Question

In a semiconductor, the concentrations of electrons and holes are $8\times {10}^{18}{\text{/m}}^3$ and $5\times {10}^{18}{\text{/m}}^3$ respectively. The semiconductor is -

• A. p-type.
• B. n-type.
• C. intrinsic.
• D. None of these

Answer 1

The correct option is B n-type.

Given:

$n_e=8\times {10}^{18}{\text{m}}^{-3}$
$n_h=5\times {10}^{18}{\text{m}}^{-3}$

As $n_e>n_h$, the given conductor is of n-type.

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