Submicron-Length Tungsten-Gate Self-Aligned GaAs FET

Abstract
A first submicron-gate ion-implanted self-aligned GaAs FET that has ever been made is reported. The FET has a 0.5 µm-long, 0.24 µm-thick tungsten gate which was fabricated by lift-off process and subsequently served as a mask for n+-implantation. The self-aligned FET showed the transconductance 2.4 times as large as that of a conventional FET of the same dimensions. The source-gate breakdown voltage was in excess of –3 V.