- 10 A Find The Threshold Voltages Of A Conventional And A Delta Doped Heterostructure Aigaas Gaas Fets B Evaluate T 1 (40.6 KiB) Viewed 37 times
10. (a) Find the threshold voltages of a conventional and a delta-doped heterostructure AIGaAs-GaAs FETs. (b) Evaluate the variations of these threshold voltages for two-monolayer fluctuations in AlGaAs layer thickness. Assuming that one monolayer 2 3 Å in AlGaAs, the Schottky barrier height is 0.9 V, the conduction-band discontinuity is 0.3 eV, the uniform doping in the conventional HEFT is 1018 cm' with a thickness of 40 nm, the delta doping is located 40 nm from the metal- semiconductor interface, with a sheet charge density of 1.5*1012 cm-2, and the dielectric permittivity for AIGaAs is assumed to be 10-12 F/cm.