Question

Define mobility of charge carrier. Write relations between electric current and mobility for (a) a conductor and (b) a semiconductor. Hence write an expression for the conductivity of a semiconductor.​

Answer 1

Explanation:

The mobility of a charge carrier is defined as the drift velocity of the charge carrier per unit electric field.

Thus, mobility , μ=

E

v

d

If q be the charge of carrier and τ be the relaxation time, then mobility μ=

m

qτ

where m be the mass of the charge carrier.