Patent ID: 6555846
Filing Date: 2003-04-29
Classification: H01L,H01S

Abstract:
A nitride semiconductor device, manufactured by successively forming a group III nitride semiconductor layer (InxGa(1âˆ’xâˆ’y)AlyN (0&lE;x&lE;1, 0&lE;y&lE;1) on a flat surface of a sapphire substrate;a low temperature buffer layer formed on said sapphire substrate; a first gallium nitride layer having a predetermined thickness and a plurality of voids in a surface thereof, and containing no dopant component, said first gallium nitride layer being formed at a first pressure on said low-temperature buffer layer; and a second gallium nitride layer having a second predetermined thickness and containing a dopant component, said second gallium nitride layer being formed at a second pressure on said surface of said first gallium nitride layer and capable of filling in said plurality of voids and flattening said surface of said first gallium nitride layer, wherein said first pressure is higher than said second pressure.