Abstract:
PROBLEM TO BE SOLVED: To provide method of forming a P-type nitride based III-V compound semiconductor layer which can bring an electrode into ohmic contact of low resistance with a P-type nitride based III-V compound semiconductor layer, while restraining generation of surface roughness, cracks, and deterioration of crystallinity of the semiconductor layer. SOLUTION: After a P-type nitride based III-V compound semiconductor layer, e.g. P-type GaN layer 3 is grown by an organic metal chemical vapor deposition method or the like, group II elements such as Mg and Zn are diffused on the surface of the layer 3 by a vapor diffusion method or a solid diffusion method, and a P type diffusion layer 4 is formed. The diffusion of group II elements is performed at, e.g. 500-700 deg.C. Thereby an electrode can be brought into ohmic contact of low resistance with the P-type nitride based III-V compound semiconductor layer, while restraining generation of surface roughness, cracks, and deterioration of crystallinity of the semiconductor layer.
Abstract:
PROBLEM TO BE SOLVED: To provide a nitride-based semiconductor laser element using a semipolar substrate, in which voltage reduction at the time of energization is achieved, resulting in excellent reliability.SOLUTION: A nitride-based semiconductor laser element comprises: a first clad layer composed of InAlGaN (x1>0, y1>0) of a first conductivity type, which is formed on a semipolar surface of a semiconductor substrate; a luminescent layer formed on the first clad layer; and a second clad layer composed of InAlGaN (0≤x2≤0.02, 0.03≤y2≤0.07) of a second conductivity type, which is formed on the luminescent layer.
Abstract:
PROBLEM TO BE SOLVED: To provide a group III nitride semiconductor laser element having a structure capable of reducing malfunction due to Catastrophic Optical Damage (COD) and reducing deterioration in heat dissipation capability.SOLUTION: A group III semiconductor laser element 11 comprises: first and second torn faces 27, 29 serving as a laser resonator and crossing an m-n plane, the torn faces 27, 29 being different from cleavage planes such as c-plane, m-plane and a-plane; a laser waveguide extending in a direction of a cross line of the m-n plane and a semipolar plane 17a; a semiconductor region 19 including first through third regions 19b-19d extending in a direction of a waveguide vector LGV; an insulation film 31 having an opening 31a located on a ridge structure of the third region 19d in the semiconductor region 19; and an electrode 15 including a pad electrode 18 having first through third electrode parts 18b-18d provided on the first through the third regions 19b-19d in the semiconductor region 19, respectively. The first electrode part 18b includes an arm part 18b_ARM1 reaching an edge of the torn face 27.
Abstract:
PROBLEM TO BE SOLVED: To provide a laser diode in which leakage of current can be limited even when it is mounted by junction-down bonding.SOLUTION: A laser diode 10 comprises a semiconductor laminate structure 14 provided on the principal surface 12a of a semiconductor substrate 12 and including an optical resonator extending along the principal surface 12a, and an anode electrode 16 provided on the semiconductor laminate structure 14. Dielectric films 62, 64 are formed on a pair of side surfaces 14a, 14b of the semiconductor laminate structure 14 including a pair of end faces of the optical resonator, respectively. Upper edges 62c, 64c of the dielectric films 62, 64 in the lamination direction of the semiconductor laminate structure 14 extend across the anode electrode 16, and the average roughness of the upper edges 62c, 64c is 0.1-0.5 μm.
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a GaN-based semiconductor light-emitting element that can inhibit lowering in a light extraction efficiency by etching and to provide a semiconductor light-emitting element manufactured by the method.SOLUTION: The semiconductor light-emitting element manufacturing method comprises the steps of: forming a plurality of island-shaped mask layers 150 of a top face of a first upper clad layer 14A; selectively forming a second upper clad layer 14B on the top face of the first upper clad layer 14A at a non-forming region of the plurality of island-shaped mask layers 150 by crystal growth; and filling each of the mask layers 150 by thickly forming the second upper clad layer 14B.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for growing a single-crystal oxychalcogenide system thin film, capable of making grown a proper quality single-crystal oxychalcogenide system thin film having a precipitous interface between thin films. SOLUTION: An amorphous oxychalcogenide system thin film 102 is grown on a substrate 101 comprising a YSZ substrate, a MgO substrate, or the like, by the pulse laser deposition method and the sputtering method, and a single-crystal oxychalcogenide system thin film 103 is formed by crystallizing the amorphous oxychalcogenide system thin film 102 by the reactive solid-phase epitaxial growth method. A crystal oxychalcogenide thin film 104 is grown on the single-crystal oxychalcogenide system thin film 103 by the solution vaporization CVD method from an early phase of the epitaxial growth. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light-emitting element capable of obtaining a light emission wavelength having large light emission intensity, and furthermore having a narrow half-value width. SOLUTION: The light-emitting element 30 is equipped with a light-emitting layer 40 formed on a substrate 31. The light-emitting layer 40 is composed of quantum dots 41 as well as rare earth atoms 43 which is adhered to a surface of the quantum dots 41, and/or contained interior of the quantum dots 41. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a facing target type sputtering apparatus which can easily control the composition of a thin film to be formed and form a desired functional thin film. SOLUTION: The facing target type sputtering apparatus 10 has a sputtering source comprising a plurality of facing target units 3a, 3b and 3c, has a substrate 11 arranged above the facing target units 3a, 3b and 3c, and makes the facing target units 3a, 3b and 3c simultaneously operate to form the thin film on the substrate 11 through sputtering the targets. The facing target units 3a, 3b and 3c have different compositions from each other. The apparatus 10 controls a composition ratio of the thin film by adjusting an array pattern of each of the facing target units 3a, 3b and 3c with respect to the substrate 11 and a voltage applied to each of the facing target units 3a, 3b and 3c. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light emitting diode having extremely high light emitting efficiency by considerably improving extraction efficiency of light while sufficiently acquiring the volume of an active layer, and to provide a method for manufacturing it. SOLUTION: An n-type GaN layer 12, an n-type GaInN buffer layer 14, an n-type GaN layer 15, an active layer 16 of an MQW structure comprising an InGaN well layer and a GaN barrier layer, a p-type AlGaN layer 17, and a p-type GaN layer 18 are epitaxially grown in this order on a sapphire substrate 11 whose one principal surface is made uneven, to form a light emitting diode structure. At this time of growth, a six-sided pyramid-like pit 19 is formed with a part of a threading dislocation 13 formed at an assembling part formed at an upper part of a protruding part 11b of the sapphire substrate 11, as a starting point. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light emitting diode and its manufacturing method made very high in light emission efficiency and made very less in variation in characteristics by improving the extraction efficiency of light, and sharply improving crystallinity of the whole of the nitride-based group III-V compound semiconductor layers constituting a light emitting diode. SOLUTION: After a GaN layer 12 is grown on a saphire substrate 11 subjected to irregularity processing, the GaN layer 12 is left behind only at a bottom of a recess 11a by etching back. A GaN layer 13 is grown on the recess 11a taking the GaN layer 12 as a seed crystal after passing a state where it exhibits a triangle in a cross sectional shape, taking a bottom surface of the recess as a bottom side, to embed the recess 11a. Thereafter, transversal growth is implemented from the GaN layer 13. Further, a GaN-based semiconductor layer including an active layer is grown to form a light emitting diode structure on the GaN layer 13. Using the GaN-based light emitting diode, a light emitting diode backlight or the like is manufactured. COPYRIGHT: (C)2007,JPO&INPIT