Patent ID: 9553232
Date: 2017-01-24
CPC Classifications: H01L

Claim:
1. A method of forming a vertically conductive UV transparent p-type layer structure, comprising steps: forming a smooth p-type AlGaN layer on a light emitting active-region of a light emitting device via metalorganic chemical vapor deposition at a temperature between 1000-1050° C., wherein the smooth p-type AlGaN layer serves as an electron blocking layer; forming a rough p-type AlGaN layer on the smooth p-type AlGaN layer via metalorganic chemical vapor deposition at a temperature 50-200° C. lower than that of the smooth p-type AlGaN layer so as to form surface protrusions of height 5 to 30 nm, lateral size 10 to 100 nm, and sheet density 10 forming a p-type InGaN layer with an In-composition of 0-10% or a p-type AlGaN layer with an Al-composition of 0-10% on the rough p-type AlGaN layer via metalorganic chemical vapor deposition at a temperature between 800-1000° C., such that a layer of nano-dots is formed with the nano-dots being formed within depressions between the protrusions of the rough p-type AlGaN layer, wherein the nano-dots possess a sheet density of 10 conformally forming a confining p-type AlGaN layer on the p-type InGaN layer or the p-type AlGaN layer via metalorganic chemical vapor deposition to cover the nano-dots.