WO2023144960A1 - 光半導体装置 - Google Patents
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- 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
- H01S5/227—Buried mesa structure ; Striped active layer
- H01S5/2275—Buried mesa structure ; Striped active layer mesa created by etching
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- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
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- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34306—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 emitting light at a wavelength longer than 1000nm, e.g. InP based 1300 and 1500nm lasers
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- H10H20/8142—Bodies having reflecting means, e.g. semiconductor Bragg reflectors forming resonant cavity structures
Definitions
- the present disclosure relates to an optical semiconductor device.
- An optical semiconductor device has been developed in which a laser array chip in which a plurality of edge-emitting lasers are arranged in an array in the lateral direction is junction-down mounted.
- the passive part other than the contact opening for current injection was covered with an insulating film in order to cut off the current path passing through other than the light emitting point.
- a semiconductor laser has been proposed in which an n-type InP layer is provided on a p-type InGaAsP contact layer in the vicinity of the facet to prevent current injection in the vicinity of the facet (see, for example, Patent Document 1).
- this semiconductor laser has a current injection region and a non-current injection region arranged between the front facet and the rear facet, and is not a laser array chip in which a plurality of edge emitting lasers are arranged laterally in an array.
- the specified number of non-defective single lasers must be consecutive. Therefore, when a defective single laser is generated, the yield can be improved by cutting out a good laser array chip at an arbitrary position so as to remove the defect.
- the entire passive portion is covered with a hard insulating film as in the conventional structure, it is difficult to perform cleavage from above.
- the passive portion is not provided with an insulating film, solder will flow into the portion without the insulating film when junction-down mounting is performed. Therefore, an unexpected current path is generated, which poses a problem that the mounting method is restricted.
- the present disclosure has been made to solve the above-described problems, and its purpose is to be able to prevent current from flowing to the passive section even when junction-down mounting is performed, and to prevent the flow of current in any passive section due to cleavage.
- An optical semiconductor device capable of cutting out chips is obtained.
- An optical semiconductor device includes a semiconductor substrate of a first conductivity type, an active section and a passive section alternately arranged along a first direction on the semiconductor substrate, and an active section provided on the active section.
- the active section has an active layer, a second conductivity type cladding layer, and a second conductivity type contact layer which are sequentially stacked on the semiconductor substrate, and the active section includes the first electrode.
- the passive section It has a two-conductivity-type contact layer and a first-conductivity-type layer provided on the second-conductivity-type contact layer.
- a first conductivity type layer is provided between the second conductivity type contact layer and the electrode in the passive section.
- FIG. 1 is a cross-sectional view showing an optical semiconductor device according to Embodiment 1;
- FIG. 2 is a cross-sectional view along I-II of FIG. 1;
- FIG. 1 is a cross-sectional view showing a state in which the optical semiconductor device according to Embodiment 1 is junction-down mounted;
- FIG. 8 is a cross-sectional view showing an optical semiconductor device according to Embodiment 2;
- FIG. 11 is a cross-sectional view showing a state in which the optical semiconductor device according to the second embodiment is junction-down mounted;
- FIG. 12 is a cross-sectional view showing an optical semiconductor device according to Embodiment 3;
- FIG. 14 is a cross-sectional view showing a state in which the optical semiconductor device according to the third embodiment is junction-down mounted;
- FIG. 11 is a perspective view showing an optical semiconductor device according to a fourth embodiment;
- FIG. 9 is a cross-sectional view along I-II of FIG. 8;
- FIG. 11 is a perspective view showing an optical semiconductor device according to a fifth embodiment;
- FIG. 11 is a cross-sectional view along I-II of FIG. 10;
- FIG. 1 is a cross-sectional view showing an optical semiconductor device according to Embodiment 1.
- FIG. Let X be the horizontal direction perpendicular to the laser cavity, Y be the stacking direction of the semiconductor layers, and Z be the direction of the laser cavity in which light propagates. 1 shows the XY plane and FIG. 2 shows the YZ plane.
