WO2005124952A1 - 半導体発光装置およびその製造方法 - Google Patents
半導体発光装置およびその製造方法 Download PDFInfo
- Publication number
- WO2005124952A1 WO2005124952A1 PCT/JP2005/010928 JP2005010928W WO2005124952A1 WO 2005124952 A1 WO2005124952 A1 WO 2005124952A1 JP 2005010928 W JP2005010928 W JP 2005010928W WO 2005124952 A1 WO2005124952 A1 WO 2005124952A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- ridge
- shaped
- cladding layer
- emitting device
- Prior art date
Links
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
- H01S5/20—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
-
- 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
- H01S5/20—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
- H01S5/223—Buried stripe structure
- H01S5/2231—Buried stripe structure with inner confining structure only between the active layer and the upper electrode
-
- 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
- H01S2301/00—Functional characteristics
- H01S2301/18—Semiconductor lasers with special structural design for influencing the near- or far-field
- H01S2301/185—Semiconductor lasers with special structural design for influencing the near- or far-field for reduction of Astigmatism
Definitions
- the present invention relates to a semiconductor light emitting device and a method of manufacturing the same, and more particularly to a semiconductor light emitting device with an improved beam shape and a method of manufacturing the same.
- a semiconductor light emitting device such as a semiconductor laser is, for example, a CD (compact disc) or a DVD
- optical pickup device digital versatile disc
- next-generation optical disk device next-generation optical disk device
- light source of other devices it is used in various fields as a light source of an optical pickup device of (digital versatile disc), a next-generation optical disk device, and a light source of other devices.
- Non-Patent Document 1 discloses a semiconductor laser made of an AlGalnP-based material.
- FIG. 1A is a cross-sectional view of the above-described semiconductor laser.
- an n-type cladding layer 111 composed of an AlGaInP layer, an active layer 112, a p-type cladding layer 117 which functions as an AlGaInP layer (113, 115) via an n-type buffer layer (not shown)
- a p-type cap layer 118 consisting of layers is formed by laminating.
- the etching stop layer 114 of the GalnP layer is formed at the interface between the AlGalnP layer 113 and the AlGalnP layer 115, and the surface force of the p-type cap layer 118 is also processed into a ridge (convex) shape RD up to the AlGalnP layer 115, A stripe serving as a current confinement structure is formed.
- a current blocking layer 119 is formed on both sides of the ridge shape RD, and further, a p electrode 120 is formed by connecting to the p type cap layer 118, and an n electrode 121 is formed by connecting to the n type substrate 110. It is formed.
- FIG. 1B is a band gap profile in a cross section along line XX in FIG. 1A.
- the band gaps of the n-type cladding layer 111, the active layer 112, the AlGaInP layer 113, the etching stop layer 114, and the AlGalnP layer 115 are shown.
- the composition ratio of aluminum in the n-type cladding layer 111 is 0.65, and in the p-type cladding layer, the two layers of the AlGalnP layers (113, 115) are both 0.70, and the n-type The band gap is higher than that of the cladding layer 111, resulting in a structure.
- adjusting the aspect ratio of the laser beam to make the beam shape closer to a circle is one of the important issues.
- the beam shape largely depends on the refractive index of each layer constituting the semiconductor laser.
- the first leakage current is the lateral leakage current I that leaks excessively in the X direction parallel to the hetero junction in the sectional view of FIG. 1, and the second leakage current is the active layer force p-clad.
- the lateral leakage current I is suppressed by reducing the thickness of the AlGalnP layer 113 in FIG. 1 Force that has a method In practice, it is difficult to control the AlGalnP layer 113 to 300 nm or less and make it thinner .
- the photon distribution is maximized, the consumption of electron holes is increased, and the supply is short.
- the photons try to transfer to a mode that can be supplied, because the photon can not receive the electron holes that maintain the mode.
- This phenomenon brings about a change in the electron-to-light conversion efficiency, and the light output current (LI) characteristic loses its linearity and is observed as a phenomenon called kink.
- LI light output current
- Non Patent Literature 2 IEEE JQE, VOL 38, NO. 3, MARCH 2002, L 285
- the problem to be solved is that, in the semiconductor laser having the structure shown in FIG. 1, it is difficult to improve the aspect ratio of the laser beam so as to approximate a circle.
