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Switching speed of P+ junction depends on.

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Switching speed of P+ junction depends on.

(a) Mobility of minority carriers in P junction

(b) Life time of minority carriers in P junction

(c) Mobility of majority carriers in N junction

(d) Life time of minority carriers in N junction

This question was posed to me in an interview for internship.

This key question is from PN Diode Switching Times in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Correct option is (d) Life time of minority carriers in N junction

For explanation: Switching leads to move holes in P region to N region as minority carriers. Removal of this accumulation determines switching speed. P+ regards to a diode in which the p type is doped excessively.

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