^Electrical mobility

^Electrical mobility

The drift velocity acquired by a charge carrier in a unit electric field is called its electrical mobility and is denoted by μ. i.e. . Mobility of electrons in the VB is less than the mobility of electrons in the CB.

Current in a SC is,            I = [ve ne + vh nh] e

Conductivity of SC is,      σ = e [ne μe + nh μh],

σSi = 1011 σCu = 10+13sfused quartz

Due to very small number density of charge carriers the conductivity of intrinsic SCs is very low & they are of no practical utility.

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