Patent ID: 11929431
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A high electron mobility transistor (HEMT), comprising:
a first III-V compound layer;
a second III-V compound layer disposed on the first III-V compound layer, wherein the composition of the first III-V compound layer and the composition of the second III-V compound layer are different from each other;
a shallow recess, a first deep recess and a second deep recess disposed in the second III-V compound layer, wherein the first deep recess and the second deep recess are respectively disposed at two sides of the shallow recess, and the second III-V compound layer between the shallow recess and the second deep recess has a second top surface;
a source electrode filling in the first deep recess and contacting a top surface of the first III-V compound layer, wherein the second III-V compound layer between the shallow recess and the first deep recess has a first top surface, and the source electrode directly contacts the first top surface, wherein the source electrode comprises:
a source body layer, wherein the source body layer fills in the first deep recess, contacts the top surface of the first III-V compound layer, and does not contact the first top surface of the second III-V compound layer; and
a source extension layer directly contacting the first top surface of the second III-V compound layer and only disposed between the first deep recess and the shallow recess, wherein the source extension layer only has an end connects to a sidewall of the source body layer;

a drain electrode filling in the second deep recess and contacting the top surface of the first III-V compound layer, wherein a shape of the source electrode and a shape of the drain electrode are different from each other; and
a gate electrode disposed on the shallow recess.