What is meant by hot carrier?
In general “hot carriers” are particles that attain a very high kinetic energy from being accelerated by a high electric field. These energetic carriers can be injected into normally forbidden regions of the device, as the gate dielectric, where they can get trapped or cause interface states to be generated.
What is drift current in semiconductor?
Drift current is the electric current caused by particles getting pulled by an electric field. The term is most commonly used in the context of electrons and holes in semiconductors, although the same concept also applies to metals, electrolytes, and so on.
What is hot carrier degradation?
The accumulation of damage resulting degradation in device behavior due to hot carrier injection is called “hot carrier degradation”. The useful life-time of circuits and integrated circuits based on such a MOS device are thus affected by the life-time of the MOS device itself.
What is difference between drift current and diffusion current?
Diffusion current = the movement caused by variation in the carrier concentration. Drift current = the movement caused by electric fields. Direction of the diffusion current depends on the slope of the carrier concentration. Direction of the drift current is always in the direction of the electric field.
What is meant by impact ionization?
Impact ionization is the process in a material by which one energetic charge carrier can lose energy by the creation of other charge carriers.
What is called diffusion current?
Diffusion Current is a current in a semiconductor caused by the diffusion of charge carriers (holes and/or electrons). This is the current which is due to the transport of charges occurring because of non-uniform concentration of charged particles in a semiconductor.
How drift current is related to temperature?
Increasing the temperature will obviously decrease the relaxation time – as collisions will become more frequent – and thus decrease the drift velocity. Hence, an increase in the temperature will cause a decrease in the drift velocity.