Abstract:
PROBLEM TO BE SOLVED: To provide a multibeam semiconductor laser employing a nitride III-V group compound semiconductor, which is driven independently and whose operation before mounting is readily confirmed. SOLUTION: In the multibeam semiconductor laser, having a nitride III-V group compound semiconductor layer, forming a laser structure on one main surface of a substrate 1, and anode electrodes 23, 24 as well as cathode electrodes 20, 21 formed on the same layer, the anode electrode 23 is formed so as to be laid across the cathode electrode 20 through an insulation film 22 while the anode electrode 24 is formed so as to be laid across the cathode electrode 21 through the insulation film 22. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To realize a highly reliable semiconductor light emitting element having good emission characteristics and a long lifetime, a highly reliable semiconductor element having good characteristics and a long lifetime. SOLUTION: At the time of fabricating a semiconductor light emitting element or a semiconductor element by growing a nitride based III-V compound semiconductor layer for forming a light emitting element structure or an element structure on a nitride based III-V compound semiconductor substrate 1 where a plurality of second regions B having a second mean dislocation density higher than a first mean dislocation density are arranged regularly in a first region A of crystal having the first mean dislocation density, an element region 2 is defined on the nitride based III-V compound semiconductor substrate such that the second region B is not included substantially or the second region B is not included in the emission region 2 or the active region.
Abstract:
PROBLEM TO BE SOLVED: To realize a semiconductor light emitting device which restrains electrons from overflowing without impeding an injection of holes into an active layer, is markedly reduced in a drive current and a voltage, and formed of nitride III-V compound semiconductor. SOLUTION: A semiconductor light emitting device is formed of nitride III-V compound semiconductor and has a structure in which an active layer is interposed between an N-type clad layer 5 and a P-type clad layer 10. At least, a cap layer 8 which is of super lattice and composed of barrier layers formed of first nitride III-V compound semiconductor containing Al and Ga and each having a first thickness and well layers formed of second nitride III-V compound semiconductor containing Ga and each having a second thickness that are alternately laminated is provided between the active layer 7 and the P-type clad layer 10.
Abstract:
PROBLEM TO BE SOLVED: To provide a nitride semiconductor, having a large low-defect region on the surface and a semiconductor element using the same, and also to provide a method of manufacturing the nitride semiconductor which enables easy reduction of surface defects in a layer formation process using lateral growth technology, and to provide a method of manufacturing the semiconductor element using the nitride semiconductor. SOLUTION: On a substrate 100, a seed crystal section 105 is formed into a stripe geometry via a buffer layer 100a, and next, a crystal is grown from the seed crystal section 105 in two-stage growing conditions, to form a nitride semiconductor layer 107. In the first stage, a low-temperature growth section 107a, whose cross-sectional shape in the thickness direction is trapezoidal, is formed at a growing temperature of 1,030 deg.C, and in the second stage; a lateral growth is made to progress dominantly at a growing temperature of 1,070 deg.C, to form a high-temperature growth section 107b between the low-temperature growth sections 107a; consequently, on the surface of the nitride semiconductor layer 107, hillocks and normal lattice defects are reduced in sections which are higher than the low-temperature growth sections 107a.
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-beam semiconductor laser device which outputs beams uniform in optical output and is suitably constituted so as to output large high optical power. SOLUTION: This multi-beam semiconductor laser device is a GaN semiconductor laser device having an SCH structure, where laser stripes 44 are provided on a common sapphire board 42, and laser beams are projected from the stripe projection end faces 44a of the laser stripes provided to a cleavage plane vertical to the laser stripes 44. The laser stripes 44 are each of an air ridge type which is current-constricted by an SiO 2 film, a P-side electrode 46 is provided on each ridge, and the laser stripes 44 are formed on a common mesa 45 provided on the sapphire board 42. An N-side electrode 48 is exposed behind the common mesa 45 as a common counter electrode to the P-side electrodes 46, and provided on a contact layer 50 which extends from the rear end face of the laser stripes 44 in the direction of the laser stripes. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor element and its manufacturing method for improving crystallization of nitride-based III-V group compound semiconductor on a sapphire substrate. SOLUTION: After a seed crystal layer 12 with a crystal part 12A made of nitride-based III-V group compound semiconductor crystal and an opening 12B is formed on a sapphire substrate, a recess 11B continuously joined to the opening 12B is formed in the sapphire substrate. An n-side contact layer 15 is grown from the crystal part 12A. As a result, a crystal grown sidewise from the crystal part 12A is prevented from being in contact with the sapphire substrate 11, and the n-side contact layer 15 and the nitride-based III-V group compound semiconductor crystal have a low density of through dislocation while a fluctuation in crystal orientation is made small.
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a semiconductor light-emitting element which uses a nitride-based III-V compound semiconductor and which can achieve good crystallinity of an optical waveguide layer thereby to achieve a long service life.SOLUTION: In manufacturing of a semiconductor laser by sequentially growing an n-type AlGaN clad layer 5, an n-type GaN optical waveguide layer 6, an active layer 7, an undoped GaN optical waveguide layer 17, a p-type AlGaN cap layer 9, a p-type GaN optical waveguide layer 10, a p-type AlGaN/GaN superlattice clad layer 18 and a p-type GaN contact layer, the n-type GaN optical waveguide layer 6, the active layer 7, the undoped GaN optical waveguide layer 17, and the p-type AlGaN cap layer 9 are grown in an Natmosphere, and the p-type GaN optical waveguide layer 10, the p-type AlGaN/GaN superlattice clad layer 18 and the p-type GaN contact layer are grown in a mixed gas atmosphere of Nand H.
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of an organic semiconductor device with which an organic semiconductor device having an excellent organic semiconductor device single crystal membrane/insulating film interface can be manufactured.SOLUTION: A substrate is formed which includes, on one principal surface, a growth control region having a lyophilic surface Sand at least one core formation control region provided on one side of the growth control region while being connected with the growth control region. An unsaturated organic solution resulting from dissolving an organic semiconductor and an organic insulator in a solvent is supplied to the growth control region and the core formation control region of the substrate. The organic insulator in the organic solution is sunk in one principal surface of the substrate, thereby forming a gate insulating film comprised of the organic insulator. Continuously, the solvent of the organic solution is evaporated, thereby growing an organic semiconductor single crystal membrane comprised of the organic semiconductor on the gate insulating film. A source electrode and a drain electrode are formed on the organic semiconductor single crystal membrane.
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor element having a wide low-defect region on the surface and to provide a method for producing a semiconductor element which can easily reduce surface defects in a layer formation step using a lateral growth technique. SOLUTION: A seed crystal layer 201 is grown on a substrate 100, and a growth inhibition layer 216 is formed on the layer 201. That part of the layer 201 which is exposed through the opening of the layer 201 serves as a seed crystal part 215. GaN:Si is grown on the part 215 as a base to form the second seed crystal part 217a. The growth temperature is 1,000°C at the highest. A high-temperature growth part 217b is grown on the part 217a as a base. The growth temperature is 1,050°C at the lowest. The crystal growth proceeds chiefly in the lateral direction to form a continuous unitary layer. Almost no dislocation or crystal defect exists just above the part 217a, and therefore a wide low-defect region is formed on the surface of a nitride semiconductor layer 217. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress the amount of the warping of a substrate below 70 μm when forming the semiconductor layer of a nitride-based III-V group compound on a substrate formed of a substance different from the nitride-based III-group compound. SOLUTION: When the semiconductor layer formed of a nitride-based III-V group compound such as GaN is grown on the substrate such as a sapphire substrate, the thickness x of the substrate is selected so as to satisfy 0 =450 μm with respect to the thickness y of the semiconductor layer of the nitride-based III-V group compound. Under the conditions of the maximum dimension D (cm) of the substrate, the amount of warping of 0 (cm), and z=y/x, D is selected so as to satisfy 0 (1-HCZ), providing that C (cm ) is a proportional constant when the radius ρ (cm) of the curvature of the substrate is expressed to be 1/ρ=CZ.