- the optical semiconductor device is an edge-emitting type stripe structure laser array
- a waveguide type optical semiconductor device such as an LED, an optical amplifier, or an optical modulator may be used. A similar effect can be obtained.
- the optical semiconductor device has two or more active portions A.
- a p-type electrode 2 is provided on the active section A and the passive section B.
- An n-type electrode 3 is provided on the bottom surface of the n-type InP substrate 1 .
- the active section A has an active layer 4, a p-type InP cladding layer 5, and a p-type InGaAs contact layer 6 which are laminated on the n-type InP substrate 1 in this order.
- the p-type InGaAs contact layer 6 of the active portion A exposed on the outermost surface is in contact with the p-type electrode 2 .
- the passive section B has an active layer 4, a p-type InP cladding layer 5, a p-type InGaAs contact layer 6, and an n-type InP layer 7 which are stacked in order on the n-type InP substrate 1. It differs from the active section A in that an n-type InP layer 7 is provided between the p-type InGaAs contact layer 6 and the p-type electrode 2 .
- the passive section B is adjacent to the active section A.
- the p-type electrode 2 and the n-type electrode 3 of the active section A may be within the range of the active section A, or may protrude to the passive section B.
- the n-type InP substrate 1 has a (001) plane as a main surface, is doped with Si, and has a carrier concentration of 4E+18 cm ⁇ 3 .
- the active layer 4 is made of AlGaInAs-based or InGaAsP-based material and has a thickness of 0.2 ⁇ m.
- the p-type InP cladding layer 5 is doped with Zn and has a carrier concentration of 1E+18 cm ⁇ 3 and a thickness of 2 ⁇ m.
- the p-type InGaAs contact layer 6 has a carrier concentration of 1E+19 cm ⁇ 3 and a thickness of 0.3 ⁇ m.
- the n-type InP layer 7 has a carrier concentration of 1E+18 cm ⁇ 3 and a thickness of 0.1 ⁇ m.
- An n-type InP clad layer having a carrier concentration of 4E+18 cm ⁇ 3 and a thickness of 0.5 ⁇ m may be interposed between the n-type InP substrate 1 and the active layer 4 .
- Active layer 4 may include a multiple quantum well structure or a quantum dot structure.
- the p-type InGaAs contact layer 6 may have a structure in which p-type InGaAs and p-type InGaAsP are combined.
- a p-type InP layer having a carrier concentration of 1E+18 cm ⁇ 3 and a thickness of 0.1 ⁇ m may be sandwiched between the p-type InGaAs contact layer 6 and the n-type InP layer 7 .
- FIG. 2 is a cross-sectional view along I-II in FIG.
- the active portion A has a resonator structure sandwiched between a front facet 8 and a rear facet 9 parallel to the XY plane in the Z direction.
- an active layer 4 on an n-type InP substrate 1, an active layer 4, a p-type InP cladding layer 5, a p-type InGaAs contact layer 6, and an n-type InP layer 7 are sequentially crystallized using a semiconductor film growth apparatus such as MOCVD or MBE. grow up. After growing this laminated structure, a photoresist is applied on the n-type InP layer 7 on the outermost surface. Next, a striped opening extending in the [110] direction is formed in the photoresist in the region corresponding to the active portion A. Next, as shown in FIG. The opening width is between 0.5 ⁇ m and 20 ⁇ m, and the X-direction spacing between the openings is between 100 ⁇ m and 300 ⁇ m, but is not limited to this range.
- hydrochloric acid is used to remove the n-type InP layer 7 exposed from the opening of the photoresist, exposing the p-type InGaAs contact layer 6 thereunder. Since InGaAs has a lower etching rate to hydrochloric acid than InP, only the InP layer can be selectively etched.
- a single metal containing Au, Pt, Zn, Ge, Ni, Ti or a combination of these metals is deposited on the p-type InGaAs contact layer 6 and under the n-type InP substrate 1. , a p-type electrode 2 and an n-type electrode 3 are formed. A vapor deposition or sputtering apparatus is used for metal film formation.
- a front end surface 8 and a rear end surface 9 each having a (110) plane are formed by cleavage.
