Patent ID: 7867800

Claim:
A method of producing a light-emitting semiconductor device of a group III nitride compound, comprising: forming an N-layer of an N-type conduction, said N-layer comprising gallium nitride; forming a high carrier concentration N + -layer satisfying the formula (Al x3 Ga 1−x3 ) y3 In 1−y3 N, wherein 0≦x3≦1, 0≦y3≦1 and 0≦x3+y3≦1, and having a thickness of 2 μm-4 μm and an electron concentration of 10 18 /cm 3 order, on said N-layer; forming an emission layer of a group III nitride compound semiconductor satisfying the formula, Al x1 Ga y1 In 1−x1−y1 N, where 0≦x1≦1, 0≦y1≦1 and 0≦x1+y1≦1 on said high carrier concentration layer N + -layer; doping Si and Zn into said emission layer; forming a P-layer of a P-type conduction, on said emission layer, said P-layer comprising aluminum gallium nitride satisfying the formula Al x2 Ga 1−x2 N, wherein 0≦x2≦1; and forming a contact layer of a P-type conduction, on said P-type layer, said contact layer comprising gallium nitride and having a Mg concentration of 10 20 /cm 3 order.