Schottky diode is named after its inventor, Dr. Schottky, and SBD is short for Schottky barrier diode (abbreviated SBD). SBD is not made by the principle of PN junction formed by contact between P-type semiconductor and N-type semiconductor, but by the principle of metal-semiconductor junction formed by contact between metal and semiconductor. Therefore, SBD is also known as a metal-semiconductor (contact) diode or surface barrier diode, which is a type of hot carrier diode.