- the passive portion B where the n-type InP layer 7 is exposed on the outermost surface is cleaved in the [110] direction to manufacture a laser array in which an arbitrary number of stripe lasers are arranged. Since this laser array can be manufactured by crystal growth only once, it can be manufactured efficiently at low cost.
- FIG. 3 is a cross-sectional view showing a state in which the optical semiconductor device according to Embodiment 1 is junction-down mounted.
- the optical semiconductor device is junction-down mounted on a submount 11 using solder 10 with the p-type electrode 2 of the optical semiconductor device facing downward.
- Junction-down mounting improves heat dissipation by bringing the distance between the active layer 4 and the submount 11 closer. It has the advantage of good controllability.
- the active layer 4 of the active section A gains by current injection, but the passive section B does not. Therefore, light generated by recombination of electrons and holes propagates only through the active portion A.
- FIG. The light gains gain while reciprocating in the Z direction in the cavity sandwiched between the front facet 8 and the rear facet 9 , and is emitted from the front facet 8 after laser oscillation.
- the length of the resonator sandwiched between the front facet 8 and the rear facet 9 varies depending on the application, and can generally range from 0.15 mm to 4 mm, but is not limited to this range.
- the n-type InP layer 7 is provided between the p-type InGaAs contact layer 6 and the p-type electrode 2 in the passive portion B. As shown in FIG. As a result, it is possible to prevent current from flowing through the passive section B even when junction-down mounting is performed. In addition, since the surface of the passive portion B does not need to be covered with a hard insulating film such as SiO 2 , any passive portion B can be cut out by cleaving. Therefore, a laser array can be manufactured by selecting a region where non-defective lasers are arranged.
- FIG. 4 is a cross-sectional view showing an optical semiconductor device according to Embodiment 2.
- the optical semiconductor device is an edge-emitting type embedded structure laser array
- the present invention is not limited to this, and waveguide-type optical semiconductor devices such as LEDs, optical amplifiers, and optical modulators can also be used. A similar effect can be obtained.
- a ridge structure D extending in the Z direction is formed by etching from the p-type InP cladding layer 5 to below the active layer 4 .
- a buried layer 12 is formed to cover the side surface of the ridge structure D up to a position higher than the active layer 4 .
- Buried layer 12 is a semi-insulating material such as InP doped with Ru or Fe, but may be a combination of semiconductor layers with different carrier concentrations or polarities.
- buried layer 12 is InP doped with 5E+16 cm 3 Fe.
- the width of the ridge structure D is 0.5-2.0 um, but is not limited to this range.
- a p-type InGaAs contact layer 6 is formed on the ridge structure D and the buried layer 12 .
- the passive part B has a buried layer 12, a p-type InGaAs contact layer 6, and an n-type InP layer 7 which are stacked in this order on the n-type InP substrate 1.
- a p-type InP layer may be provided between the p-type InP cladding layer 5 and the buried layer 12 on the outermost surface of the ridge structure D and the p-type InGaAs contact layer 6 .
- Other configurations are the same as those of the first embodiment.
- an active layer 4 and a p-type InP clad layer 5 are crystal-grown on an n-type InP substrate 1 in this order.
- a striped mask pattern extending in the [110] direction is formed. Stripe mask widths are often between 0.5 um and 2 um, but are not limited to this range.
- etching is performed down to the bottom of the active layer 4 to form a ridge structure D.
- a buried layer 12 is grown to cover the sides of the ridge structure D up to the active layer 4 .
- a p-type InGaAs contact layer 6 and an n-type InP layer 7 are grown on the buried layer 12 and the p-type InP cladding layer 5 on the outermost surface of the ridge structure D to complete the crystal growth process. do. Subsequent steps are the same as in the first embodiment.
- FIG. 5 is a cross-sectional view showing the junction-down mounted state of the optical semiconductor device according to the second embodiment.
- the optical semiconductor device is junction-down mounted on a submount 11 using solder 10 with the p-type electrode 2 of the optical semiconductor device facing downward.
- a forward voltage is applied to the p-type electrode 2 and the n-type electrode 3
- holes are supplied from the p-type InGaAs contact layer 6 through the p-type InP cladding layer 5 to the active layer 4 in the active portion A.
