Question
How does an increase in doping concentration affect the width of depletion layer of a p-n junction diode?
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Answer
Since all the recombination process takes place at the junction or nearby region so depletion width is decreased with doping. In this manner, free electrons and holes reduce the ions. Reduction of positive ions means reduction of depletion region. Thus, the depletion region decreases.
Mathematically: Depletion width is nonlinearly and inversely proportional to the doping;
$\text{W}\propto1(\sqrt{\text{doping}}).$
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