- a semiconductor light emitting device comprises a substrate, a first cladding layer of a first conductivity type formed on the substrate, an active layer formed on the first cladding layer, and the active layer. And a second cladding layer of a second conductivity type formed in a ridge shape as a current constriction structure, wherein the second cladding layer of the ridge-shaped portion is close to the active layer. It includes a first ridge-shaped layer with a high band gap on the side and a second ridge-shaped layer with a low band gap on the side far from the active layer force.
- the above semiconductor light emitting device has a substrate, a first cladding layer of a first conductivity type, an active layer, and a second cladding layer of a second conductivity type in which a portion has a ridge shape as a current confinement structure.
- the second cladding layer of the ridge-shaped portion is a side close to the active layer and has a high band gap first ridge-shaped layer, and a side far from the active layer force and a low band gap. It has a structure including two ridge-shaped layers.
- a first cladding layer of a first conductivity type, an active layer, and a second cladding layer of a second conductivity type are laminated on a substrate by an epitaxial growth method.
- Forming a second cladding layer and forming a portion of the second cladding layer in a ridge shape as a current confinement structure, and forming the second cladding layer, the portion having the ridge shape is: It is formed to include a first ridge shaped layer having a high band gap near the active layer and a second ridge shaped layer having a low band gap far from the active layer.
- At least the first cladding layer of the first conductivity type, the active layer, and the second cladding layer of the second conductivity type are formed on the substrate by epitaxial growth. Then, a part of the second cladding layer is added in a ridge shape as a current confinement structure. F.
- the ridge-shaped portion is the side closer to the active layer, the first ridge-shaped layer having a high band gap, and the side farther from the active layer force and the band gap To form a second ridge-shaped layer.
- the semiconductor light-emitting device of the present invention has a structure in which the ridge-shaped portion of the second cladding layer includes a layer having a high band gap and a layer having a low band gap, whereby the second cladding layer is formed.
- the refractive index profile that affects the shape of the beam of emitted light can be adjusted, and the aspect ratio of the beam is improved. Can be closer to a circle.
- the ridge-shaped portion of the second cladding layer is formed to include the layer having the high band gap and the layer having the low band gap.
- a structure including a low refractive index layer and a high refractive index layer it is possible to adjust the refractive index profile that affects the shape of the beam of light to be emitted, improve the aspect ratio of the beam and make it closer to a circle. Can.
- FIG. 1A is a cross-sectional view of a semiconductor laser which is a semiconductor light-emitting device according to a conventional example
- FIG. 1B is a band gap profile in a cross section along line X-X in FIG. 1A.
- FIG. 2A is a cross-sectional view of a semiconductor laser which is a semiconductor light-emitting device according to a first embodiment of the present invention
- FIG. 2B is a band gap profile at a cross section along line X-X in FIG. 2A.
- FIG. 3 is a schematic view illustrating the effect of reducing drift electrons in the first embodiment of the present invention.
- FIG. 4 is a diagram showing the results of measuring the threshold current of the semiconductor lasers of the example and the comparative example in Example 1.
- FIG. 5 is a view showing the results of measuring the haze of the semiconductor lasers of the example and the comparative example in Example 2.
- FIG. 6 is a graph showing the differential efficiency of the semiconductor lasers of the example and the comparative example. It is a figure which shows the result.
- FIG. 7 is a view showing the results of measuring kink levels of the semiconductor lasers of the example and the comparative example in Example 4.
- FIG. 8 is a diagram in which the decreasing rate of derivative coefficient KSEp in Example 5 is plotted with respect to the half value width ⁇ of the far-field pattern.
- FIG. 9A is a cross-sectional view of a semiconductor laser which is a semiconductor light emitting device according to a second embodiment of the present invention
- FIG. 9B is a band gap profile in a cross section along line XX in FIG.
- FIG. 2A is a cross-sectional view of a semiconductor laser which is a semiconductor light emitting device according to the present embodiment.
- an n-type cladding layer (first cladding layer) 11 consisting of an AlGalnP layer, an active layer 12 having a multiple quantum well structure, an AlGalnP layer force, etc.
