Photodiode working types and applications
Photodiode: Working, Types, and Applications A photodiode is a semiconductor device that converts light into an electrical current. It works on the principle of the photoelectric effect — when photons (light particles) strike the surface of the photodiode, they excite electrons, generating a flow of current. Photodiodes are widely used in optical communication systems, light-sensing devices, and various measurement instruments due to their high sensitivity and fast response. How a Photodiode Works A photodiode is essentially a p–n junction diode designed to operate in reverse bias . When light hits the depletion region of the diode: Photons with sufficient energy break the covalent bonds in the semiconductor material. This generates electron–hole pairs . The electric field in the depletion region separates these charges, producing a current known as photocurrent . The magnitude of the photocurrent is directly proportional to the intensity of incident light, ma...