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PN Junction Diodes How do they work? (postponing the math). Chap. 5.2. pn Junction Diode. p Type Material. n Type Material. pn Junction. pn Junction Diode. p Type Material. n Type Material. pn Junction. p Type Material. n Type Material. pn Junction.
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PN Junction Diodes How do they work?(postponing the math)
Chap. 5.2
pn Junction Diode
pType Material
nType Material
pn Junction
pn Junction Diode
pType Material
nType Material
pType Material
nType Material
pn Junction
pn Junction Diode
pType Material
nType Material
ND  NA
ND
x
NA
pn Junction
pn Junction Diode
EC
EC
EF
Ei
Ei
EF
EV
EV
nType Material
pType Material
pn Junction Diode
EC
EC
EF
Ei
Ei
EF
EV
EV
nType Material
pType Material
pn Junction Diode
EC
EC
EF
Ei
Ei
EF
EV
EV
nType Material
pType Material
pn Junction Diode
EC
EC
EF
Ei
Ei
EF
EV
EV
Electrostatic Potential
Builtinpotential
x
pType Material
nType Material
 qVBI
pn Junction Diode
Electrostatic Potential
Builtinpotential
x
Electric Field
x
pn Junction Diode
Charge Density
(NOT Resistivity)
Electric Field
in 1dimension
Relative Permittivity
of Semiconductor
(r)
Permittivity of free space
pn Junction Diode
Electric Field
x
Charge Density
qND
+
+
+
x



qNA
pn Junction Diode
Energy
Potential
Electrical Field
Charge Density
p
n
+

As
B
+
h
–
e
M
M
Metallurgical Junction
(
)
E
x
Neutral pregion
E0
Neutral nregion
Wp
Wn
0
x
–
E
o
V
(
x
)
M
V
Space charge region
o
Wp
Wn
l
o
g
(
n
)
,
l
o
g
(
p
)
p
p
o
x
n
n
o
P
E
(
x
)
n
i
e
V
o
p
Hole Potential Energy PE (x)
o
n
o
n
p
o
x
x
=
0
r
x
n
e
t
M
Electron Potential Energy PE (x)
e
N
d
–
W
–
e
V
p
o
x
pn Junction Principles
W
n

e
N
a