- Electrons are supplied from the InP substrate 1 to the active layer 4 .
- a semi-insulating material is used for the buried layer 12, current does not easily flow through the buried layer 12 having a high resistivity, so current can be efficiently injected into the active layer 4.
- the semi-insulating material used for the buried layer 12 does not necessarily have high resistivity.
- Zn which is a dopant material, diffuses into the buried layer 12 from the adjacent p-type InGaAs contact layer 6 or p-type InP clad layer 5 during wafer processing, the resistivity decreases and a current path is generated in the buried layer 12. In some cases.
- the passive portion B since a reverse voltage is applied between the n-type InP layer 7 and the p-type InGaAs contact layer 6, the current is blocked and no current path to the buried layer 12 is generated.
- any passive portion B can be cut out by cleaving a chip.
- FIG. 6 is a cross-sectional view showing an optical semiconductor device according to a third embodiment.
- a groove portion E is formed by etching from the p-type InGaAs contact layer 6 to the n-type InP substrate 1 under the buried layer 12 between the active portions A and the passive portions B that are alternately arranged in the X direction.
- the active portion A and the trench portions E on both sides thereof form a mesa structure.
- the inner surface of the trench E is covered with an insulating film 13 .
- the insulating film 13 may protrude up to the active part A or the passive part B.
- the width of the groove E is about 5 to 20 ⁇ m, but it may be wider.
- the side surface of the groove E may be vertical or may have a gentle slope.
- the width of the active portion A is often within 20 ⁇ m, but it may be wider.
- semiconductor crystal growth is performed in the same manner as in the second embodiment, and then the n-type InP layer 7 is removed using hydrochloric acid in the region corresponding to the active portion A to expose the p-type InGaAs contact layer 6 thereunder.
- a mask having striped openings extending in the [110] direction is formed on the outermost p-type InGaAs contact layer 6 and the n-type InP layer 7 .
- the p-type InGaAs contact layer 6 or the n-type InP layer 7 is exposed through the opening.
- the exposed semiconductor layer is etched down to the bottom of the buried layer 12 to form a groove portion E. Then, as shown in FIG.
- an insulating film 13 such as SiO 2 or SiN having a thickness of 0.4 ⁇ m is formed so as to cover the entire surface of the semiconductor layer.
- a mask having stripe-shaped openings extending in the [110] direction is formed using a photoresist.
- the insulating film 13 is etched to form an electrode contact insulating film opening over the active portion A and a cleavage insulating film opening over the passive portion B.
- the optical semiconductor device according to the present embodiment is manufactured by forming the n-type electrode 3, the p-type electrode 2, and the like in the same manner as in the first embodiment.
- FIG. 7 is a cross-sectional view showing a state in which the optical semiconductor device according to Embodiment 3 is junction-down mounted.
- the optical semiconductor device according to the third embodiment is junction-down mounted on a submount 11 using solder 10 with the p-type electrode 2 facing downward. Since the parasitic capacitance of the element can be reduced by providing the groove E, the modulation operation can be performed at a higher speed than in the second embodiment. Moreover, even if the solder 10 flows into the groove E, the insulating film 13 covering the groove E can prevent an ineffective current path not passing through the active layer 4 from being generated. In addition, the same effects as those of the second embodiment can be obtained.
- FIG. 8 is a perspective view showing an optical semiconductor device according to Embodiment 4.
- FIG. A plane parallel to the substrate surface is defined as the XZ plane, and the stacking direction of the semiconductor layers is defined as the Y direction.
- a plurality of active portions A are formed in a matrix on the n-type InP substrate 1 in plan view. That is, a plurality of active portions A are arranged in the XZ plane to form a two-dimensional array structure.
- a passive section B is formed on the n-type InP substrate 1 so as to surround the active section A in plan view. That is, the side surfaces of the active portion A in the X direction and the Z direction are surrounded by the passive portion B. As shown in FIG.
- a p-type electrode 2 is provided on the active section A and the passive section B. As shown in FIG. An n-type electrode 3 is provided on the bottom surface of the n-type InP substrate 1 .
