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HWSolution7 - ELEN E4301 Introduction to Semiconductor...

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Unformatted text preview: ELEN E4301- Introduction to Semiconductor Devices Spring 2005 Homework Solution Seven 3.5 Platinum to Silicon, 23$“ =5.3.¢V Nat-ID cm} (4- “ID “cm as in problam3l E ~=Ef Kvang/i' =0-205'ev fig; “-74.05 +‘o.zo5' -.= 4455 eV ¢g= —-(§s- -¥M)=to45v (Site P1,.) kl C: W when: K’= A(L~—e’%f= 2. SUN? 0—” F~V}é (a) If Va: 0, C: 2 “Mo 2 0.182. PF 1 Lb) For a 25% reduction , %(°) =0 '15 % (¢-—c—-——:v if 7:19."?5 LVA=<P;(1-c, 1152)=-0.9:3v (a) ohmic meta! to p— type 56 Contact at thermal 2.340. ltbrium Ea $965 EC —- -—Efs (I?) Had“??? contact to F tprQSE 2V rat/Parse bias 3J6 For 0L ngutral contact C§H=§s) Ec“Ef=Z§M“Z%=0-45£V» E - Since Ms minus less {:han. %= 056253 +91% SEHCOH woufd be n~typ.e,. u'. Mal = NC. QXPE— (EC " EfJ/K T] 2-. (mud?) ex? {—fo: } =7,4~'5xto cm 3 71*Sificon - If Md >7.45‘xlo"cm“5 §5<§M and we, obtain 0. 3011023119: ~barrier diode. ' 7E£ ___.______ If Nd<m45xw" up §s>§nm we. obtain / 0L Sahottky ohmic Contact ; HawsMMhfie / doping, commutation £3 30 SW36!” thaw it" woald be impractical . For an ohmic Contact one would dope Urey), Maw-Ely and my on the. formation of a. barrier “that wouH {Mnsmtt cuwzn'ts [9)! tan riding . P—sah’con ($04.05 +a55=4-.6nev . Thus $95.4 for an Values 0f doping, §L_._____________.__ and we. obtain CL Schottky-barrzer 7/ EV . to P-szlccon. / _ // / .31. C4 (0‘) «— 0! Because H501? hg‘ freg- [I C (41“ inversion) (- Co; ’g/ accum Influx I \- l l VG in Uaersion 1| 1. ' 0 O ' 01269110!!! - [JQFLI + .. I on°r£+ (“fibers ad. C. ' ' 1‘9 0) _ The 14 Su n25 +1.: mu. )’ (bift—fi‘f;* fyff-fl- wflf Mal“ 48PM“ invemiorfqo malts fham ‘P‘VW’ 1”“ . . 3 Hm ; .- I h‘ h {m . And ”1me a} (“4.32:9ng menswr n3. 5 3mm 4mm M' *3 3' 8,! (a) n: sm'sw (from Fig. ms) _ 50‘: 1,1612, 0.?2Qv 5&6; Li) Thermal Ewi. (in FlaJ' band E¢-Ef :1: KTlngfi =aWfi-{n I loflldqm (b) P= 13x10 mafiromFia | (5) 9 Eme v=kT£n%-' =002é£n 5 «.011qu U) Thermal Eva“ Ll.” Flour band fig“: ;_;I;— 4,95 2-0.?02V VFB =1 ‘* 0-40 V 3.20%! = 4.30 flag-0538 V ...
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