p-type cladding layer 1 having a convex portion and a flat portion other than the convex portion and made of Mg-doped p-type Al Ga N 1
- the flat portion of the p-type cladding layer 114 has a thickness of about 10 nm, and the convex portion has a thickness of about 330 nm.
- the convex portion of the p-type cladding layer 114 has a width of about 1 ⁇ 75 mm, and is about 50 m from the side surface of one step portion 131 of the n-type GaN substrate 130 to the center side (W4 in FIG. 17). ) Formed apart! /
- a p-type contact layer 115 having a thickness of about 80 nm and made of p-type InGaN doped with Mg is formed on the upper surface of the convex portion of the p-type cladding layer 114. . This p
- a ridge portion 116 is constituted by the type contact layer 115 and the convex portion of the p-type cladding layer 114.
- the ridge portion 116 is formed to extend in the [1-100] direction.
- a P-side ohmic electrode 117 composed of a Pd layer having a thickness of about lOOnm and an Au layer having a thickness of about 150 nm.
- p-side ohmic electrode 117 On the surface of the region other than the surface on the submount 140 side, a current confinement layer 118 made of a SiO 2 film (insulating film) having a thickness of about 250 nm is formed. Current confinement layer 118 surface
- a Ti layer having a thickness of about lOOnm from the opposite side of the submount 140 toward the submount 140 so as to contact the surface of the p-type ohmic electrode 117 on the submount 140 side, and about A p-side pad electrode 119 is formed with a Pd layer having a thickness of lOOnm, an Au layer having a thickness of about 3 m, and a force.
- an n-side electrode 120 constituted by an n-side ohmic electrode, an n-side barrier metal, and an n-side pad electrode 120. Is formed.
- a resonator surface 110a composed of a (1-100) plane and a (-1100) plane is formed at both ends of the ridge portion 116 extending in the [1100] direction.
- the semiconductor element portion 110 has a main surface having a (112) plane (the entire surface on the p-type contact layer 115 side of the semiconductor element portion 110) in the in-plane direction of 110b. most size / the [1 100] direction, which is the long side direction, about 5. 59 X 10- -! and having a first thermal expansion coefficient in the vicinity of a short side direction [1 100] direction perpendicular It is configured to have a coefficient of thermal expansion of about 4 X 10— — 1, which is the smallest in the direction.
- the main surface 110b is an example of the “first surface” in the present invention.
- the submount 140 is made of single crystal A1N having conductivity and having the (11-20) plane as the main surface 140a.
- the submount 140 is a rectangular parallelepiped having a thickness of about 300 111, a length of about 1200 ⁇ m, and a width of about 800 ⁇ m.
- the length direction (long side direction) of the submount 140 is parallel to the [1100] direction, and the width direction (short side direction) is parallel to the [0001] direction.
- the submount 140 has a thermal expansion coefficient of about 4.2 X 10— — 1 that is the smallest in the [1-100] direction and the largest in the [0001] direction in the in-plane direction of the main surface 140a.
- SX IO ⁇ K— Has a coefficient of thermal expansion of 1 .
- the semiconductor element is arranged such that the width direction (short side direction) of the submount 140 and the direction in which the ridge portion 116 of the semiconductor element 110 extends (resonator direction) coincide.
- 110 main surface 110b on the ridge 116 side through a solder layer 150 made of AuSn or the like And it is joined by the junction down method.
- the main surface 110b of the semiconductor element unit 110 is placed on the main surface 140a of the submount 140 so that the [1-100] direction of the semiconductor element unit 110 coincides with the [0001] direction of the submount 140. 150 is joined.
- the main surface 140a is an example of the “second surface” in the present invention
- the solder layer 150 is an example of the “adhesive layer” in the present invention.
- the largest in the [1 100] direction is about 5.59 X 10—eK— 1
- In the in-plane direction of the main surface 140a it has a thermal expansion coefficient of about 4.2 X ICT 6 ! ⁇ 1 that is the smallest in the [1 100] direction, and in the [0001] direction. the largest of about 5.
- the main surface 110b of the semiconductor element part 110 is distorted due to the difference between the temperature at which the semiconductor element part 110 is bonded to the submount 140 and the temperature at the time of operation of the GaN-based semiconductor laser element. Can be suppressed. As a result, it is possible to suppress degradation of the element characteristics of the GaN-based semiconductor laser device.
