Abstract:
PROBLEM TO BE SOLVED: To stably transport an organic material in a vapor phase state. SOLUTION: A material gas is produced by evaporating or sublimating the organic material 9 by an evaporating sublimating chamber 4. The material gas is mixed with a carrier gas in a material gas chamber 5, and transported to a film forming chamber 7 by means of a material gas transport tube 6. The material gas transport tube 6 is provided with a fan 2. The fan 2 generates a flow of the material gas from the material gas chamber 5 to the film forming chamber 7, and promotes the transport of the material gas. The material gas transported to the film forming chamber 7 is adsorbed to a base 3 to form an organic film. As the material gas is stably supplied in forming the organic film, a deposition rate can be stabilized. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To adsorb an organic raw material to an entire surface of a substrate without providing any mechanically movable part. SOLUTION: A substrate supporting base 4 is fixed to a top part of a vacuum chamber 2, and a substrate 3 is supported thereby. A plurality of evaporation sources 5 are continuously arranged in one row facing the substrate 3, and a first gas introducing pipe 6a and a second gas introducing pipe 6b are disposed facing each other across the evaporation sources 5. A raw material gas generated in the evaporation sources 5 rises toward the substrate 3. When the gas is alternately discharged from the first gas introducing pipe 6a and the second gas introducing pipe 6b, the gas flow is oscillated in the right-to/from-left direction, and the raw material gas reaches the entire surface of the substrate 3. A uniform organic film is formed over the entire surface of the substrate 3 thereby even when the substrate 3 is fixed. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a nitride semiconductor light-emitting element which has such current constriction structure as different from a conventional air-ridge type nitride semiconductor light-emitting element to provide a low threshold current value, with large lateral refractive-index difference, having such a structure as easily manufactured. SOLUTION: A nitride III-V compound semiconductor laser element 50 has a laminated structure in which an n-GaN contact layer 54, n-Al 0.08 Ga 0.92 N clad layer 56, n-GaN guide layer 58, MQW active layer p-GaN guide layer 62, p-Al 0.07 Ga 0.93 N clad layer 64, and p-GaN contact layer 64 are sequentially formed on a sapphire substrate 52. An non-dope Al 0.3 Ga 0.7 N current constriction layer 68 whose film thickness is 0.3 μm is formed parallel to a substrate surface in direction of substrate or direction, in a region except for a striped current injection region 70 between the p-GaN guide layer and p-AlGaN clad layer. The AlGaN current constriction layer comprises ä11-22} surface or an epitaxial growth surface 68a of ä1-101}, on the current injection region side. COPYRIGHT: (C)2003,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 the major surface of 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 the crystal having the first mean dislocation density, the nitride based III-V compound semiconductor layer is prevented from coming into direct contact with the second region B on the major surface of the nitride based III-V compound semiconductor substrate.
Abstract:
PROBLEM TO BE SOLVED: To manufacture easily and in a simple process nitride based III-V compound semiconductor substrates on which nitride based III-V compound semiconductor layers exhibiting a low defect density and a high quality can be grown, and to manufacture high-performance and long-life semiconductor devices by using them. SOLUTION: A nitride based III-V compound semiconductor mixed crystal layer such as an n-type AlGaN layer 23 is grown on a substrate such as a (c) surface sapphire substrate 21 and is patterned to form a seed crystal. By using the seed crystal, a nitride based III-V compound semiconductor layer such as an n-type GaN layer 24 is grown in a lateral direction to manufacture a nitride based III-V compound semiconductor substrate such as an n-type GaN substrate. By using the nitride based III-V compound semiconductor substrate and by growing a nitride based III-V compound semiconductor layer on it, a semiconductor device such as a semiconductor laser is manufactured.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for growing a nitride based III-V compound semiconductor layer which can produce a nitride based III-V compound semiconductor substrate having good crystallinity and no surface roughness nor crack with high productivity. SOLUTION: A thin GaN layer 2 is grown rate of 4 μm/h or less on a c-face sapphire substrate 1 by MOCVD or MBE, and then a sufficiently thick GaN layer 3 is grown on the GaN layer 2 at a rate higher than 4 μm/h but not higher than 200 μm/h by hydride VPE. Subsequently, the c-face sapphire substrate 1 is removed by etching or lapping to obtain a GaN substrate comprising the GaN layers 2, 3. Finally, the surface of the GaN layer 2 or 3 being used as a growth surface is etched or polished to bring about a high quality surface state.
Abstract:
PROBLEM TO BE SOLVED: To reduce the contact resistance of an electrode that is provided on II-VI compound semiconductor layer, by growing the II-VI compound semiconductor layer and then performing treatment in an atmosphere including at least nitrogen before forming the electrode. SOLUTION: An n-type GaAs substrate 1 where the growth of II-VI compound semiconductor layer is completed is retained on a susceptor 32, an RF coil 33 is energized and the n-type GaAs substrate 1 is heated to, for example, 330 deg.C, the temperature is retained for a desired amount of time, and then hydrogen annealing is made. In this case, the hydrogen annealing temperature is sat to a relatively high value of 330 deg.C to obtain an effect due to hydrogen annealing fully and at the same time to clean the surface of a p-type ZnSe contact layer due to a risk of contaminating the surface of the p-type ZnSe contact layer, since the n-type GaAs substrate 1 is exposed to atmosphere during transportation. After that, a p-type electrode or an n-type electrode is formed.
Abstract:
PROBLEM TO BE SOLVED: To provide a nitride-based semiconductor laser element using a semi-polar substrate, which inhibits deterioration of oscillation characteristics caused by a ridge structure and which has excellent reliability.SOLUTION: A semiconductor laser element manufacturing method comprises forming an insulation layer 12 formed at a side 18a of a ridge part of an epitaxial layer 2 and on a surface of a lateral face 18b of the ridge part, in such a manner as to cover at least a part of a lateral face of a first electrode (p-side electrode) 14 formed from the epitaxial layer 2 side to a top face of the ridge part 18. By doing this, a pad electrode 13 is prevented from directly contacting the epitaxial layer 2.
Abstract:
PROBLEM TO BE SOLVED: To provide a gallium nitride semiconductor laser element and a gallium nitride semiconductor laser element manufacturing method, which reduce a threshold current.SOLUTION: A gallium nitride semiconductor laser element comprises: an n-type clad layer 15b; an n side optical guide layer 29; an active layer 27; a p side optical guide layer 31; and a p-type clad layer 23. An oscillation wavelength of the active layer 27 is 400 nm or more and 550 nm or less. The n-type clad layer 15b is composed of InAlGaN (0
Abstract:
PROBLEM TO BE SOLVED: To provide a group III nitride semiconductor laser element having a structure capable of improving oscillation yield.SOLUTION: An end face 17c of a supporting substrate 17 and an end face 19c of a semiconductor region 19 appear in a first torn surface 27 and a second torn surface 29, respectively. A laser structure 13 includes a first and second surfaces 13a and 13b, and the first surface 13a is the opposite surface to the second surface 13b. Each of the first and second torn surfaces 27 and 29 extends from the edge of the first surface 13a to the edge of the second surface 13b. The semiconductor region 19 includes an InGaN layer 24. The semiconductor region 19 can include the InGaN layer 24. The torn surface 29 includes a step 26 provided on an end face 24a of the InGaN layer 24. The step 26 extends in the direction from one side surface 22a to the other side surface 22b of a group III nitride semiconductor laser element 11. The step 26 can be formed in a portion or the whole of the end face 24a of the InGaN layer 24 in each of the torn surfaces 27 and 29.