First slide

Classification of semi-conductors

Question

A semiconductor is known to have an electron concentration of $8 \times 10^{13}$ per cm³ and a hole concentration of $5 \times 10^{12}$ per cm³. The semiconductor is

Easy

A

n-type
B

p-type
C

intrinsic
D

None of these

Solution

Given that, Electron concentration $n_{e} = 8 \times 10^{13} per {cm}^{3}$ hole concentration
$\begin{aligned} n_{h} = 5 \times 10^{12} per {cm}^{3} \\ n_{e} > n_{h} \end{aligned}$
number of electrons > number of holes, so it is n - type semiconductor because majority charge carrier is electrons as its concentration is higher than hole.

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