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EEE 166 Physical Electronics Spring 2007
03/22/2007 Midterm Exam
Note: 1. This is an closed book/notes test.
2. Show all work for full credit. Underline your answer.
3. Complete all problems. Point credit is shown for each problem.
4. Use the tables below to answer the problems where necessary.
Table 1. Semiconductor Properties at T = 300 K
Property Si GaAs Ge
Bandgap Energy (eV) 1.12 1.42 0.66
Nc cm
-3
2.8 x 10
19
4.7 x 10
17
1.04 x 10
19
Nv cm
-3
1.04 x 10
19
7.0 x 10
18
6.0 x 10
18
n
i
cm
-3
1.5 x 10
10
1.8 x 10
6
2.4 x 10
13
Effective Mass electron
?
?
?
?
?
?
?
?
0
*
m
m
n
1.08 0.067 0.55
Effective Mass hole
?
?
?
?
?
?
?
?
0
*
m
m
p
0.56 0.48 0.37
Table 2. Physical Constants
Boltzmann constant k
B
1.3807 x 10
-23
J/K
Boltzmann constant (eV) k
B
8.62 x 10
-5
eV/K
Charge of electron e 1.60218 x 10
-19
C
Permittivity of Free Space
?
0
8.85 x 10
-14
F/cm
Planck's constant h ...

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