(a) Differentiate semiconductors, conductors and insulators on the ba…

Question

(a) Differentiate semiconductors, conductors and insulators on the basis of band gap. What is the mechanism by which conduction takes place inside the semiconductor.

(b) Find the conductivity of intrinsic germanium at 300K. If donor type impurity is added to the extent of 1 impurity atom in $10^7$ germanium atoms, find the conductivity. Given that $n_i$ at 300K is $2.5 \times 10^{13}/\text{cm}^3$ and $\mu_n$ and $\mu_p$ in germanium are 3800 and $1800 \text{ cm}^2/\text{V-S}$ respectively.

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