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Chapter 16: Problem 1

a. Describe in your own words how the construction of the hot-carrier diode is significantly different from the conventional semiconductor diode. b. In addition, describe its mode of operation.

Short Answer

Expert verified
A hot-carrier diode is different from the conventional semiconductor diode in terms of its construction, as it has a metal-semiconductor junction instead of a p-n junction. It operates based on the differences in the energy level between the metal and the N-type semiconductor. When voltage is applied, the majority charge carriers (electrons) overcome the Schottky Barrier and move from the semiconductor to the metal, causing a current flow.

Step by step solution

01

Understand the Construction of a Conventional Diode

A conventional semiconductor diode is a two-terminal device that only allows current to flow in one direction. It is comprised of a P-type and N-type semiconductor joined together to form a P-N junction. The P-type semiconductor has an abundance of holes while the N-type has an excess of electrons. When these two semiconductors are joined, a depletion region, void of any charge carriers, forms at the junction.
02

Explaining the construction of a Hot Carrier Diode

A hot carrier diode (also called a Schottky Diode) differs significantly from a conventional diode in its construction. Instead of a p-n junction, it comprises of a metal-semiconductor junction. The metal side behaves like the anode, and the semiconductor behaves like the cathode. The relationship between the metal and the N-type semiconductor forms a Schottky Barrier, known for its fast switching speed and low forward voltage drop.
03

Describing the mode of operation of a Hot Carrier Diode

Operation of a hot carrier diode is based on differences in the energy level between metal and semiconductor material. When voltage is applied, the majority charge carriers, electrons in case of N-type semiconductor, overcome the Schottky Barrier and move from the semiconductor to the metal. This creates a current. In reverse bias, the Schottky Barrier height increases, preventing electron flow thus acting like a perfect open switch, as opposed to normal diodes which leak a small current.

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