半导体物理与器件第四版课后习题答案4.docx
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半导体物理与器件第四版课后习题答案4
Chapter4
4.1
where
and
arethevaluesat300K.
(a)Silicon
(K)
(eV)
(cm
)
(b)Germanium(c)GaAs
(K)
(cm
)
(cm
)
_______________________________________
4.2
Plot
_______________________________________
4.3
(a)
Bytrialanderror,
K
(b)
Bytrialanderror,
K
_______________________________________
4.4
At
K,
eV
At
K,
eV
or
or
eV
Now
so
cm
_______________________________________
4.5
For
K,
eV
For
K,
eV
For
K,
eV
(a)For
K,
(b)For
K,
(c)For
K,
_______________________________________
4.6
(a)
Let
Then
Tofindthemaximumvalue:
whichyields
Themaximumvalueoccursat
(b)
Let
Then
Tofindthemaximumvalue
Sameaspart(a).Maximumoccursat
or
_______________________________________
4.7
where
and
Then
or
_______________________________________
4.8
Plot
_______________________________________
4.9
Plot
_______________________________________
4.10
Silicon:
eV
Germanium:
eV
GalliumArsenide:
eV
_______________________________________
4.11
(K)
(eV)
(
)(eV)
_______________________________________
4.12
(a)
meV
(b)
meV
_______________________________________
4.13
Let
constant
Then
Let
sothat
Wecanwrite
sothat
Theintegralcanthenbewrittenas
whichbecomes
_______________________________________
4.14
Let
for
Then
Let
sothat
Wecanwrite
Then
or
Wefindthat
So
_______________________________________
4.15
Wehave
Forgermanium,
Then
or
Theionizationenergycanbewrittenas
eV
eV
_______________________________________
4.16
Wehave
Forgalliumarsenide,
Then
Theionizationenergyis
or
eV
_______________________________________
4.17
(a)
eV
(b)
eV
(c)
cm
(d)Holes
(e)
eV
_______________________________________
4.18
(a)
eV
(b)
eV
(c)
cm
(d)
eV
_______________________________________
4.19
(a)
eV
eV
(b)
cm
(c)p-type
_______________________________________
4.20
(a)
eV
cm
eV
cm
(b)
eV
eV
cm
_______________________________________
4.21
(a)
eV
cm
eV
cm
(b)
eV
eV
cm
_______________________________________
4.22
(a)p-type
(b)
eV
cm
eV
cm
_______________________________________
4.23
(a)
cm
cm
(b)
cm
cm
_______________________________________
4.24
(a)
eV
(b)
eV
(c)
cm
(d)Holes
(e)
eV
_______________________________________
4.25
eV
cm
cm
cm
(a)
eV
(b)
eV
(c)
cm
(d)Holes
(e)
eV
_______________________________________
4.26
(a)
cm
eV
cm
(b)
eV
cm
cm
eV
eV
cm
_____________________________________
4.27
(a)
cm
eV
cm
(b)
eV
cm
cm
eV
eV
cm
_______________________________________
4.28
(a)
For
Then
cm
(b)
cm
_______________________________________
4.29
So
Wefind
eV
_______________________________________
4.30
(a)
Then
cm
(b)
cm
_______________________________________
4.31
Fortheelectronconcentration
TheBoltzmannapproximationapplies,so
or
Define
Then
Tofindmaximum
set
or
whichyields
Fortheholeconcentration
UsingtheBoltzmannapproximation
or
Define
Then
Tofindmaximumvalueof
set
Usingtheresultsfromabove,
wefindthemaximumat
_______________________________________
4.32
(a)Silicon:
Wehave
Wecanwrite
For
eVand
eV
wecanwrite
or
cm
Wealsohave
Again,wecanwrite
For
and
eV
Then
or
cm
(b)GaAs:
assume
eV
Then
or
cm
Assume
eV
Then
or
cm
_______________________________________
4.33
Plot
_______________________________________
4.34
(a)
cm
cm
(b)
cm
cm
(c)
cm
(d)
cm
cm
cm
(e)
cm
cm
cm
_______________________________________
4.35
(a)
cm
cm
(b)
cm
cm
(c)
cm
(d)
cm
cm
cm
(e)
cm
cm
cm
_______________________________________
4.36
(a)Ge:
cm
(i)
or
cm
cm
(ii)
cm
cm
(b)GaAs:
cm
(i)
cm
cm
(ii)
cm
cm
(