摘要:
A method of forming a III-V nitride homoepitaxial layer on a corresponding III-V nitride material substrate, comprising depositing the III-V nitride homoepitaxial layer by a VPE process using Group III source material and nitrogen source material under deposition conditions including V/III ratio in a range of from about 1 to about 10 5 , nitrogen source material partial pressure in a range of from about 1 to about 10 3 torr, growth temperature in a range of from about 500 to about 1250 degrees Celsius, and growth rate in a range of from about 0.1 micron per hour to about 500 microns per hour.
摘要:
A mass transport process for use in the manufacture of semiconductor devices, particularly but not exclusively low threshold semiconductor lasers in the InP/InGaAsP system, involves the arrangement of a cover wafer (18) of the material to be grown adjacent to a semiconductor wafer (15) on which the material is to be grown, their disposition together with a crystalline alkali halide (20) in a crucible (16), and heating the crucible, which is almost but not completely sealed, in a hydrogen stream. For the manufacture of InP/InGaAsP lasers and the growth of InP, the alkali halide may comprise KI, Rbl or Csl and a controlled amount of In metal (21) may be optionally contained in the crucible (16) to control the balance between growth of InP for defining the laser active region and erosion of InP from other areas of the wafer. Growth is achieved at temperatures comparable with liquid phase epitaxy processing temperatures.
摘要:
A method of forming a III-V nitride homoepitaxial layer on a corresponding III-V nitride material substrate, comprising depositing the III-V nitride homoepitaxial layer by a vapor phase epitaxy process using Group III source material and nitrogen source material, said method further comprising one of the following: (i) coating a susceptor surface with a corresponding III-V nitride material prior to reposing the substrate thereon for said depositing step; (ii) annealing the substrate in an ambient prior to said depositing step at a temperature > 600 degrees Celsius to relieve strain in the layer, with the ambient of the anneal being different from ambient of said depositing step to protect the substrate surface and promote substrate strain relaxation; (iii) subjecting the substrate to a mass transport smoothing of a growth surface of said substrate; and (iv) conditioning the substrate by oxidation in O 2 , air, an air/inert gas mixture, or a wet mixture to create a thin oxide layer, and stripping the oxide layer in an alkali solution or etch removing same, to remove potential impurities from the substrate.
摘要:
A homoepitaxial III-V nitride article, comprising a III-V nitride homoepitaxial layer deposited on a free-standing III-V nitride material substrate, wherein said III-V nitride homoepitaxial layer has a dislocation density of less than 1E6 dislocations per square centimeter, and the article comprises one of the following features: (i) oxidized material is provided between the III-V nitride homoepitaxial layer and the free-standing III-V nitride material substrate; (ii) an epi interlayer is provided between the III-V nitride homoepitaxial layer and the free-standing III-V nitride material substrate; and (iii) the free-standing III-V nitride material substrate is offcut, and the III-V nitride homoepitaxial layer comprises non-(0001) homoepitaxial step flow crystal growth.
摘要:
A III-V nitride homoepitaxial microelectronic device structure comprising a III-V nitride homoepitaxial epi layer on a III-V nitride material substrate, e.g., of freestanding character. Various processing techniques are described, including a method of forming a III-V nitride homoepitaxial layer on a corresponding III-V nitride material substrate, by depositing the III-V nitride homoepitaxial layer by a VPE process using Group III source material and nitrogen source material under process conditions including V/III ratio in a range of from about 1 to about 105, nitrogen source material partial pressure in a range of from about 1 to about 103 torr, growth temperature in a range of from about 500 to about 1250 degrees Celsius, and growth rate in a range of from about 0.1 to about 500 microns per hour. The III-V nitride homoepitaxial microelectronic device structures are usefully employed in device applications such as UV LEDs, high electron mobility transistors, and the like.