2024年3月28日发(作者:黄华奥)
班級: 學號: 姓名:
1. 計算鋁中每立方米原子數目。(鋁原子量:27g/mole;密度:2.71g/ cm
3
)
答:
N =
N
A
Al
A
Al
6.023 x 10
23
atoms/mol
2.71 g/cm
3
N =
26.98 g/mol
223283
= 6.05 x 10 atoms/cm = 6.05 x 10 atoms/m
2.碳在鎳中擴散係數予以之的兩個部同溫度時如下圖所示:
(a)決定D
0
和 Q
d
的值
T(
c
)
(b)在850
c
時,D的大小為何?
600
lnD
1
lnD
2
答:
Q
d
=R
11
T
1
T
2
-14-13
(8.31 J/mol-K)
ln 5.5 x 10 ln 3.9 x 10
=
11
873K973K
D(m
2
/s)
5.5*10
-14
3.9*10
-13
700
= 138,300 J/mol
Q
d
D
o
= D
1
exp
RT
1
138,300 J/mol
-142
= 5.5 x 10 m/sexp
(8.31 J/mol-K)(873 K)
-52
= 1.05 x 10 m/s
(b) Using these values of D and Q, D at 1123K (850C) is just
od
138,300 J/mol
-52
D = 1.05 x 10 m/sexp
(8.31 J/mol-K)(1123 K)
-122
= 3.8 x 10 m/s
3.室溫下銅的導電係數和電子的遷移率分別為6.0*10
7
(Ω-m)
-1
和0.0030 m
2
/V-S
(a) 計算室溫時銅每立方公尺自由電子的數目
(b) 每個銅原子自由電子的數目?假設密度為8.9g/ cm
3
答: (a)
n=
e
e
=
6.0x10
7
(m)
1
1.602x10
19
C0.0030m
2
/V-s
=1.25 x10
29
m
-3
N
(b)
N
Cu
=
A
A
Cu
6.023x10
23
atoms/mol
8.94g/cm
3
10
6
cm
3
/m
3
=
63.55g/mol
=8.47 x 10
28
m
-3
n1.25x10
29
m
3
==1.48
N
8.47x10
28
m
3
4.下列電的特性已於室溫時,決定於本質和n型外質InP:計算電子和電洞的遷
移率。
本質的
答:
=ne
e
+ pe
h
For the intrinsic material
σ(Ω-m)
-1
2.5*10
-6
n(m
-3
)
3.0*10
13
4.5*10
14
P(m
-3
)
3.0*10
13
2.0*10
12
外質的(n-型) 3.6*10
-5
2.5 x 10 (-m) = 3.0 x 10 m
+ 3 x 10 m
which reduces to
-6-1
13-3-19
1.602 x 10 C
e
13-3-19
1.602 x 10 C
h
0.52 =
e
+
h
Whereas, for the extrinsic InP
3.6 x 10 (-m) = 4.5 x 10 m
+ 2.0 x 10 m
which may be simplified to
-5-1
14-3-19
1.602 x 10 C
e
12-3-19
1.602 x 10 C
h
112.4 = 225
e
+
h
22
= 0.50 m/V-s and = 0.02 m/V-s.
eh
5. 厚度20mm透明材料對於正常入射光的穿透率T為0.85。如果此材料的折射
指數是1.6。計算將獲得穿透率0.75的材料厚度。所有反射損失應被考量。
2
n
1
s
答:
R =
2
n
1
s
=
(1.61)
2
(1.61)
2
-2
= 5.33 x 10
I
T
1
=
ln
2
l
I
o
(1R)
1
T
=ln
2
l
(1R)
1
0.85
-3-1
=
ln
= 2.65 x 10 mm
2
20mm
15.33x10
2
Now, solving for l from Equation (21.19) when T = 0.75
T
1
l=ln
2
(1R)
10.75
= ln
31
2
2.65x10mm
15.33x10
2
= 67.3 mm
2024年3月28日发(作者:黄华奥)
班級: 學號: 姓名:
1. 計算鋁中每立方米原子數目。(鋁原子量:27g/mole;密度:2.71g/ cm
3
)
答:
N =
N
A
Al
A
Al
6.023 x 10
23
atoms/mol
2.71 g/cm
3
N =
26.98 g/mol
223283
= 6.05 x 10 atoms/cm = 6.05 x 10 atoms/m
2.碳在鎳中擴散係數予以之的兩個部同溫度時如下圖所示:
(a)決定D
0
和 Q
d
的值
T(
c
)
(b)在850
c
時,D的大小為何?