- the n-type cladding layer 111 is laterally grown by forming the step portions 131 extending in the [1 100] direction at both end portions of the n-type GaN substrate 130. Therefore, the n-type cladding layer 111 made of AlGaN is distorted due to the lattice constant of the n-type cladding layer 111 made of AlGaN being smaller than the lattice constant of the n-type GaN substrate 130 made of GaN. It can suppress that it becomes easy to generate
- the structure of the LED device according to the third embodiment will be described with reference to FIGS.
- the case where the present invention is applied to an LED element which is an example of a semiconductor element will be described.
- the peak wavelength of the light emitting diode device according to the third embodiment is about 480 nm.
- the LED element according to the third embodiment includes a support substrate 200 and an LED element part 210 as shown in FIGS.
- the support substrate 200 is an example of the “base” of the present invention
- the LED element unit 210 is an example of the “semiconductor element unit” of the present invention.
- the support substrate 200 has a thickness of about 300 ⁇ m, and is formed in a square shape having a length of about 400 in on one side when seen in a plan view. Further, the support substrate 200 is made of a composite material of carbon and metal composed of a graphite particle sintered body impregnated with A1. Further, the support substrate 200 has conductivity.
- the plane perpendicular to the graphite crystal plane is the main surface 200a of the support substrate 200
- the arrow G direction is perpendicular to the graphite crystal plane
- the arrow H direction is parallel to the graphite crystal plane. It is processed as follows.
- the support substrate 200 has a thermal expansion coefficient of about 7 X 10— — 1 which is the largest in the direction perpendicular to the graphite crystal plane (the direction of the arrow G) in the in-plane direction of the main surface 200a, and has a graphite crystal plane.
- the coefficient of thermal expansion is about 4 X 10— — 1 , which is the smallest in the direction parallel to the arrow (direction of arrow H).
- MIC30A manufactured by Toyo Tanso Co., Ltd. is used as a composite material of carbon and metal.
- the main surface 200a is an example of the “second surface” in the present invention.
- solder layer 220 made of AuSn having a thickness of about 3 ⁇ m is formed. On the upper surface of the solder layer 220, a p-side pad electrode 222 and a p-side ohmic electrode 222 are formed.
- the solder layer 220 is an example of the “adhesive layer” in the present invention.
- the LED element unit 210 is made of a nitride-based semiconductor having a wurtzite structure.
- the LED element section 210 has a main surface 210a having a substantially (1-100) plane which is turned off (tilted) by about 0.3 ° in the [000-1] direction.
- the LED element section 210 has a thermal expansion coefficient in the vicinity of about 5.59 X 10— — 1, which is the largest in the [11-20] direction in the in-plane direction of the main surface 210a having the (1-100) plane.
- the smallest in the [0001] direction About 3 ⁇ 17 X 10— — Has a coefficient of thermal expansion close to 1 .
- the direction perpendicular to the graphite crystal plane of the support substrate 200 coincides with the [11-20] direction of the LED element part 210, and the support substrate 200
- the main surface 210a of the LED element unit 210 is bonded via the solder layer 220 so that the direction parallel to the graphite crystal plane of the LED (the direction of arrow H) coincides with the [0001] direction of the LED element unit 210.
- the principal surface 210a is an example of the “first surface” in the present invention.
- a p-type contact layer 211 made of GaN having a thickness of about lOOnm and doped with Mg is formed! /.
- Al Ga N having a thickness of about 20 nm and doped with Mg
- a cap layer 212 is formed. On the upper surface of the cap layer 212, a single quantum well emission having a thickness of about 3 nm and made of Si-doped InGaN
- Layer 213 is formed. On the upper surface of the single quantum well light emitting layer 213, an n-type contact layer 214 having a thickness of about 3111 and made of GaN doped with Si is formed.
- an n-side translucent ohmic electrode 223 is formed on the upper surface of the n-type contact layer 214.
- an n-side pad electrode 224 having a diameter of about 125 111 is formed.
- a GaN-based semiconductor laser device having a structure that does not use a support substrate, unlike the first embodiment, will be described.
- a case where the present invention is applied to a GaN-based semiconductor laser element which is an example of a semiconductor element will be described.
- the oscillation wavelength of the GaN-based semiconductor laser device according to the fourth embodiment is about 410 nm.
- the GaN-based semiconductor laser device includes a semiconductor device, a sub, and a mount 340, as shown in FIGS.
- the sub-mount 340 is an example of the “base” in the present invention.
- the semiconductor element part 310 has a thickness of about 100,1 m and is doped with Si.
- N-type GaN substrate 330 made of GaN.
- the n-type GaN substrate 330 has a main surface 330a having a (1-100) plane.
- the ridge portion 316 is formed to extend in the [0001] direction.
