20085ee2_1_EE2_HW6_sol

20085ee2_1_EE2_HW6_sol - I At room temperature T=300k, 16...

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Unformatted text preview: I At room temperature T=300k, 16 10 ) 1 1 1 ( )) ( 1 ( = ≈ +- =- =- = + D kT E E D E E D D N e N E f N N F D D And from page 62, we found that E F is several kT beyond E t , and since our recombination center is acceptor like, we can find - t N 15 10 5 1 1 ) ( ⋅ = ≈ + = =- =- t kT E E t E E t t N e N E f N N F T T Thus 15 10 5 ⋅ =- ≈- + t D no N N n cm-3 (acceptor like recombination centers will trap a portion of electrons given out by donors) 4 2 10 2 ⋅ = = no i no n n p cm-3 II s cm s m m kT v n n 11682600 116826 3 * = = = (p85 bottom) s cm s m m kT v p p 16521700 165217 3 * = = = P86 (92) (93) s s cm cm cm v N n n t no 8 2 3 8 10 42 . 3 1 10 42 . 3 1--- ⋅ = ⋅ = = σ τ s s cm cm cm v N p p t po 8 2 3 8 10 21 . 1 1 10 21 . 1 1--- ⋅ = ⋅ = = σ τ Hole (minority carrier) life time = + + = no no po no po p n p n n τ τ τ τ 1 1 p87 (99) Where (fromp85 (90)(91)) = =-- ) ( 1 kT E E c t c e N n = = =----- ) ) ( ( ) ( 1 kT E E E v kT E E v g c t v t e N e N p And c N , p48(11)...
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This note was uploaded on 02/09/2011 for the course EE 2 taught by Professor Vis during the Spring '07 term at UCLA.

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20085ee2_1_EE2_HW6_sol - I At room temperature T=300k, 16...

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