- the d2 layer 13, the etching stop layer 14 composed of the GalnP layer, the d2 'layer (first ridge shaped layer) 15 composed of the AlGalnP layer, and the second ridge shaped layer 16 composed of the AlGalnP layer are laminated.
- To the second ridge-shaped layer 16 form the p-type cladding layer (second cladding layer) 17.
- a p-type cap layer 18 composed of a GaAs layer is formed on the second ridge-shaped layer 16. Also, the surface force of the p-type cap layer 18 is also processed into the ridge (convex) shape RD up to the AlGalnP layer 15 Thus, a stripe serving as a current constriction structure is formed, and a current blocking layer 19 made of, for example, ⁇ is formed on both sides of the ridge shape RD.
- a ⁇ electrode 20 is formed connected to the ⁇ -type cap layer 18, and an ⁇ electrode 21 is formed connected to the ⁇ -type substrate 10.
- Fig. 2 ⁇ is a band gap profile in a cross section along the X- ⁇ in Fig. 2 ⁇ .
- the band gap of each layer of the ⁇ -type cladding layer 11, the active layer 12, the d2 layer 13, the etching stop layer 14, the d2 'layer (first ridge shaped layer) 15 and the second ridge shaped layer 16 is shown.
- the height of the band gap corresponds to the height of the composition ratio of aluminum, and the band gap becomes higher as the composition ratio of aluminum is higher.
- the composition ratio of aluminum in the n-type cladding layer 11 is 0.65
- the d2 layer 13 and the d2 'layer (first ridge shaped layer) 15 are 0 ⁇ 70
- the second ridge shaped layer 16 Has become 0.65. That is, for the n-type cladding layer 11 and the p-type cladding layer 17, for example, the band gap of the n-type cladding layer 11 and the second ridge-shaped layer 16 is low d2 layer 13 and d2 'layer (first ridge Shaped layer)
- the band gap of 15 is a high profile.
- the ridge-shaped portion of the p-type cladding layer (second cladding layer) 17 (d 2 ′ layer (first ridge-shaped layer) 15, second ridge-shaped layer 16) about the active layer 12 and having a high band gap, the d2 'layer (first ridge-shaped layer) 15 and a far side from the active layer 12 and having a low band gap, It is configured to include the 2 ridge shaped layer 16.
- the d2 layer 13 and the d2 ′ layer (first ridge shaped layer) 15 of the p-type cladding layer 17 have a structure in which the band gap is higher than that of the n-type cladding layer 11.
- the high and low aluminum composition ratio corresponds to the high and low refractive index, and the higher the aluminum composition ratio, the lower the refractive index.
- the refractive index of the d2 layer 13 and the d2 'layer (first ridge shaped layer) 15 with high refractive index of the n-type cladding layer 11 and the second ridge shaped layer 16 is a low profile, ie,
- the d2 'layer (first ridge-shaped layer) 15 is configured to be a layer having a refractive index equal to that of the d2 layer 13 which is a portion excluding the ridge-shaped portion of the p-type cladding layer (second cladding layer) 17.
- the semiconductor laser which is the semiconductor light emitting device according to the present embodiment described above applies a predetermined voltage to the p electrode 20 and the n electrode 21 so that a wavelength of, for example, 650 nm band from the laser beam emitting portion. Laser light is emitted in a direction parallel to the substrate.
- the semiconductor light emitting device has a structure in which the ridge-shaped portion of the p-type cladding layer (second cladding layer) includes a layer having a high band gap and a layer having a low band gap.
- the ridge-shaped portion of the second cladding layer includes a layer having a low refractive index and a layer having a high refractive index, and the refractive index profile that affects the shape of the light beam is adjusted.
- the composition ratio XI of aluminum of the d2 ′ layer (first ridge-shaped layer) 15 is set to 0.60 ⁇ X1 ⁇ 0.70, d2 ′ layer (first ridge Shape layer) It is preferable to set X2 ⁇ X1 with respect to the composition ratio X2 of aluminum of the second ridge-shaped layer 16 which is a ridge-shaped portion other than fifteen.
