Patent ID: 7884387
Filing Date: 2011-02-08
Classification: B82Y,H01L,H01S

Abstract:
1. An epitaxial wafer for a semiconductor light emitting device, comprising an n-type GaAs substrate and a plurality of layers stacked on the n-type GaAs substrate, the plurality of layers including at least: an n-type cladding layer formed with a mixed crystal made of an AlGaInP material; an active layer containing a multiple quantum well structure; a p-type Mg-doped cladding layer; a p-type Mg-doped intermediate layer; and a p-type contact layer, which are stacked successively in that order on the n-type GaAs substrate, wherein the p-type contact layer comprises a p-type Mg-doped contact layer and a p-type Zn-doped contact layer, the p-type Mg-doped contact layer is between the p-type Mg-doped cladding layer and the p-type Zn-doped contact layer; and further including a Zn-doped layer between the p-type Mg-doped cladding layer and the p-type Mg-doped intermediate layer, the Zn-doped layer adjusting Zn diffusion into the p-type Mg-doped cladding layer, wherein Zn concentration of the Zn-doped layer is within a range from 1.0×10