- a surface emitting LED is used as an example of a two-dimensional array structure, but the same effect can be obtained with surface emitting lasers, optical amplifiers, optical modulators, and the like as long as they are surface-type optical semiconductor devices.
- FIG. 9 is a cross-sectional view along I-II in FIG.
- the active portion A has an active layer 4, a p-type InP cladding layer 5, and a p-type InGaAs contact layer 6 which are laminated on the n-type InP substrate 1 in this order.
- a p-type InGaAs contact layer 6 on the outermost surface of the active portion A is in contact with the p-type electrode 2 .
- the p-type InGaAs contact layer 6 exposed on the outermost surface is not limited to a circular shape, and may have an arbitrary shape such as a rectangular shape.
- the p-type electrode 2 and the n-type electrode 3 do not need to cover the entire surface of the semiconductor layer, and a hole for passing light may be formed in a part of the semiconductor layer.
- the passive section B has an active layer 4, a p-type InP cladding layer 5, a p-type InGaAs contact layer 6, and an n-type InP layer 7 which are stacked in order on the n-type InP substrate 1. It differs from the active section A in that an n-type InP layer 7 is provided between the p-type InGaAs contact layer 6 and the p-type electrode 2 .
- the p-type electrode 2 and the n-type electrode 3 of the active section A may be within the range of the active section A, or may protrude to the passive section B.
- an active layer 4 on an n-type InP substrate 1, an active layer 4, a p-type InP clad layer 5, a p-type InGaAs contact layer 6, and an n-type InP layer 7 are crystal-grown in this order.
- a photoresist is formed on the n-type InP layer 7 on the outermost surface.
- an opening of arbitrary shape such as circular or rectangular is formed in the photoresist.
- the opening width is 1.0 ⁇ m or more in diameter, but it is not limited to this range.
- hydrochloric acid is used to remove the n-type InP layer 7 exposed from the opening of the photoresist, exposing the p-type InGaAs contact layer 6 thereunder.
- a single metal containing Au, Pt, Zn, Ge, Ni, Ti, etc., a transparent conductive film, or a combination of these metals is deposited on the p-type InGaAs contact layer 6 and under the n-type InP substrate 1 . is deposited to form a p-type electrode 2 and an n-type electrode 3 .
- the passive portion B where the n-type InP layer 7 is exposed on the outermost surface, is cleaved by scribing in the [110] direction and the [1-10] direction with a diamond cutter to form a two-dimensional array of an arbitrary number of LEDs. Fabricate an LED array.
- the optical semiconductor device according to the present embodiment When the optical semiconductor device according to the present embodiment is junction-down mounted, the same effect as in the first embodiment can be obtained. Further, light generated in the active layer 4 of the active portion A by current injection can be transmitted through the n-type electrode 3 in the Y direction and extracted. At this time, if a hole is partially opened in the n-type electrode 3 to expose the n-type InP substrate 1, or if a transparent conductive film is used as an electrode material, light can be extracted efficiently.
- FIG. 10 is a perspective view showing an optical semiconductor device according to Embodiment 5.
- FIG. FIG. 11 is a cross-sectional view along I-II of FIG.
- a micropillar structure H is formed by etching from the p-type InP cladding layer 5 to below the active layer 4 .
- a buried layer 12 is formed to cover the side surface of the micro-pillar structure H up to a position higher than the active layer 4 .
- Buried layer 12 is a semi-insulating material such as InP doped with Ru or Fe, but may be a combination of semiconductor layers with different carrier concentrations or polarities.
- a p-type InGaAs contact layer 6 is formed on the micro-pillar structure H and the buried layer 12 .
- the passive part B has a buried layer 12, a p-type InGaAs contact layer 6, and an n-type InP layer 7 which are stacked in this order on the n-type InP substrate 1.
- a p-type InP layer may be provided between the p-type InP cladding layer 5 and the buried layer 12 on the outermost surface of the ridge structure D and the p-type InGaAs contact layer 6 .
- Other configurations are the same as those of the fourth embodiment.
