Patent ID: 7138286

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≦x 3 ≦1, 0≦y 3 ≦1 and 0≦x 3 +y 3 ≦1, 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≦x 1 ≦1, 0≦y 1 ≦1 and 0≦x 1 +y 1 ≦1, on said high carrier concentration layer N + -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<x 2 <1; and forming a contact layer of a P-type conduction, on said P-type layer, said contact layer comprising gallium nitride, wherein an electron concentration of said N + -layer is larger than an electron concentration of said N-layer.