/cm?. The minority carrier lifetime is Tn = 10-6 second at T = 300K. At time t=0 the earth is hit by a mysterious ray that momentarily wipes out all minority carriers whereas majority carriers are unaffected. Assume that the Si wafer is at equilibrium prior to the ray strike. a) What is the electron concentration prior to the ray strike, i.e. at t <0 ? b) What happens after the minority carrier is wiped out? Explain. c) Starting from the appropriate differential equation, derive An (t) for t > 0.

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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Consider that a Si wafer is doped with accept atoms at a concentration of NA = 1016
/em?. The minority carrier lifetime is Tn = 10-6 second at T = 300K. At time t=0 the
earth is hit by a mysterious ray that momentarily wipes out all minority carriers
whereas majority carriers are unaffected. Assume that the Si wafer is at equilibrium
prior to the ray strike.
a) What is the electron concentration prior to the ray strike, i.e. at t<0 ?
b) What happens after the minority carrier is wiped out? Explain.
c) Starting from the appropriate differential equation, derive An (t) for t > 0.
Transcribed Image Text:Consider that a Si wafer is doped with accept atoms at a concentration of NA = 1016 /em?. The minority carrier lifetime is Tn = 10-6 second at T = 300K. At time t=0 the earth is hit by a mysterious ray that momentarily wipes out all minority carriers whereas majority carriers are unaffected. Assume that the Si wafer is at equilibrium prior to the ray strike. a) What is the electron concentration prior to the ray strike, i.e. at t<0 ? b) What happens after the minority carrier is wiped out? Explain. c) Starting from the appropriate differential equation, derive An (t) for t > 0.
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