Q.

Population inversion is obtained at a p-n junction by                      

A. heavy doping of p-type material
B. heavy doping of n-type material
C. light doping of p-type material
D. heavy doping of both p-type and n-type material
Answer» D. heavy doping of both p-type and n-type material
Explanation: population inversion at p-n junction is obtained by heavy doping of both p-type and n-type material. heavy p-type doping with acceptor impurities causes a lowering of the fermi-level between the filled and empty states into the valence band.
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