Patent ID: 7569866

Claim:
A semiconductor light-emitting device, comprising: a light-emitting portion formed on a semiconductor substrate, the light-emitting portion comprising an n-type clad layer, an active layer and a p-type clad layer; an As-based contact layer formed on the light-emitting portion, the contact layer being doped with a p-type dopant of 1×10 19 /cm 3 or more; a current spreading layer formed on the contact layer, the current spreading layer comprising a transparent conductive film of a metal oxide material; and a buffer layer formed between the contact layer and the p-type clad layer or formed being inserted inside of the p-type clad layer, wherein the buffer layer comprises an undoped group III/V semiconductor, and the group III/V semiconductor comprises a group V element comprising P (phosphorus) as a main component thereof.