1. Can u explain how barrier potential is opposite to the applied voltage in forward bias an why applied voltage decreases in depletion region.

Asked by Prakash | 19th Oct, 2017, 08:33: PM

Expert Answer:

Barrier potential is opposite to the applied voltage because the majority carriers
 are pushed to the opposite sides at PN- junction.
However, the direction of the potential is taken from positive to negative.
At the boundary of the barrier, ions are formed negative on p-side and
positive on n-side which is in opposite direction to the applied voltage.
Applied voltages decrease the depletion region
width by making majority carrier to overcome the barrier.

Answered by Gajendra | 4th Dec, 2017, 01:24: PM