- the film thickness of the d2 layer 13 can be reduced to 50 350 nm, which is a layer having a high aluminum composition ratio and a portion excluding the ridge-shaped portion of the p-cladding (second clad). This causes the current I to leak too much in the direction parallel to the heterojunction.
- the ridge portion is configured to include the low refractive index layer of the d2 ′ layer (first ridge shaped layer) 15 and the high refractive index layer of the second ridge shaped layer 16.
- the d2 layer 13 is thinned to 50 350 nm, it is possible to reduce the resistance of the semiconductor laser and the current (resistance, carrier density), and the electron overflow from the active layer to the p side which has been a problem conventionally. Can be suppressed, and differential efficiency and kink level are improved.
- the layer d2 '(the first ridge-shaped layer) 15 (0.60 ⁇ X1 ⁇ 0.70) having a high A1 composition is used. It can be introduced and its thickness can be increased to 50 400.
- electrons overflowed from the active layer 12 may pass through the X_band, pass through the d2 layer 13, and recombine at the etching stop layer 14.
- this d2 'layer first The effect of (15) was found to decrease the threshold current and improve the temperature characteristics.
- FIG. 3 is a schematic view for explaining the effect of reducing drift electrons in the present embodiment.
- the ridge-shaped portion of the p-type cladding layer (second cladding layer) 17 includes the d2, layer (first ridge-shaped layer) 15 having a high band gap and the second ridge having a low band gap.
- the d2 '(first ridge shaped layer) 15 is not provided in contact with the SCH (Separate Confinement Hetero-stmcture) guide layer of the active layer 12, and is formed of the d2 layer 13 and the etching.
- the force sandwiching the stop layer 14 has been experimentally confirmed to have the effect of suppressing this drift electron as its thickness is increased.
- the etching rate for the d2 'layer (first ridge-shaped layer) 15 is higher than the etching rate for the second ridge-shaped layer 16.
- the stripe width of the lower side can be narrowed by about 0.2 z m as compared with the case where the same upper side is manufactured. That is, since the ridge shape can be made to stand more than before, the kink level is improved.
- the thickness of the d2 layer 13 is preferably about 50 to 350 nm. If it exceeds 350 m m, the current I leaking excessively in the direction parallel to the hetero junction becomes large. Not desirable.
- the sum of the film thickness of the d2 layer 13 and the d2 'layer (first ridge shaped layer) 15 be 750 nm or less. If it exceeds 750 nm, the beam wrinkles will deteriorate.
- the film thickness of the d2 'layer (first ridge-shaped layer) 15 is preferably about 50 to 400 nm, and as described above, this is a film of the d2 layer 13 and the d2' layer (first ridge-shaped layer) 15 It is for the sum of thickness not to exceed 750 nm.
- a semiconductor laser having the configuration shown in FIG. 2 is produced as an example, while a semiconductor laser having the configuration shown in FIG. 1 is produced as a comparative example. The current was measured.
- the lower threshold current was obtained in the semiconductor laser of the example than in the comparative example.
- Example 2 In the same manner as in Example 1, the semiconductor laser of the example and the semiconductor laser of the comparative example were prepared, and the far-field pattern in the direction perpendicular to the heterojunction was observed for both semiconductor lasers, and ⁇ ⁇ was measured.
- the semiconductor laser of the example obtained a smaller value of ⁇ than that of the comparative example.
- Example 2 In the same manner as in Example 1, the semiconductor laser of the example and the semiconductor laser of the comparative example were prepared, and the differential efficiency was measured between the two semiconductor lasers.
- the semiconductor laser of the example obtained a value of differential efficiency larger than that of the comparative example.
- Example 2 In the same manner as in Example 1, the semiconductor laser of the example and the semiconductor laser of the comparative example were prepared, and kink levels (100 ns, 70 ° C.) were measured for both semiconductor lasers.
- the semiconductor laser of the example has an improved kink level compared to the comparative example.
- Example 5
- the semiconductor laser of the example and the semiconductor laser of the comparative example are prepared in the same manner as in Example 1, and for both semiconductor lasers, the reduction rate of the derivative of L 1 I curve KSE p and the reference of light confinement in the X direction The half-width ⁇ of the far-field pattern was measured. KSEp indicates that the degree of tortuosity of L-I is large (generation of kink) when the value is increased.
