Patent ID: 11894441
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for fabricating high electron mobility transistor (HEMT), comprising:
forming a buffer layer on a substrate;
forming a first barrier layer on the buffer layer;
forming a first hard mask on the first barrier layer;
removing the first hard mask and the first barrier layer to form a recess;
forming a second barrier layer in the recess while the first hard mask is on the first barrier layer and sidewalls of the first hard mask and the second barrier layer are aligned; and
forming a p-type semiconductor layer on the second barrier layer and directly contacting the first hard mask, wherein a topmost surface of the first hard mask is lower than a top surface of the p-type semiconductor layer.