Question

Define deplition layer ,barrier potential, knee voltage

Answer 1

depletion layer is that region where non mobile ions are present ie no mobile charge is there ...and this region is formed due to diffusion of negative and positive ion across pn junction.

barrier potential is the potential drop which is formed as a result of diffusion of ions and then formation of depletion layer ...this potential opposes diffusion of majority charge carriers across pn junction...


knee voltage is the voltage above which V-I graph becomes linear ie current varies linearly with the voltage ...this is the case of reverse biasing...

hope it helps u........................

Answer 2

Knee voltage of a diode is defined as the minimum amount of forward bias required for the diode to show significant conduction. It denotes the potential barrier created across the depletion region via accumulation of charges, i.e. negative charges on P side, and positive on N side. semiconductor-physics.



Integrating the electric field across the depletion region determines what is called the built-in voltage (also called the junction voltage or barrier voltage or contact potential). ... Conduction forces the holes along the direction of the electric field.