- Figure 8 is a plot of the decrease rate KSEp of the derivative against the half-width ⁇ (output 5 mW) of the far-field pattern.
- the kink level does not deteriorate even if the half width of the far-field pattern is increased.
- Example 2 In the same manner as in Example 1, the semiconductor laser of the example and the semiconductor laser of the comparative example were prepared, and the operating current values at the time of high temperature operation were measured for both semiconductor lasers.
- an n-type cladding layer (first cladding layer) 11 comprising an unshown buffer layer and an AlGaInP layer on an n-type substrate 10 by an epitaxial growth method such as metalorganic vapor phase epitaxial growth (MOVPE) Layer 12, d2 layer 13 composed of AlGaInP layer, etching stop layer 14 composed of GalnP layer, d2 'layer (first ridge shaped layer) 15 also comprising AlGaInP layer 15, second ridge shaped layer 16 composed of AlGaInP layer 16, GaAs Layered p-type cap layers 18 are sequentially laminated.
- MOVPE metalorganic vapor phase epitaxial growth
- d2 layer 13 composed of AlGaInP layer
- etching stop layer 14 composed of GalnP layer
- d2 'layer (first ridge shaped layer) 15 also comprising AlGaInP layer
- second ridge shaped layer 16 composed of AlGaInP layer 16
- the composition ratio of aluminum in the n-type cladding layer 11 is 0.65
- the d2 layer 13 and the d2 'layer (first ridge-shaped layer) 15 have 0.70
- the second ridge shape Layer 16 is 0.
- a film is formed as 65.
- the portion (d2 layer 13) excluding the ridge-shaped portion of the second cladding layer as the d2 'layer (first ridge-shaped layer) 15 Form layers with equal rates.
- a resist film is patterned to protect a portion to be a current injection region, and an etching process is stopped to stop at the etching stop layer 14, and a surface of a p-type cap layer 18 to be a current constriction structure
- a ridge (convex) shape RD is formed from the first to the d2 'layer (first ridge shaped layer) 15.
- AllnP or the like is deposited on the entire surface to form a current blocking layer 19, and a contact opening is made to expose the p-type cap layer 18.
- a p electrode 20 of Ti / Pt / Au or the like is formed to be connected to the p-type cap layer 18, while an n electrode such as AuGe / Ni / Au is connected to be connected to the n-type substrate 10.
- a desired semiconductor laser as shown in FIG. 2A can be obtained.
- the ridge-shaped portion of the second cladding layer is formed to include the layer having the high band gap and the layer having the low band gap.
- the present invention is not limited to this, and the present embodiment can be applied to an AlGaN-based semiconductor light emitting device.
- the layer configuration and structure can be the same as in FIG. 2A of the AlGalnP system, and in this case, the composition ratio XI of aluminum in the d2 ′ layer (first ridge-shaped layer) is set to 0.05 ⁇ X1 ⁇ 0.20.
- the composition ratio X2 of aluminum in a layer other than the d2 'layer (first ridge-shaped layer) such as a ridge-shaped layer to X2 ⁇ X1.
- FIG. 9A is a cross-sectional view of a semiconductor laser which is a semiconductor light emitting device according to the present embodiment.
- the semiconductor laser according to the present embodiment has the same configuration as that of the first embodiment.
- an n-type cladding layer (first cladding layer) 11 composed of an AlGalnP layer, an active layer 12 having a multiple quantum well structure, an AlGalnP layer via an n-type buffer layer (not shown).
- D2 layer 13 consisting of Al, GalnP layer etching stop layer 14, AlGalnP layer force d2, layer (first ridge-shaped layer) 15, second ridge-shaped layer 16 consisting of AlGaInP layer, d2 layer 13
- a p-type cap layer 18 made of a GaAs layer is formed on the second ridge shaped layer 16.
- the surface force of the p-type cap layer 18 is also processed into a ridge (convex) shape RD up to the AlGalnP layer 15 to form a stripe serving as a current constriction structure.
- a ridge (convex) shape RD up to the AlGalnP layer 15 to form a stripe serving as a current constriction structure.
