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

Claim 11:
12. A gallium nitride heterojunction field effect transistor device comprising:
a semiconductor substrate that includes a gallium nitride layer, an upper surface, and a channel;
a first dielectric layer disposed over the upper surface of the semiconductor substrate;
an active region defined by an isolation region, formed within the semiconductor substrate;
a source electrode and a drain electrode formed over the semiconductor substrate within openings formed in the first dielectric layer in the active region, wherein the source electrode and the drain electrode are electrically coupled to the channel;
a gate electrode formed over the semiconductor substrate and disposed between the source electrode and the drain electrode and over the first dielectric layer, wherein the gate electrode is electrically coupled to the channel;
a first field plate formed over the first dielectric layer, electrically insulated from and adjacent the gate electrode between the gate electrode and the drain electrode, forming a first metal-insulator-semiconductor region under the first field plate;
a second dielectric layer disposed over the gate electrode and over the first field plate; and
a second field plate disposed 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, forming a second metal-insulator-semiconductor region under the second field plate between the gate electrode and the first field plate, and a third metal-insulator-semiconductor region under the second field plate, adjacent the first field plate and between the first field plate and the drain electrode.