Physics of Semiconductor Devices

Current mechanisms- Exam January 27, 2012

There are four mechanisms that typically cause currents to flow: thermionic emission, diffusion, drift, and tunneling.

Explain briefly which kind of current mechanisms are important in the following devices. (For some devices more than one type of current flows.)

(a) pn diode
(b) Schottky diode
(c) MOSFET
(d) bipolar transistor
(e) JFET
(f) MESFET