Question

Let $n_{P}$ and $n_{e}$ be the number of holes and conduction electrons respectively in a semiconductor. Then

• A. $n_{P} > n_{e}$in an intrinsic semiconductor
• B. $n_{P} = n_{e}$in an extrinsic semiconductor
• C. $n_{P} = n_{e}$in an intrinsic semiconductor
• D. $n_{e} > n_{P}$in an intrinsic semiconductor

Answer 1

Answer: (C)

$n_{P} = n_{e}$in an intrinsic semiconductor

Answer 2

In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy has created one hole. Thus in intrinsic semiconductors n_e = n_h.