PN Junction Basics

Depletion region, built-in potential.

Darshan N
Updated: 19 March 2026
6 min read

PN Junction Basics Quiz

Test your understanding of depletion region formation and built-in potential in PN junctions.

Question 1 of 3

Q1.The built-in potential V_bi of a PN junction is given by V_bi = (kT/q) * ln(N_A * N_D / n_i^2). At thermal equilibrium, this potential: