Chp6. pn Junction Diode: I-V Characteristics II
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1 Ch6. Jucto od: -V Charactrstcs 147
2 rvato Pror 163 Hols o th quas utral -sd For covc s sak, df coordat as, - Th, d h d' '
3 B.C ) ' ( ' / qv L P qv P P P P L q d d q J '/ / 1) ( ' '
4 같은방법으로 165 J '' q q L d d'' ( qv / 1) ''/ L J J P J '' J ' P
5 rvrs saturato currt dal dod quato / qv P P L L q J 1 / qv
6 Eamato of Rsults 167 dal V Udr rvrs bas V <, - Udr forward bas V >, qv / l l q V l qv / q V V l ( )
7 168 Th Saturato Currt 1 Ca chag ordr of magtud ddg o th matrals,.g., S, G, Gas (S) = 1 1 cm -3 (G) = 1 13 cm -3 (S) < (G) by 1 6 For asymmtrcally dod juctos, q L P P dods gral, havly dod sd ca b gord dtrmg th lctrcal charactrstcs of th jucto.
8 Carrr Currts J J - Rfr to Eq. (6.4), (6.6) 169 h L qv h h h L qv L q J L q J ' '' 1 ' 1 ''
9 Carrr Coctratos V, P V, P 17 h L qv L qv '' / ' / 1 '' 1 ' as as
10 171 1 V V log() or log() or - -
11 6.. EVTOS FROM THE EL dal Thory vrsus Ermt brakdow rvrs bas brakdow -5 JUCTO OE : -V CHRCTERSTCS ( μ ) V (volts) Fgur 6.9 Lar lot of th masurd -V charactrstc drvd from a commrcally avalabl S jucto dod matad at room tmratur. Th lot rmts a coars valuato of th dod charactrstc. ot th chag voltag scal gog from forward to rvrs bas. Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
12 (ams) q/ V (volts) () q/..4.6 (ams).8 1. (a) Fgur 6.1 tald lots of th masurd -V charactrstc drvd from a commrcally avalabl S jucto dod matad at room tmratur. Th Fg. 6.9 ad Fg 6.1 charactrstcs ar from th sam dvc. (a) Smlog lot of th forward-bas currt vrsus voltag. (b) Eadd scal lot of th rvrs-bas currt vrsus voltag. (b) -4-5 Slos ovr V V b hgh - lvl jcto q V.35V G/R dlto rgo Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
13 6... Rvrs Bas Brakdow 174 +, + st-jucto dod 에대한 brakdow voltag. 1 V BR 1.75 B B : dog lvl of th lghtly dod sd of th jucto or (cm -3 ) Fgur 6.11 Brakdow voltag as a fucto of th odgrat-sd dog laar + - ad + - stjucto G, S, ad Gas dods. valach s th domat brakdow rocss for dogs abov th dashd l. T = 3K. (ftr Sz [1], c1981 by Joh Wly & Sos, c. Rrtd wth rmsso.) Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
14 Rvrs Bas Brakdow 1 valachg - mact ozato Zr rocss - tulg 175 valachg E c E F E c E F E v E v (a) Small rvrs bas (b) V V BR Fgur 6.1 Carrr actvty sd th dlto rgo of a rvrs-basd jucto dod wh (a) V V BR ad (b) V V BR. Carrr multlcato du to mact ozato ad th rsultat avalach s cturd (b). Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
15 Ma fr ath of lctro ~ 1-6 cm lto rgo wdth ~ 1-4 cm 176 lctros rc thousads of collsos crossg th dlto rgo. at small rvrs bass, rgy loss r collso s small. t larg rvrs bas,.., V V BR rgy loss r collso ozato rgy of smcoductor atom. collso frs a valc lctro coducto bad rat valachg!!
16 177 1 V BR 1 B for, jucto VBR E g 3 V BR T Zr Procss Tulg of carrrs a rvrs basd dod rqurmt for tulg 1 flld stat & mty stat l u o ach sd of th rgy barrr wdth of th rgy barrr d < 1 = 1-6 cm
17 E Partcl Pottal rgy barrr 178 Fgur 6.13 Gral vsualzato of tulg. E c d E v Emty stats E c Fgur 6.14 Flld stats W Barrr E v Vsualzato of tulg a rvrs-basd jucto dod Zr rocss s mortat for dods wth havly dod or rgos Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
18 Th R G Currt 179 dal dod currt dal dod currt R-G currt R-G currt E c E F E T E c E F E T E v dal dod currt E v dal dod currt (a) Rvrs bas (b) Forward bas Fgur Th R-G currt. Vsualzato of th addtoal currt rsultg from (a) rvrs bas grato ad (b) forward bas rcombato th dlto rgo. Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
19 18 ff R G dal dod q. ff qv / 1 RG qv 1 for G - R currt
20 V V b Hgh currt Phoma 181 s V V b, byod th dal assumtos ad aromatos. R s Hgh lvl jcto Srs Rsstac Voltag dro bulk rgo ot glgbl. V J V J V V R S q( V R S )
21 - P V V J R s (a) 18 Fgur 6.16 dtfcato ad dtrmato of th srs rsstac. (a) Physcal org of R S. (b) Forward-bas smlog lot usd to dduc V vrsus. (c) V vrsus lot usd to dduc R S. log() V V Slo-ovr rgo q/ slo Slo=R s (b) V (c) Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
22 Hgh Lvl jcto 183 qv or (log scal) Hgh-lvl jcto log() Causd by hghlvl jcto - (a) q/ slo dal rgo Fgur 6.17 Hgh-lvl jcto. (a) Carrr coctratos udr hgh-lvl jcto codtos. (b) Prdctd ffct o th obsrvd charactrstc. (b) V Fgur rfrc: Smcoductor vc Fudamtals Robrt F. Prrt, ddso-wsly Publchg Comay
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