Patent ID: 11955541
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for forming a semiconductor device, comprising:
providing a substrate;
forming a buffer layer on the substrate;
forming a channel layer on the buffer layer;
forming a barrier layer on the buffer layer;
forming a first semiconductor gate layer on the barrier layer;
forming a passivation layer on the barrier layer and covering a top surface and sidewalls of the first semiconductor gate layer; and
performing an ion implantation process to form a device isolation region, wherein the device isolation region encloses a first device region of the semiconductor device and extends through the passivation layer and the barrier layer and into at least a portion of the channel layer, a damage concentration of the device isolation region varies along a depth direction, and a depth range of a highest damage concentration covers a depth range of a two-dimensional electron gas layer at a junction between the barrier layer and the channel layer.