Q61GATE 2003MCQ

n-type silicon is obtained by doping silicon with

Q62GATE 2003MCQ

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

🚀 Solve in Practice Mode

📖 Explanation

\begin{aligned} n_{i}^{2} &=n p \\ n_{i} &=\text { intrinsic concentration } \\ p &=\frac{n_{1}^{2}}{n}=\frac{1.5 \times 10^{16} \times 1.5 \times 10^{16}}{5 \times 10^{20}} \\ &=45 \times 10^{10}=4.5 \times 10^{11} / \mathrm{cm}^{3} \end{aligned}