Physics of Semiconductor Devices

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MESFET

(a) Draw a p-channel MESFET showing the source, drain, and gate. Why is there no body contact?

(b) Draw the band diagram (valence band, conduction band) perpendicular to the gate-semiconductor interface.

(c) Why is a MESFET a fast transistor? What could be done to increase the speed of a MESFET?