High-transconductance self aligned GaAs MESFET using implantation through an AlN layer
Tungsten-silicide-gate self aligned GaAs MESFETs were fabricated on a very thin channel layer formed by implantation through an AlN layer on a semi-insulating GaAs substrate. Transconductance of the through-implanted MESFETs showed a 30 to 50% increase as compared with that of conventional self aligned MESFETs, and reached its maximum value at 300 mS/mm for 1μm-gate-length FETs.