- ⁇ and so on both sides of the ridge shape RD A current blocking layer 19 is formed.
- a ⁇ electrode 20 is formed connected to the ⁇ -type cap layer 18, and an ⁇ electrode 21 is formed connected to the ⁇ -type substrate 10.
- FIG. 9A is a band gap profile in a cross section along X- ⁇ in FIG.
- the band gap of each layer of the ⁇ -type cladding layer 11, the active layer 12, the d2 layer 13, the etching stop layer 14, the d2 'layer (first ridge shaped layer) 15 and the second ridge shaped layer 16 is shown.
- the height of the band gap corresponds to the height of the composition ratio of aluminum, and the band gap becomes higher as the composition ratio of aluminum is higher.
- the composition ratio X2 of aluminum of the second ridge-shaped layer 16 which is a portion of the ridge shape other than 15 is set to X2 ⁇ X0 ⁇ XI.
- the composition ratio of aluminum in the n-type cladding layer 11 is made equal to the composition ratio X2 of aluminum in the second ridge-shaped layer 16.
- the composition ratio of aluminum in the n-type cladding layer 11 is 0.65, and the p-type cladding layer is covered, d2 layer 13 force 0.68, d2 'layer (first ridge shaped layer) 15 force 0. 75-0
- the 80, second ridge shaped layer 16 is 0.65.
- the band gap of the n-type cladding layer 11 and the second ridge-shaped layer 16 is low.
- the band gap of the d2 layer 13 is high. (First ridge shaped layer)
- the band gap of 15 is an even higher profile.
- the semiconductor laser of the present embodiment includes a ridge-shaped portion of a p-type cladding layer (second cladding layer) 17. Minute (d2 'layer (first ridge-shaped layer) 15, second ridge-shaped layer 16), the d2' layer (first ridge-shaped layer) 15 having a high band gap near the active layer 12 and It is configured to include a second ridge shaped layer 16 which is far from the layer 12 and has a low band gap.
- the d2 layer 13 and the d2 ′ layer (first ridge shaped layer) 15 of the p-type cladding layer 17 have a structure in which the band gap is higher than that of the n-type cladding layer 11.
- the high and low of the refractive index correspond to the high and low of the composition ratio of aluminum, and the refractive index becomes lower as the composition ratio of aluminum is higher.
- the refractive index of the n-type cladding layer 11 and the second ridge-shaped layer 16 is high for the n-type cladding layer 11 and the p-type cladding layer 17.
- the refractive index profile of the 'layer (first ridge-shaped layer) 15 is lower.
- the d2 'layer (first ridge-shaped layer) 15 has a lower refractive index than the d2 layer 13 which is a portion excluding the ridge-shaped portion of the p-type cladding layer (second cladding layer) 17. is there.
- the semiconductor laser of the present embodiment is substantially the same as the first embodiment.
- the semiconductor laser which is the semiconductor light emitting device according to the present embodiment, applies a predetermined voltage to the p electrode 20 and the n electrode 21 so that a laser beam having a wavelength of, for example, the 650 nm band from the laser beam emitting portion. Are emitted in a direction parallel to the substrate.
- the semiconductor light emitting device has a structure in which the ridge-shaped portion of the p-type cladding layer (second cladding layer) includes a layer having a high band gap and a layer having a low band gap.
- the ridge-shaped portion of the second cladding layer includes a layer having a low refractive index and a layer having a high refractive index, and the refractive index profile that affects the shape of the light beam is adjusted.
- the refractive index of the n-type cladding layer 11 and the second ridge-shaped layer 16 is high d2 layer 1 If the refractive index profile of the d2 'layer (first ridge-shaped layer) 15 with a lower refractive index of 3 is further lowered, the light distribution in the longitudinal direction of the laser can be designed with a higher degree of freedom, and the second ridge shape Besides adjusting the aluminum composition of the layer 16 and the film thickness of the d2 layer 13 and the d2 'layer (first ridge shaped layer) 15, the aluminum composition of the d2 layer 13 and d2' layer (first ridge shaped layer) 15 is adjusted By doing this, the light distribution can be optimized, and the spot of the emitted laser light can be made closer to a true circle.