- an active layer 4 and a p-type InP clad layer 5 are crystal-grown on an n-type InP substrate 1 in this order.
- a circular or polygonal mask pattern is formed on the p-type InP clad layer 5 .
- etching is performed down to the bottom of the active layer 4 to form a micro-pillar structure H.
- the buried layer 12 is grown to cover the side surface of the micro-pillar structure H up to the active layer 4 .
- a p-type InGaAs contact layer 6 and an n-type InP layer 7 are grown on the buried layer 12 and the p-type InP cladding layer 5 on the outermost surface of the ridge structure to complete the crystal growth process. Subsequent steps are the same as those of the fourth embodiment.
- This embodiment can obtain the effect of the two-dimensional array structure of the fourth embodiment and the effect of the buried layer 12 of the second embodiment.
- the polarities of the substrate and the semiconductor layer may be reversed in Embodiment 1-5. That is, the n-type InP substrate 1 and n-type InP layer 7 may be changed to p-type, and the p-type InP cladding layer 5 and p-type InGaAs contact layer 6 may be changed to n-type.
- a similar laser array can be fabricated and operated in this case as well.
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Abstract
Description
図1は、実施の形態1に係る光半導体装置を示す断面図である。レーザ共振器に対して垂直に交わる水平方向をX、半導体層の積層方向をY、光が伝搬するレーザ共振器方向をZとする。図1はXY平面を示し、図2はYZ平面を示す。本実施の形態では光半導体装置が端面出射型ストライプ構造レーザアレイの場合について説明するが、これに限らず、導波路型の光半導体装置であればLED、光増幅器、光変調器等の場合でも同様の効果を得ることができる。
図4は、実施の形態2に係る光半導体装置を示す断面図である。本実施の形態では光半導体装置が端面出射型埋め込み構造レーザアレイの場合について説明するが、これに限らず、導波路型の光半導体装置であればLED、光増幅器、光変調器等の場合でも同様の効果を得ることができる。
図6は、実施の形態3に係る光半導体装置を示す断面図である。X方向に交互に並んでいるアクティブ部Aとパッシブ部Bの間においてp型InGaAsコンタクト層6から埋め込み層12の下のn型InP基板1までエッチングされて溝部Eが形成されている。アクティブ部A及びその両隣の溝部Eがメサ構造を構成している。溝部Eの内面は絶縁膜13で覆われている。
図8は、実施の形態4に係る光半導体装置を示す斜視図である。基板面に平行な面をXZ平面とし、半導体層の積層方向をY方向とする。n型InP基板1の上において複数のアクティブ部Aが平面視で行列状に形成されている。即ち、複数のアクティブ部AがXZ平面に並んで二次元アレイ構造を構成している。パッシブ部Bが平面視でアクティブ部Aの四方を囲むようにn型InP基板1の上に形成されている。即ち、アクティブ部AのX方向及びZ方向の側面がパッシブ部Bで囲まれている。p型電極2がアクティブ部Aとパッシブ部Bの上に設けられている。n型InP基板1の下面にn型電極3が設けられている。本実施の形態では二次元アレイ構造の例として面発光LEDを取り上げるが、面型光半導体装置であれば面発光レーザ、光増幅器、光変調器等の場合も同様の効果を得ることができる。