600
lnD
1
lnD
2
答:
Q
d
=R
11
T
1
T
2
-14-13
(8.31 J/mol-K)
ln 5.5 x 10 ln 3.9 x 10
=
11
873K973K
D(m
2
/s)
5.5*10
-14
3.9*10
-13
700
= 138,300 J/mol
Q
d
D
o
= D
1
exp
RT
1
138,300 J/mol
-142
= 5.5 x 10 m/sexp
(8.31 J/mol-K)(873 K)
-52
= 1.05 x 10 m/s
(b) Using these values of D and Q, D at 1123K (850C) is just
od
138,300 J/mol
-52
D = 1.05 x 10 m/sexp
(8.31 J/mol-K)(1123 K)
-122
= 3.8 x 10 m/s
3.室溫下銅的導電係數和電子的遷移率分別為6.0*10
7
(Ω-m)
-1
和0.0030 m
2
/V-S
(a) 計算室溫時銅每立方公尺自由電子的數目
(b) 每個銅原子自由電子的數目?假設密度為8.9g/ cm
3
答: (a)
n=
e
e
=
6.0x10
7
(m)
1
1.602x10
19
C0.0030m
2
/V-s
=1.25 x10
29
m
-3
N
(b)
N
Cu
=
A
A
Cu
6.023x10
23
atoms/mol
8.94g/cm
3
10
6
cm
3
/m
3
=
63.55g/mol
=8.47 x 10
28
m
-3
n1.25x10
29
m
3
==1.48
N
8.47x10
28
m
3
4.下列電的特性已於室溫時,決定於本質和n型外質InP:計算電子和電洞的遷
移率。
本質的
答:
=ne
e
+ pe
h
For the intrinsic material
σ(Ω-m)
-1
2.5*10
-6
n(m
-3
)
3.0*10
13
4.5*10
14
P(m
-3
)
3.0*10
13
2.0*10
12
外質的(n-型) 3.6*10
-5
2.5 x 10 (-m) = 3.0 x 10 m
+ 3 x 10 m
which reduces to
-6-1
13-3-19
1.602 x 10 C
e
13-3-19
1.602 x 10 C
h
0.52 =
e
+
h
Whereas, for the extrinsic InP
3.6 x 10 (-m) = 4.5 x 10 m
+ 2.0 x 10 m
which may be simplified to
-5-1
14-3-19
1.602 x 10 C
e
12-3-19
1.602 x 10 C
h
112.4 = 225
e
+
h
22
= 0.50 m/V-s and = 0.02 m/V-s.
eh
5. 厚度20mm透明材料對於正常入射光的穿透率T為0.85。如果此材料的折射
指數是1.6。計算將獲得穿透率0.75的材料厚度。所有反射損失應被考量。
2
n
1
s
答:
R =
2
n
1
s
=
(1.61)
2
(1.61)
2
-2
= 5.33 x 10
I
T
1
=
ln
2
l
I
o
(1R)
1
T
=ln
2
l
(1R)
1
0.85
-3-1
=
ln
= 2.65 x 10 mm
2
20mm
15.33x10
2
Now, solving for l from Equation (21.19) when T = 0.75
T
1
l=ln
2
(1R)
10.75
= ln
31
2
2.65x10mm
15.33x10
2
= 67.3 mm