In a substance, although the amount of charge on a positive charge-carrier and on a negative charge–carrier may be the same, but the two types of carriers may not give equal contribution to electric current. For example, in a semiconductor, (such as Ge or Si), the two types of charge-carriers are electrons (negative) and holes (positive). When an electric field is applied, the electrons are found to drift more than the holes. We say that the mobility of electrons is more than that of holes.
Mobility (m) of a charged particle in a substance is defined as the drift velocity per unit field applied,
The units of mobility are ‘m/s per V/m’ or m2/Vs.
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