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If the diffusion capacitance is directly proportional only to the lifetime of holes in N side then ________

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If the diffusion capacitance is directly proportional only to the lifetime of holes in N side then ________

(a) The diode is a p^+n junction diode

(b) The diode is a pn^+ junction diode

(c) The diode is a p^+n^+ diode

(d) The diode can have any type of pn junction

The question was asked in an international level competition.

This interesting question is from Diffusion Capacitance in portion Diode Circuit of Analog Circuits

1 Answer

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Right answer is (a) The diode is a p^+n junction diode

The best I can explain: Diffusion capacitance is proportional to the carrier lifetime of injected minority carriers / excess minority carriers. Since it is proportional to the lifetime of holes in N side, this means the N side is the minority and P side is the majority. Hence it is a p^+n diode.

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