EE338_HW4_Solutions

EE338_HW4_Solutions - = = = = = = 64 . 9 400 For 7 . 2 200...

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3/11/2008 1 EE 338 Spring 2008 HW#4 Solutions 1. 3 - 16 19 15 0 cm 10 2 . 1 0259 . 0 215 . 0 exp 10 8 . 2 10 5 so ) ( exp × = ⎛ − × + × = = = d F c c a d N kT E E N N N n 2. type - n cm 10 125 . 1 10 2 10 25 . 2 0 0 3 - 15 5 20 0 2 0 > × = × × = = p n p n n i 3. (a) type - p > d a N N (b) Si: 3 - 7 0 2 0 -3 13 0 cm 10 5 . 1 Then, cm 10 5 . 1 × = = × = = p n n N N p i d a Ge: 3 - 13 0 2 0 3 - 13 2 2 0 cm 10 77 . 1 Then, cm 10 26 . 3 2 2 × = = × = + + = p n n n N N N N p i i d a d a
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3/11/2008 2 GaAs: 3 - 0 2 0 -3 13 0 cm 216 . 0 Then, cm 10 5 . 1 = = × = = p n n N N p i d a 4. (a) n p i p n p n i p n i p n i p i n p i n i p n p n i i i p i n p n i p n n n n en n p e p n e dp d p e p n e p n n p e n e en n e n e p e n e n p n p e n e μ σ = + = = = = + = = + = = + = + = + = = + = = = + = 0 0 2 1 min 0 2 0 2 0 0 0 2 0 2 0 0 0 0 0 0 0 0 0 is (b) part answer to only same the is solution the , using problem the solved you If : NOTE ) ( ) ( 2 2 expression ty conductivi the into ng Substituti (b)) part (Answer to ) 1 ( 0 ty, conductivi minimum the find To Then and (b) ) ( then , material intrinsic an For
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3/11/2008 3 5. (a) mA R V I R s V cm cm N N e A L A L R n d d n 44 . 0 Then 10 136 . 1 / 1100 , 10 5 for 4.3, Figure From and 4 2 3 16 = = Ω × = × = = = μ σ ρ (b) Since Ω × = 3 10 136 . 1 R L R mA R V I 4 . 4 Then = = (c) s cm v cm V E s cm E v cm V E L V E d n d / 10 5 . 5 , / 500 (b), For / 10 5 . 5 And / 50 (a), For 5 4 × = = × = = = = 6. (a) () 3 14 2 n 1 10 26 . 9 / 1350 Assume 5 × = = = = cm N s V cm N e d d n
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3/11/2008 4 (b) cm K T cm K T cm N n s V cm cm N C T s V cm cm N C T C T K T C T K T d n d n d Ω = = Ω = = × = = = =
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Unformatted text preview: = = = = = = 64 . 9 400 For 7 . 2 200 For range, re temperatu over the 10 26 . 9 Assuming 700 10 , 125 2500 10 , 75 4.2, Figure From 125 400 75 200 3 14 2 3 15 2 3 15 D D D D 7. s V cm = + = 2 1 2 1 167 1 1 8. 2 15 16 19 36 . 10 . 10 10 ) 25 ( 10 6 . 1 cm A J x n eD dx dn eD J n n = = = =...
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EE338_HW4_Solutions - = = = = = = 64 . 9 400 For 7 . 2 200...

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