Patent ID: 11888053
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A field-effect transistor comprising:
a buffer layer, a channel layer, a barrier layer, a carrier supply layer, and an ohmic cap layer on a semiconductor substrate;
a first source electrode and a first drain electrode formed on the ohmic cap layer, wherein the first drain electrode is spaced apart from the first source electrode along a gate length direction;
an insulating layer on the ohmic cap layer between the first source electrode and the first drain electrode;
a first gate opening in the insulating layer between the first drain electrode and the first source electrode, wherein a distance of the first gate opening from the first drain electrode is greater than a distance of the first gate opening from the first source electrode;
a plurality of first asymmetric openings in the insulating layer between the first gate opening and the first drain electrode;
a first recess region below the first gate opening and the plurality of first asymmetric openings; and
a first gate electrode on the insulating layer and disposed in the first gate opening and the first recess region, wherein the first gate electrode is joined to the barrier layer through a first Schottky junction, wherein each of the plurality of first asymmetric openings is arranged such that an opening size thereof in the gate length direction is greater than an opening size thereof in a gate width direction, the gate width direction being perpendicular to the gate length direction.