PN Junction Diode, Depletion Layer and Potential Barrier Class 12 Physics – CBSE Board Examination 1. What is a PN Junction? A PN junction is formed when a P-type semiconductor is joined with an N-type semiconductor in such a way that a continuous crystal structure is formed. P-type semiconductor: It is formed by doping a … Continue reading PN Junction Diode, Depletion Layer and Potential Barrier