Exam 3 Solutions

# Hint begin with the general expression and simplify

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Unformatted text preview: have a Coulombic attraction for minority carrier electrons, which increases their electron capture cross section and lowers the lifetime. 1b) Compute the low ­injection, minority electron lifetime due to band ­to ­band (radiative) recombination. Hint: begin with the general expression and simplify for low ­injection. #n !n from R = we see that ! R = (1 / BN A ) R = B np ! ni2 " B#nN A = "R (1 / BN A ) ( !R = ) 1 1 = = 0.5 " 10#10 sec. #10 20 BN A 2 " 10 10 ( ! R = 50 picoseconds )( ) 1c) Compute the low ­injection, minority electron lifetime due to Auger recombination. Hint: begin with the general expression and simplify for low ­injection. #n 2 R = Cn n + C p p np ! ni2 " C p p 2 n = C p N A #n = 2 1/ C...
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## This note was uploaded on 01/15/2014 for the course ECE 606 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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