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Compared to a PN junction with NA=10^14/CM^3, which one of the following is true for NA=ND= 10^20/CM^3?(a) depletion capacitance decreases(b) depletion capacitance increases(c) depletion capacitance remains same(d) depletion capacitance can’t be predictedI have been asked this question during a job interview.This interesting question is from Diode Capacitances in section Semiconductor-Diode Characteristics of Electronic Devices & Circuits

Answer»

Right answer is (b) depletion capacitance increases

To EXPLAIN I would SAY: We know, CT=Aε/W and

W ∝ (1/NA+1/ND)^ 1/2. So, CT∝ (1/NA+1/ND)^-1/2

So when NA and ND increases, depletion capacitance CT increases.


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