Patent ID: 11923424
Assignee: NXP B.V.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method of fabricating a gallium nitride heterojunction field effect transistor device comprising:
forming a semiconductor substrate that includes a gallium nitride layer, an upper surface, and a channel;
forming a first dielectric layer over the upper surface of the semiconductor substrate;
forming a source electrode and forming a drain electrode over the semiconductor substrate within openings formed in the first dielectric layer, wherein the source electrode and the drain electrode are electrically coupled to the channel;
forming a gate electrode over the semiconductor substrate between the source electrode and the drain electrode and over the first dielectric layer;
forming a first field plate over the first dielectric layer, electrically insulated from and adjacent the gate electrode between the gate electrode and the drain electrode;
forming a second dielectric layer over the gate electrode and over the first field plate; and
forming a second field plate over the second dielectric layer and over the first field plate, wherein a portion of the second field plate is below an upper surface of the first field plate between the gate electrode and the first field plate.