When phosphorus and antimony are mixed in germanium,then:

$A$ pure $Si$ crystal has $5 \times 10^{28}$ atoms $m^{-3}$. It is doped with $1 \, ppm$ concentration of pentavalent $As$. The number of holes is (Take $n_i = 1.5 \times 10^{16} \, m^{-3}$)

Which of the following energy band diagrams shows the $N-$ type semiconductor?

In a $P$-type semiconductor,there is

In a $P-$type semiconductor,germanium is doped with

The semiconductors are generally