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

The correct option is C $n_p=n_e$ in an intrinsic semiconductor

In an intrinsic semiconductor, number of holes carriers are equal to number of electrons, as no doping is there in the intrinsic material.
In extrinsic materials, due to doping, the numbers of holes and electrons are different.
As, $n_p=n_e$

Hence, $\left(C\right)$ is the correct answer.