Patent ID: 9559258
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A method, comprising: forming a structure that includes an undoped starter layer, an undoped template layer grown on the undoped starter layer, a first conductive semiconductor layer grown on the undoped template layer, an active layer grown on the first conductive semiconductor layer, and a second conductive semiconductor layer grown on the active layer, wherein the undoped starter layer, the undoped template layer, and the first conductive semiconductor layer have planar surfaces devoid of islanding growth; etching the structure using a first etching process to remove the undoped starter layer and expose the undoped template layer; and etching the structure using a second etching process different from the first etching process to create features that extend into the undoped template layer and the first conductive semiconductor layer, wherein the undoped template layer and the first conductive semiconductor layer having different material characteristics in that the undoped template layer is more durable to the second etching process than the first conductive semiconductor layer.