PN Junction Information 3 and 5 March 2014
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1 PN Junction Information 3 and 5 March 2014 Charge distribution in the depletion region Electric potential in the depletion region E-field in the depletion region In the p-region In the n-region (due to charge neutrality or E- field continuity) In the p-region In the n-region ), ( n x d x x eN E ) ( p x a x x eN E n d p a x N x N x p a x n d x eN x eN E max 2 ) ( 2 1 p x a x x eN 2 2 1 ) 2 ( 2 1 p x d n x d x eN x x x eN 2 2 2 1 p a n d x bi x N x N e V
description
PN Junction Information 3 and 5 March 2014. Charge distribution in the depletion region. E-field in the depletion region. Electric potential in the depletion region. In the p-region. In the p-region. (due to charge neutrality or E-field continuity). In the n-region. In the n-region. 1. - PowerPoint PPT Presentation
Transcript of PN Junction Information 3 and 5 March 2014
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PN Junction Information3 and 5 March 2014
Charge distribution in the depletion region Electric potential in the
depletion region
E-field in the depletion region
In the p-region
),( nx
d xxeN
E
In the n-region
)( px
a xxeN
E
ndpa xNxN
(due to charge neutrality or E-field continuity)
x
pa
x
ndxeNxeN
E
max
In the p-region
2)(2
1p
x
a xxeN
In the n-region
2
2
1)2(
2
1p
x
dn
x
d xeN
xxxeN
22
2
1pand
xbi xNxN
eV
2
Summary of PN Junction under Equilibrium Condition
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2
1pand
x
bi xNxNe
V
2ln
i
dabi n
NNkTeV
ndpa xNxN
dad
abisn NNN
N
e
Vx
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daa
dbisp NNN
N
e
Vx
12
da
dabispn NN
NN
e
VxxW
2
xp xnW
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The PN Junction and Band Diagram
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