- the thickness of the d2 layer 13 is about 50 to 350, and the thickness of the d2, layer (first ridge-shaped layer) 15 is The sum of the film thickness of the d2 layer 13 and the d2 'layer (first ridge-shaped layer) 15 is preferably 750 nm or less.
- the semiconductor laser according to the present embodiment can have a configuration in which the aluminum composition of the d2 ′ layer (first ridge-shaped layer) 15 is further enhanced than in the first embodiment.
- the higher the aluminum composition the faster the etching rate at the time of processing into the ridge shape, so that the etching rate ratio with the etching stop layer 14 can be further increased. Since the ridge shape can be made to stand more than the embodiment, the kink level is improved. Moreover, the etching nonuniformity in the wafer surface of a clad
- a layer having a refractive index lower than that of the portion other than the ridge-shaped portion of the second cladding layer is used as the first ridge-shaped layer.
- the present invention is not limited to the above description.
- the present invention is applicable to AlGaAs-based semiconductor light emitting devices.
- the semiconductor light emitting device of the present invention can be applied to various fields as a light source of an optical pickup device of a CD, a DVD, and a next-generation optical disk device, or a light source of other devices.
- the method of manufacturing a semiconductor light emitting device of the present invention is a CD, a DVD, and further, a next-generation optical disc. It can be applied as a method of manufacturing the light source of the optical pickup device of the device or the light source of other devices.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006514749A JPWO2005124952A1 (ja) | 2004-06-18 | 2005-06-15 | 半導体発光装置およびその製造方法 |
KR1020067003251A KR101145965B1 (ko) | 2004-06-18 | 2005-06-15 | 반도체 발광 장치 및 그 제조 방법 |
US10/568,786 US7532655B2 (en) | 2004-06-18 | 2005-06-15 | Semiconductor light emitting device and method of producing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004181111 | 2004-06-18 | ||
JP2004-181111 | 2004-06-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005124952A1 true WO2005124952A1 (ja) | 2005-12-29 |
Family
ID=35510041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010928 WO2005124952A1 (ja) | 2004-06-18 | 2005-06-15 | 半導体発光装置およびその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7532655B2 (ja) |
JP (1) | JPWO2005124952A1 (ja) |
KR (1) | KR101145965B1 (ja) |
CN (1) | CN100479282C (ja) |
TW (1) | TWI278158B (ja) |
WO (1) | WO2005124952A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014068814A1 (ja) * | 2012-10-31 | 2014-05-08 | パナソニック株式会社 | 半導体発光装置およびその製造方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101895715B1 (ko) | 2017-04-12 | 2018-09-05 | 김영주 | 대추칩 제조 장치 및 그 방법 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09232678A (ja) * | 1996-02-20 | 1997-09-05 | Nec Corp | 半導体装置及びその製造方法、並びに半導体レーザ及びその製造方法 |
JPH10294529A (ja) * | 1996-09-09 | 1998-11-04 | Toshiba Corp | 半導体レーザ及びその製造方法 |
JPH11251678A (ja) * | 1998-02-27 | 1999-09-17 | Sanyo Electric Co Ltd | 半導体レーザ及びその製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04359486A (ja) * | 1991-06-05 | 1992-12-11 | Fujitsu Ltd | 半導体発光装置 |
US6031858A (en) | 1996-09-09 | 2000-02-29 | Kabushiki Kaisha Toshiba | Semiconductor laser and method of fabricating same |
JP3672062B2 (ja) * | 1997-07-16 | 2005-07-13 | 三菱電機株式会社 | 半導体レーザ,及びその製造方法 |
