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.docx

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

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