Electronic Devices - Special-Purpose Diodes - Discussion

Hot carrier diode or metal semiconductor diode.

Because there is no depletion region in schottky diode as it is combination of metal semiconductor.

So there are abundance of electrons instead of holes so electron-hole recombination is negligible therefore electrons as basically hot carriers (energy suppliers) and so is called hot carrier diode.

The most important difference between the p-n and Schottky diode is reverse recovery time, when the diode switches from conducting to non-conducting state. Where in a p-n diode the reverse recovery time can be in the order of hundreds of nanoseconds and less than 100 ns for fast diodes, Schottky diodes do not have a recovery time, as there is nothing to recover from (i. E. No charge carrier depletion region at the junction). The switching time is ~100 ps for the small signal diodes, and up to tens of nanoseconds for special high-capacity power diodes. With p-n junction switching, there is also a reverse recovery current, which in high-power semiconductors brings increased EMI noise. With Schottky diodes switching essentially instantly with only slight capacitive loading, this is much less of a concern.

Named after German physicist Walter H.Schottky; also known as hot carrier diode.

How can we say it is a hot carrier diode?