JP2002204028A (ja) * | 2000-12-27 | 2002-07-19 | Furukawa Electric Co Ltd:The | 半導体装置およびその製造方法 |
US7260130B2 (en) * | 2003-03-31 | 2007-08-21 | Sanyo Electric Co., Ltd. | Semiconductor laser device and method of fabricating the same |
-
2005
- 2005-06-15 CN CNB2005800009255A patent/CN100479282C/zh not_active Expired - Fee Related
- 2005-06-15 WO PCT/JP2005/010928 patent/WO2005124952A1/ja active Application Filing
- 2005-06-15 KR KR1020067003251A patent/KR101145965B1/ko not_active IP Right Cessation
- 2005-06-15 JP JP2006514749A patent/JPWO2005124952A1/ja active Pending
- 2005-06-15 US US10/568,786 patent/US7532655B2/en not_active Expired - Fee Related
- 2005-06-16 TW TW094120060A patent/TWI278158B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09232678A (ja) * | 1996-02-20 | 1997-09-05 | Nec Corp | 半導体装置及びその製造方法、並びに半導体レーザ及びその製造方法 |
JPH10294529A (ja) * | 1996-09-09 | 1998-11-04 | Toshiba Corp | 半導体レーザ及びその製造方法 |
JPH11251678A (ja) * | 1998-02-27 | 1999-09-17 | Sanyo Electric Co Ltd | 半導体レーザ及びその製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014068814A1 (ja) * | 2012-10-31 | 2014-05-08 | パナソニック株式会社 | 半導体発光装置およびその製造方法 |
US9276379B2 (en) | 2012-10-31 | 2016-03-01 | Panasonic Intellectual Property Management Co., Ltd. | Semiconductor light emitting device and method for manufacturing same |
JPWO2014068814A1 (ja) * | 2012-10-31 | 2016-09-08 | パナソニックIpマネジメント株式会社 | 半導体発光装置およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1842947A (zh) | 2006-10-04 |
TWI278158B (en) | 2007-04-01 |
CN100479282C (zh) | 2009-04-15 |
JPWO2005124952A1 (ja) | 2008-07-31 |
KR20070028274A (ko) | 2007-03-12 |
KR101145965B1 (ko) | 2012-05-15 |
TW200614611A (en) | 2006-05-01 |
US7532655B2 (en) | 2009-05-12 |
US20060284186A1 (en) | 2006-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5247444B2 (ja) | 半導体レーザ装置 | |
TW200814479A (en) | Semiconductor laser device | |
JP4295776B2 (ja) | 半導体レーザ装置及びその製造方法 | |
JP2012038882A (ja) | 面発光レーザ、面発光レーザアレイ、面発光レーザアレイを光源とする表示装置、プリンタヘッドおよびプリンタ | |
JP4780999B2 (ja) | 半導体レーザ素子の製造方法 | |
US20120114004A1 (en) | Nitride semiconductor laser device and method of manufacturing the same | |
WO2005124952A1 (ja) | 半導体発光装置およびその製造方法 | |
JPH11186665A (ja) | 半導体発光素子 | |
JP2980302B2 (ja) | 半導体レーザ | |
WO2018043229A1 (ja) | 半導体レーザ素子 | |
JP2009302582A (ja) | 二波長半導体レーザ装置 | |
JP2006269988A (ja) | 半導体レーザ | |
JP4700154B2 (ja) | 半導体レーザ | |
JP4712460B2 (ja) | 半導体発光素子及びその製造方法 | |
JP2006253235A (ja) | レーザダイオードチップ、レーザダイオード及びレーザダイオードチップの製造方法 | |
JP2011055009A (ja) | 半導体レーザ | |
JP4048695B2 (ja) | 半導体混晶層の製造方法、及び半導体デバイスと半導体発光素子 | |
JP2001053386A (ja) | 半導体レーザ素子 | |
JP4603113B2 (ja) | 半導体レーザ | |
JP2001332811A (ja) | 半導体レーザ素子、及び、その製造方法 | |
JP3422365B2 (ja) | リッジストライプ型半導体レーザ装置 | |
JP4093709B2 (ja) | 半導体レーザ素子 | |
JP2010016118A (ja) | 半導体レーザ装置およびその製造方法 | |
JP2008270434A (ja) | 不純物拡散方法、ならびにモノリシック型半導体レーザ素子およびその製造方法 | |
JP2006253234A (ja) | レーザダイオードチップ、レーザダイオード及びレーザダイオードチップの製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200580000925.5 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006284186 Country of ref document: US Ref document number: 2006514749 Country of ref document: JP Ref document number: 10568786 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067003251 Country of ref document: KR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 10568786 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1020067003251 Country of ref document: KR |
|
122 | Ep: pct application non-entry in european phase |