1. Tardigrade
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  4. If ne is number density of electrons in conduction band and nh is number density of holes in valence band, then for an extrinsic semiconductor at room temperature, (ni=. number density of intrinsic pairs)

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Q. If $n_{e}$ is number density of electrons in conduction band and $n_{h}$ is number density of holes in valence band, then for an extrinsic semiconductor at room temperature, $\left(n_{i}=\right.$ number density of intrinsic pairs)

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

(At room temperature, the density of holes in the valance band is predominantly due to impurity in the extrinsic semiconductor. The electron and hole concentration in a semiconductor in thermal equilibrium is given by
$n_{e} n_{h}=n_{i}^{2}$