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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

I have been asked this question during an internship interview.

Question is taken from Transistor Switching Times topic in portion Transistor Characteristics of Electronic Devices & Circuits

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

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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