Patent ID: 9704968
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A method of forming a high electron mobility transistor (HEMT), the method comprising: epitaxially growing a second III-V compound layer on a first III-V compound layer, wherein a carrier channel is formed between the first III-V compound layer and the second III-V compound layer; forming a cap layer on the second III-V compound layer; after forming the cap layer, forming a source feature and a drain feature on the second III-V compound layer; depositing a protective layer over the source and drain features and the cap layer; etching an opening in the cap layer and the protective layer; depositing a p-type layer on a portion of the second III-V compound layer between the source feature and the drain feature; and forming a gate electrode on a portion of the p-type layer, wherein the depositing the p-layer and the forming the gate electrode includes depositing the p-layer in the opening and forming the gate electrode in the opening.