JEE Main 2026 Physics question

Physics Semiconductor Electronics JEE Main 2026

Not in JEE Advanced syllabus

In a semiconductor p-n diode, the doping concentrations on p-side and n-side are 10¹⁵ atoms/cm³ and 10¹⁸ atoms/cm³, respectively. Which one of the following statements is true?

(A)Widths of depletion region on either side of the interface are equal
(B)The depletion region width is more on p-side compared to that in n-sideCorrect
(C)The depletion region width is more on n-side compared to that in p-side
(D)No depletion region forms because of unequal doping concentrations on p and n-sides

Answer: (B)

Solution

Depletion width is inversely proportional to doping concentration; the more lightly doped p-side (10¹⁵) has the wider depletion region.

Question ID VK-015454