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Mobility of electrons in a semiconductor...

Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconuctor, the density of electrons is `10^(19)m^(-3)` and their mobility is `1.6m^(2)//(V.s)` then the resistivity of te semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to :

A

`4Omegam`

B

`0.4Omegam`

C

`0.2Omegam`

D

`2Omegam`

Text Solution

Verified by Experts

The correct Answer is:
B
`sigma="ne"mu`
`rho=1/("ne"mu)=1/(10^(19)xx1.6xx10^(-19)xx1.6)=1/(2.56)~~0.4Omegam`
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