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Questions  

The width of depletion layer is a p-n junction decreases due to 

a
decrease in dope concentration.
b
reverse biasing of p-n junction
c
increase in dope concentration
d
both (1) and (2) are correct.

detailed solution

Correct option is C

Due to increase in dope concentration number of free electrons in the n-region and number of holes in the p-region near the interface of p and n regions increases. Due to this recombination of electron and holes take place in a very narrow region near the interface. As a result thickness of depletion layer decreases.

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