The intrinsic carrier concentration of silicon sample at $300 \mathrm{~K}$ is $1.5 \times 10^{16} / \mathrm{m}^3$. If after doping, the number of majority carriers is $5 \times 10^{20} / \mathrm{m}^3$, the minority carrier density is
- $4.50 \times 10^{11} / \mathrm{m}^3$
- $3.33 \times 10^4 / \mathrm{m}^3$
- $5.00 \times 10^{20} / \mathrm{m}^3$
- $3.00 \times 10^{-5} / \mathrm{m}^3$