Question

With the help of circuit diagrams, briefly explain the reverse biasing of a p-n junction diode.

Answer 1

The positive terminal of the power supply is connected to the n-type material (cathode), and the negative terminal is connected to the p-type material (anode). This configuration creates an external field that aids the internal field E_i, as shown in the diagram. Under this biasing, the holes in the p-region and the electrons in the n-region are pushed away from the junction, causing the depletion layer to widen and increasing the potential barrier, thus stopping the current flow.