Patent ID: 8766321
Filing Date: 2014-07-01
Classification: H01L

Abstract:
1. A GaN HEMT comprising: a substrate; a buffer layer comprising a first epitaxial layer on the substrate; a channel comprising a second epitaxial layer on the buffer layer; a top barrier comprising a third epitaxial layer on the second epitaxial layer; a first sidewall dielectric spacer on the third epitaxial layer; a second sidewall dielectric spacer on the third epitaxial layer; a sidewall gate on the third epitaxial layer between the first sidewall dielectric spacer and the second sidewall dielectric spacer; a first ohmic contact for a source separated from the sidewall gate by the first sidewall dielectric spacer; a source contact on the first ohmic contact; a second ohmic contact for a drain separated from the sidewall gate by the second sidewall dielectric spacer; a drain contact on the second ohmic contact; a photoresist over the first ohmic contact, the source contact, the second ohmic contact, and the drain contact such that the first and second sidewall dielectric spacers and the sidewall gate protrude from the photoresist; and a gate head in contact with the sidewall gate, wherein a width of the gate head is wider than a width of the sidewall gate.