Patent ID: 6777278
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A method of fabricating a high electron mobility transistor (HEMT), comprising:forming a first gallium nitride (GaN) layer on a substrate; forming an aluminum gallium nitride (AlGaN) layer on the first GaN layer; forming a GaN-based segment on the AlGaN layer, the GaN-based segment having an aluminum concentration of less than the AlGaN layer; forming a first ohmic contact to the AlGaN layer adjacent and spaced apart from the GaN segment to provide a source electrode; forming a second ohmic contact to the AlGaN layer adjacent and spaced apart from the GaN segment and opposite first ohmic contact such that the GaN segment is disposed between the first ohmic contact and the second ohmic contact to provide a drain electrode; and forming a non-ohmic contact on the GaN segment to provide a gate contact, the gate contact having a first sidewall which is substantially aligned with the first sidewall of the GaN segment adjacent the source contact and the gate contact extending only a portion of a distance between the first sidewall and a second sidewall of the GaN segment adjacent the second ohmic contact.