Patent ID: 6967359

Claim:
A nitride semiconductor substrate for a device emitting a short wavelength light of 370 nm or less comprising: a single-crystal substrate; a first semiconductor layer made of (0001) face Al x Ga 1-x-y In y N (0≦x≦0.1, 0≦y≦0.5); a plurality of seed crystals each made of Al x Ga 1-x-y In y N (0≦x≦0.1, 0≦y≦0.5) and formed on said semiconductor layer to have a slant surface while being arranged in an equally-spaced stripe pattern; an intermediate layer made of Al a Ga 1-a-b In b N (0.1≦a≦1, 0≦b≦1), and deposited on a whole surface of said seed crystals at low temperature of 300 to 800° C.; and a second semiconductor layer made of Al a Ga 1-a-b In b N (0.1≦a≦1, 0≦b≦1), and formed on said intermediate layer to have a flat surface.