The following band-energy diagram represents:

In the energy band diagram of a material shown below,the open circles and filled circles denote holes and electrons respectively. The material is a/an

In an $n$-type silicon,which of the following statements is true?

Suppose a pure $Si$ crystal has $5 \times 10^{28}$ atoms $m^{-3}$. It is doped by $1$ ppm concentration of pentavalent $As$. Calculate the number of holes. Given that $n_i = 1.5 \times 10^{16} m^{-3}$.

Which one of the following statements is true? $A$ p-type semiconductor is doped with

In extrinsic $P$ and $N$-type semiconductor materials,the ratio of the impurity atoms to the pure semiconductor atoms is about