Patent ID: 6586774
Filing Date: 2003-07-01
Classification: B82Y,H01L,H01S

Abstract:
A nitride semiconductor device comprising:an active layer made of a first nitride semiconductor formed on a substrate; a p-type cap layer made of a second nitride semiconductor formed on the active layer; a p-type cladding layer made of a third nitride semiconductor formed on the p-type cap layer; and a p-type contact layer made of a fourth nitride semiconductor formed on the p-type cladding layer, wherein at least one of the p-type cap layer, the p-type cladding layer, and the p-type contact layer has a multilayer structure of one layer made of a first group III nitride and another layer made of a second group III nitride different from the first group III nitride formed on the one layer, the one layer includes no aluminum, the another layer includes aluminum, and the density of a p-type dopant in the another layer is higher than the density of a p-type dopant in the one layer, and the density of the p-type dopant locally increases in an area of the another layer near the interface with the one layer on the substrate side.