Semi conductors

83

Transcript of Semi conductors

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ksiÕ w¾O ikakdhl

Si SiSi

Si

Si

Si SiSi

Si

Si

SiSi

Si Si

Si

Si

Si

Si

Si

Si

Si Si Si Si Si

SiSiSiSiSi

Si SiSi

Si

Si

SiSi

Si Si

Si

Si

Si

Si

Si

Si

Si Si Si Si Si

SiSiSiSiSi

l=yr

Hole

m%;sfrdaOh

WIaK;ajh

ikakdhl;dj

WIaK;ajh

iv iii v

B -

As -

Si -

BSi

As

B SiSi

Si

Si

SiSi

Si Si

l=yr

Hole

fï wdldrhg iEu B mrudKqjla ksidu tla Ok wdfrdams; l=yrhla

ne.ska we;sfõ'

P j¾.fha w¾O ikakdhl iii jk LdKavfha we;s B mrudKqjla Si lene,a,lg tl;= lsrSfuka P

j¾.fha w¾O ikakdhl idod.; yelsh'

Si mrudKq - 1000

B mrudKq - 10

l=yr - 10

WIaK;ajh ksid we;sjk

ksoyia e - 1l=yra - 1

P j¾.fha w¾O ikakdhlhl

nyq;r jdylh - l=yr

w,am;r jdylh - ksoyia e

As SiSi

Si

Si

SiSi

Si Si

ksoyia e h

fï wdldrhg iEu As mrudKqjla ksidu tla ksoyia bf,lafg%daKhla

ne.ska we;sfõ'

n - j¾.fha w¾O ikakdhlv jk LdKavfha we;s As mrudKqjla Si lene,a,lg tl;= lsrSfuka n -

j¾.fha w¾O ikakdhl idod.; yelsh'

Si mrudKq - 1000

As mrudKq - 10

ksoyia e - 10

WIaK;ajh ksid we;sjk

ksoyia e - 1l=yra - 1

n - j¾.fha w¾O ikakdhlhl

nyq;r jdylh - ksoyia ew,am;r jdylh - l=yr

n - j¾.fha w¾O ikakdhlh

nyq;r jdylh - ksoyia ew,am;r jdylh - l=yr

P j¾.fha w¾O ikakdhlh

nyq;r jdylh - l=yr

w,am;r jdylh - ksoyia e

ksoyia el=yr

P j¾.fha iy n - j¾.fha w¾O ikakdhl folla tlg iam¾I jk fia ikaê lsrSfuka vfhdavhla idod .; yelsh'

Junction Diode ikaê vfhdavh

ksoyia el=yr

P j¾.fha iy n - j¾.fha w¾O ikakdhl folla tlg iam¾I jk fia ikaê lsrSfuka vfhdavhla idod .; yelsh'

n - j¾.fha w¾O ikakdhlhlh

nyq;r jdylh - ksoyia ew,am;r jdylh - l=yr

P j¾.fha w¾O ikakdhlhlh

nyq;r jdylh - l=yr

w,am;r jdylh - ksoyia e

ikaêh wi,u ol=Kq me;af;a ;sfnk bf,lafg%daK iaj,amhla jïme;af;a l=yr ;=,g msfrk ksid ikaêh wjg úoHq;a lafIa;%hla we;sfõ'

P w¾O ikakdhlfha ikaêh wi, idfmalaI iDK (-) wdfrdamKhla we;sfõ'

n w¾O ikakdhlfha ikaêh wi, idfmalaI Ok (+) wdfrdamKhla we;sfõ'

Junction Diode ikaê vfhdavh

ksoyia el=yr

ikaêh wi,u ol=Kq me;af;a ;sfnk bf,lafg%daK iaj,amhla jïme;af;a l=yr ;=,g msfrk ksid ikaêh wjg úoHq;a lafIa;%hla we;sfõ'

P w¾O ikakdhlfha ikaêh wi, idfmalaI iDK wdfrdamKhla we;sfõ'

n w¾O ikakdhlfha ikaêh wi, idfmalaI Ok wdfrdamKhla we;sfõ'

Vb úNj ndOlh

ySk ia:rh$ydhs; fmfoi

Junction Diode ikaê vfhdavh

Vb hkq úNj wka;rhls'

Vb úNj ndOlh

ySk ia:rh$ydhs; fmfoi

Si j,ska iE¥ vfhdav i|ydVb = 0.6 V fyda 0.6 V'

Ge vfhdav i|ydVb = 0.2 V fyda 0.3 V'

Junction Diode ikaê vfhdavh

Junction Diode ikaê vfhdavh

ksoyia el=yr

Vb hkq úNj wka;rhls'

Si j,ska iE¥ vfhdav i|ydVb = 0.6 V fyda 0.6 V'

Ge vfhdav i|ydVb = 0.2 V fyda 0.3 V'

fuu ySk ia:rh fyj;a ydhs; fmfofia

wdfrdamKh Q , úNjh V , lafIa;% ;Sj%;dj E , ÿr iu. fjkia jk wdldrh

úNjhlafIa;% ;Sj%;djwdfrdamKh

ÿr

Vb úNj ndOlh

ySk ia:rh$ydhs; fmfoi

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iaùph

ON lrkak'

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ySk ia:rh$ydhs; fmfoi

Vb úNj ndOlh

Vs úNj iemhqu

V fjda,aÜ ógrh

A weógrh

Odrd kshdulh

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Vs úNj iemhqu

V fjda,aÜ ógrh

A weógrh

Odrd kshdulh fjkia lrúNj wka;rh jeä lruq

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Vs úNj iemhqu

V fjda,aÜ ógrh

A weógrh

Odrd kshdulh fjkia lrúNj wka;rh jeä lruq

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Vs úNj iemhqu

V fjda,aÜ ógrh

A weógrh

Odrd kshdulh fjkia lrúNj wka;rh jeä lruq

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Vs úNj iemhqu

V fjda,aÜ ógrh

A weógrhyryd Odrdj .,d hhs

vfhdavhl fmr keUqr

ikaê vfhdavfha úNj ndOlhg jvd jeä úNj wka;rhlaby; wdldrhg

wefkdavhg Ok w.%h o lef;davhg iDK w.%h o jk fia

iïnkaO lsÍfuka vfhdavh yryd úoHq;a Odrdjla .,hs'

Vs

p n

Forward Bias

ySk ia:rh$ydhs; fmfoi

Vb úNj ndOlh

Odrd kshdulhfjkia lrkakf

vfhdavhl miq keUqrReverse Bias

ySk ia:rh$ydhs; fmfoi mq¿,a fõ

Vb úNj ndOlh jeä fõ

Odrd kshdulhfjkia lrkakf

vfhdavhl miq keUqrReverse Bias

Odrd kshdulhfjkia lrkakf

ySk ia:rh$ydhs; fmfoi mq¿,a fõ

Vb úNj ndOlh jeä fõvfhdavhl miq keUqrReverse Bias

ySk ia:rh$ydhs; fmfoi mq¿,a fõ

Vb úNj ndOlh jeä fõ

w¾O ikakdhl w;r ydhs; fmfoi mq¿,a úfuka úNj ndOlhjeä fõ'

vfhdavhl miq keUqrReverse Bias

vfhdavhl miq keUqr

ikaê vfhdavhg úNj wka;rhla by; wdldrhgwefkdavhg iDK w.%h o

lef;davhg Ok w.%h o jk fiaiïnkaO lsÍfuka vfhdavh yryd úoHq;a Odrdjla .,d fkdhhs'

Reverse Bias

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ms<s;=r f;darkak

ms<s;=r f;darkak

(1) A muKla i;H fõ'

(2) B muKla i;H fõ'

(3) C muKla i;H fõ'

(4) B,C muKla i;H fõ'

(5) A,B iy C hk ish,a,u i;H fõ'

ms<s;=r f;darkak

ms<s;=r f;darkak

(1) A muKla i;H fõ'

(2) B muKla i;H fõ'

(3) C muKla i;H fõ'

(4) A ,C muKla i;H fõ'

(5) A,B iy C hk ish,a,u i;H fõ'

ms<s;=r f;darkak

ms<s;=r f;darkak

(1) A muKla i;H fõ'

(2) B muKla i;H fõ'

(3) C muKla i;H fõ'

(4) A ,C muKla i;H fõ'

(5) A,B iy C hk ish,a,u i;H fõ'

ms<s;=r f;darkak

ms<s;=r f;darkak

(1) A muKla i;H fõ'

(2) B muKla i;H fõ'

(3) C muKla i;H fõ'

(4) B ,C muKla i;H fõ'

(5) A,B iy C hk ish,a,u i;H fõ'

ms<s;=r f;darkak

ms<s;=r f;darkak

(1) A muKla i;H fõ'

(2) B muKla i;H fõ'

(3) C muKla i;H fõ'

(4) B ,C muKla i;H fõ'

(5) A,B iy C hk ish,a,u i;H fõ'

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