Patent ID: 6165812
Filing Date: 2000-12-26
Classification: C30B,H01L

Abstract:
A method for producing gallium nitride group compound semiconductor, comprising the steps of:forming a polycrystalline nitride layer containing aluminum nitride in a first temperature range on a sapphire substrate by an ECR-CVD or an ECR sputtering method;forming a nucleus layer of gallium nitride single crystals in a second temperature range which is higher than the first temperature range and does not fall below 700.degree. C. or rise above 1000.degree. C. on the polycrystalline nitride layer;growing the nucleus layer of gallium nitride single crystals in a third temperature range which is higher than the second temperature range such that resulting crystals of the nucleus layer of gallium nitride single crystals come into contact with each other in a direction parallel to a surface of the substrate; andgrowing the nucleus layer of gallium nitride single crystals in a fourth temperature range which is similar to the third temperature range in a direction vertical to the surface of the substrate,wherein the third and fourth temperature ranges range between 1000.degree. C. and 1200.degree. C.