The electron density of intrinsic semiconductor at room temperature is $10^{16} \mathrm{~m}^{-3}$. W

Question

The electron density of intrinsic semiconductor at room temperature is $10^{16} \mathrm{~m}^{-3}$. When doped with a trivalent impurity, the electron density is decreased to $10^{14} \mathrm{~m}^{-3}$ at the same temperature. The majority carrier density is

Professor PC Thomas Classes · Answer

(b) : For intrinsic semiconductor, $n_i=n_e=10^{16} \mathrm{~m}^{-3}$ For doped semiconductor, $n_i^2=n_e n_h$ \ $ 	herefore \quad n_h=\frac{n_i^2}{n_e}=\frac{\left(10^{16} \mathrm{~m}^{-3}ight)^2}{10^{14} \mathrm{~m}^{-3}}=10^{18} \mathrm{~m}^{-3} $