Question

Electrical conduction in a semiconductor takes place due to

• A. electrons only
• B. holes only
• C. both electrons and holes
• D. neither electrons nor holes

Answer 1

The correct option is C both electrons and holes

A semiconductor has two types of charge carriers i.e. holes and electrons. The conductivity of a semiconductor is sum of conductivities of holes and electrons i.e. $\sigma =e{n}_i({\mu }_h+{\mu }_e)$.
where, $n_i$ = intrinsic concentration

${\mu }_h$ = mobility of holes

${\mu }_e$= mobility of electrons
Therefore, electrical conduction in a semiconductor is due to holes and electrons both.