The PN Junction Diode Explained

Ever wondered how your gadgets control electricity? Meet the PN Junction Diode.

It's made by joining a P-type semiconductor with an N-type semiconductor. At the boundary,

a depletion layer forms, creating an internal barrier. In forward bias,

current flows easily as the barrier narrows down. Flip the voltage to reverse bias,

and the barrier grows, blocking the flow. The V-I characteristic shows this unique

one-way conductivity. The foundation of modern electronics, right in the palm of your

hand.