- a resonator surface 310a composed of a (0001) plane and a (000-1) plane is formed at both ends of the ridge portion 316 extending in the [0001] direction.
- the length (resonator length) L1 of the semiconductor element part 310 is about 900, and the width W1 is about 200 m.
- the remaining structure of the semiconductor element portion 310 is the same as that of the second embodiment.
- the semiconductor element part 310 has an approximately in-plane direction of the main surface 310b having the (1-100) plane, which is the largest in the [1 120] direction, which is the short-side direction. 5. 59 X 1 0——has a thermal expansion coefficient in the vicinity of 1, and the smallest thermal expansion coefficient in the [0001] direction, which is the long side direction. 3.17 X IO ⁇ K—has a thermal expansion coefficient in the vicinity of 1. It is configured.
- the main surface 310b is the “first surface” of the present invention.
- the n-side electrode 120 is formed on a portion excluding the length L2 of about 10 inches from the resonator surface 310a on the back surface side of the n-type GaN substrate 330. That is, since the n-type GaN substrate 330 has a rectangular back surface and the n-side electrode 120 is not formed in the vicinity of the resonator surface 310a, the direction of the largest thermal expansion coefficient within the surface of the main surface 310b. The external appearance of the semiconductor element part 310 is formed so that it can be distinguished from the direction with the smallest thermal expansion coefficient. The remaining structure of the semiconductor element portion 310 is the same as that of the second embodiment.
- the submount 340 is made of a composite material of carbon and metal constituted by a graphite particle sintered body impregnated with A1.
- the submount 340 is a rectangular parallelepiped having a thickness of about 300 am, a length L4 of about 1200 m, and a width W3 of about 800 m.
- the long side direction of the submount 340 is parallel to the arrow F direction, and the short side direction is parallel to the arrow E direction.
- the submount 340 has a thermal expansion coefficient of about 7 X 10— — 1 that is the largest in the direction perpendicular to the graphite crystal plane (the direction of arrow E) in the in-plane direction of the main surface 340a, and The coefficient of thermal expansion is about 4 X 10— ⁇ ⁇ — 1 which is the smallest in the direction parallel to the arrow (direction of arrow F).
- a solder layer 150 made of AuSn or the like is formed on the main surface 340a of the submount 340! //.
- the solder layer 150 is formed with a rectangular cutout having a width W4 of about 200 ⁇ m and a length L5 of about 50 m. That is, since the shape of the main surface 340a of the submount 340 is rectangular and the rectangular notch is formed in the solder layer 150, the direction of the largest thermal expansion coefficient in the surface of the main surface 340a, The appearance of the submount 340 is formed so that it can be distinguished from the direction with the smallest coefficient of thermal expansion.
- the short side direction of the submount 340 and the direction in which the ridge portion 316 of the semiconductor element portion 310 extends match.
- the main surface 310b on the ridge portion 316 side of the semiconductor element portion 310 is joined via the solder layer 150 by a junction down method.
- the main surface 310b of the semiconductor element portion 310 passes through the solder layer 150 so that the [0001] direction of the semiconductor element portion 310 coincides with the F direction of the submount 340 on the main surface 340a of the submount 340.
- the main surface 340a is an example of the “second surface” in the present invention
- the solder layer 150 is an example of the “adhesive layer” in the present invention.
- the main surface 310b of the semiconductor element part 310 is connected to the main surface 340a of the submount 340 via the solder layer 150 so that the [0001] direction with the small coefficient coincides with the F direction with the smallest thermal expansion coefficient of the submount 340.
- the direction in which the main surface 310b of the semiconductor element portion 310 has the smallest thermal expansion coefficient and the submount 3 The direction of the main surface 340a of the 40 main surface 340a having the smallest thermal expansion coefficient can be made to coincide with the main surface 310b of the semiconductor element part 310 and the difference of the thermal expansion coefficient between the main surface 340a of the submount 340. Can do.
- the difference between the thermal expansion coefficient in the [0001] direction, which is the long side direction of the semiconductor element part 310, and the thermal expansion coefficient in the F direction of the submount 340 is By making it smaller than the difference between the thermal expansion coefficient in the [ ⁇ 1—120] direction, which is the short side direction, and the thermal expansion coefficient in the E direction of the submount 340, the short side direction (width direction) of the semiconductor element 310 Compared with, the force S can be used to effectively control the occurrence of distortion in the long side direction (length direction) where distortion is likely to occur.
- the present invention is not limited to this and is also applied to other semiconductor elements. Is possible.
- a nitride-based semiconductor is used as the material of the semiconductor element portion and the LED element portion.
- the present invention is not limited to this, and the semiconductor element portion
- a semiconductor having a Kurz structure such as ZnO may be used as the material of the LED element portion.
- the force showing an example using the (1120) plane or the (1100) plane as the main surface is not limited to this.
- the HK ⁇ - ⁇ 0) plane may be used, or a plane that is off a few degrees from the ( ⁇ ⁇ ⁇ - ⁇ 0) plane may be used.
- the force showing an example in which a solder layer made of AuSn or the like is used as the adhesive layer is not limited to this, and a solder layer made of other than AuSn is used as the adhesive layer. It may be used.
- solder composed of InSn, SnAgCu, SnAgBi, SnAgCuBi, SnAgBiln, SnZn, SnCu, SnBi, SnZnBi, or the like may be used as the adhesive layer. You can also use materials such as conductive paste as the adhesive layer.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN2007800297641A CN101501947B (zh) | 2006-08-11 | 2007-08-08 | 半导体元件和其制造方法 |
US12/161,358 US20100219419A1 (en) | 2006-08-11 | 2007-08-08 | Semiconductor element and method for manufacturing the same |
Applications Claiming Priority (4)
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JP2006219101 | 2006-08-11 | ||
JP2006-219101 | 2006-08-11 | ||
JP2007-204962 | 2007-08-07 | ||
JP2007204962A JP5113446B2 (ja) | 2006-08-11 | 2007-08-07 | 半導体素子およびその製造方法 |
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WO2008018482A1 true WO2008018482A1 (fr) | 2008-02-14 |
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ID=39033011
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/065483 WO2008018482A1 (fr) | 2006-08-11 | 2007-08-08 | Élément semi-conducteur et son procédé de fabrication |
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US (1) | US20100219419A1 (ja) |
JP (1) | JP5113446B2 (ja) |
CN (1) | CN101501947B (ja) |
WO (1) | WO2008018482A1 (ja) |
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US20090155945A1 (en) * | 2007-12-17 | 2009-06-18 | Samsung Electro-Mechanics Co., Ltd | Method of manufacturing substrate for forming device, and method of manufacturing nitride-based semiconductor laser diode |
WO2009107621A1 (ja) * | 2008-02-29 | 2009-09-03 | 三洋電機株式会社 | 半導体レーザ素子およびその製造方法 |
WO2011007874A1 (ja) * | 2009-07-17 | 2011-01-20 | 電気化学工業株式会社 | Ledチップ接合体、ledパッケージ、及びledパッケージの製造方法 |
JP2013125946A (ja) * | 2011-12-16 | 2013-06-24 | Sumitomo Electric Ind Ltd | 光モジュール、窒化物半導体レーザ装置、サブマウント |
WO2013175697A1 (ja) * | 2012-05-22 | 2013-11-28 | パナソニック株式会社 | 窒化物半導体発光装置 |
WO2017038448A1 (ja) * | 2015-09-02 | 2017-03-09 | ソニー株式会社 | 窒化物半導体素子 |
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JP4932976B2 (ja) * | 2010-05-18 | 2012-05-16 | パナソニック株式会社 | 半導体チップおよびその製造方法 |
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US9166364B2 (en) * | 2011-02-14 | 2015-10-20 | Spectrasensors, Inc. | Semiconductor laser mounting with intact diffusion barrier layer |
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JP2013236010A (ja) | 2012-05-10 | 2013-11-21 | Mitsubishi Electric Corp | 半導体装置 |
US9088135B1 (en) * | 2012-06-29 | 2015-07-21 | Soraa Laser Diode, Inc. | Narrow sized laser diode |
DE102013216527A1 (de) * | 2013-08-21 | 2015-02-26 | Osram Opto Semiconductors Gmbh | Laserbauelement und Verfahren zum Herstellen eines Laserbauelements |
US10840671B2 (en) * | 2017-03-27 | 2020-11-17 | Ushio Denki Kabushiki Kaisha | Semiconductor laser device |
JP6988268B2 (ja) * | 2017-03-27 | 2022-01-05 | ウシオ電機株式会社 | 半導体レーザ装置 |
JP6431631B1 (ja) * | 2018-02-28 | 2018-11-28 | 株式会社フィルネックス | 半導体素子の製造方法 |
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Also Published As
Publication number | Publication date |
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CN101501947A (zh) | 2009-08-05 |
JP2008066717A (ja) | 2008-03-21 |
JP5113446B2 (ja) | 2013-01-09 |
US20100219419A1 (en) | 2010-09-02 |
CN101501947B (zh) | 2011-04-20 |
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