図10は、実施の形態5に係る光半導体装置を示す斜視図である。図11は図10のI-IIに沿った断面図である。p型InPクラッド層5から活性層4の下までエッチングされてマイクロピラー構造Hが形成されている。埋め込み層12がマイクロピラー構造Hの側面を活性層4より高い位置まで覆うように形成されている。埋め込み層12は、Ru又はFeをドーピングしたInPなどの半絶縁性材料であるが、キャリア濃度又は極性が異なる複数の半導体層を組み合わせたものでもよい。p型InGaAsコンタクト層6はマイクロピラー構造H及び埋め込み層12の上に形成されている。パッシブ部Bは、n型InP基板1の上に順に積層された埋め込み層12、p型InGaAsコンタクト層6、n型InP層7を有する。リッジ構造Dの最表面のp型InPクラッド層5及び埋め込み層12とp型InGaAsコンタクト層6との間にp型InP層を設けてもよい。その他の構成は実施の形態4と同様である。
Claims (7)
- 第1導電型の半導体基板と、
前記半導体基板の上において第1の方向に沿って交互に並んだアクティブ部及びパッシブ部と、
前記アクティブ部の上に設けられた電極とを備え、
前記アクティブ部は、前記半導体基板の上に順に積層された活性層、第2導電型クラッド層、第2導電型コンタクト層を有し、
前記アクティブ部は、前記第1の方向に直交する第2の方向において前端面と後端面に挟まれた共振器構造となっており、
前記アクティブ部の前記第2導電型コンタクト層は前記電極に接し、
前記パッシブ部は、前記第2導電型コンタクト層と、前記第2導電型コンタクト層の上に設けられた第1導電型層とを有することを特徴とする光半導体装置。 - 前記第2導電型クラッド層から前記活性層の下までエッチングされて前記第2の方向に延びるリッジ構造が形成され、
埋め込み層が前記リッジ構造の側面を前記活性層より高い位置まで覆うように形成され、
前記第2導電型コンタクト層は前記リッジ構造及び前記埋め込み層の上に形成され、
前記パッシブ部は、前記半導体基板の上に順に積層された前記埋め込み層、前記第2導電型コンタクト層、前記第1導電型層を有することを特徴とする請求項1に記載の光半導体装置。 - 前記アクティブ部と前記パッシブ部の間において前記第2導電型コンタクト層から前記埋め込み層の下までエッチングされて溝部が形成され、
前記溝部は絶縁膜で覆われていることを特徴とする請求項2に記載の光半導体装置。 - 第1導電型の半導体基板と、
前記半導体基板の上において平面視で行列状に形成された複数のアクティブ部と、
前記半導体基板の上に形成され、平面視で前記アクティブ部の四方を囲むパッシブ部と、
前記アクティブ部の上に設けられた電極とを備え、
前記アクティブ部は、前記半導体基板の上に順に積層された活性層、第2導電型クラッド層、第2導電型コンタクト層を有し、
前記アクティブ部の前記第2導電型コンタクト層は前記電極に接し、
前記パッシブ部は、前記第2導電型コンタクト層と、前記第2導電型コンタクト層の上に設けられた第1導電型層とを有することを特徴とする光半導体装置。 - 前記第2導電型クラッド層から前記活性層の下までエッチングされてマイクロピラー構造が形成され、
埋め込み層が前記マイクロピラー構造の側面を前記活性層より高い位置まで覆うように形成され、
前記第2導電型コンタクト層は前記マイクロピラー構造及び前記埋め込み層の上に形成され、
前記パッシブ部は、前記半導体基板の上に順に積層された前記埋め込み層、前記第2導電型コンタクト層、前記第1導電型層を有することを特徴とする請求項4に記載の光半導体装置。 - 前記半導体基板、前記第2導電型クラッド層、及び前記第1導電型層はInPからなり、
前記第2導電型コンタクト層はInGaAsからなることを特徴とする請求項1~5の何れか1項に記載の光半導体装置。 - 前記第1導電型層の膜厚は50nm以上であることを特徴とする請求項1~6の何れか1項に記載の光半導体装置。
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JPS53138689A (en) * | 1977-05-06 | 1978-12-04 | Western Electric Co | Method of producing light emitting diode |
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KR20050069340A (ko) * | 2003-12-31 | 2005-07-05 | 엘지전자 주식회사 | 반도체 레이저 다이오드 및 그의 제조방법 |
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JPS53138689A (en) * | 1977-05-06 | 1978-12-04 | Western Electric Co | Method of producing light emitting diode |
JP2000277852A (ja) * | 1999-03-24 | 2000-10-06 | Fuji Xerox Co Ltd | 表面発光型半導体レーザ、及びその製造方法 |
KR20050069340A (ko) * | 2003-12-31 | 2005-07-05 | 엘지전자 주식회사 | 반도체 레이저 다이오드 및 그의 제조방법 |
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