Q 12-14-041JEE MainJEE Main 2026 (5 Apr, Shift 2)Easy
In a semiconductor $p$-n diode, the doping concentrations on $p$-side and $n$-side are $10^{15}$ atoms/cm$^3$ and $10^{18}$ atoms/cm$^3$, respectively. Which one of the following statements is true?
Answer: (B) The depletion region width is more on p-side compared to that in n-side
The charge uncovered on the two sides must balance: $N_A x_p = N_D x_n$. The $p$-side is much more lightly doped ($10^{15}$ vs $10^{18}$), so the depletion region extends much further into the $p$-side.
Solution by Sreeraj P, M.Sc Physics