A semiconductor is known to have an electron concentration of $8\times {10}^{13}$ cm^-3 and a hole concentration of $5\times {10}^2$ cm^-3. The semiconductor is:

1.  n-type

2.  p-type

3.  intrinsic

4.  insulator

Pure Si at 500 K has equal number of electron $\left(n_{\mathit{e}}\right)$ and hole $\left(n_{\mathit{h}}\right)$ concentration of $1.5\times {10}^{\mathrm{16 }}{\mathrm{m}}^{-3}.$ Doping by indium increases $n_{\mathit{h}}$ to $4.5\times {10}^{22}$ ${\mathrm{m}}^{-3}.$ The doped semiconductor is of: