EE3114
Hwk #1 Semiconductor Physics and pn Junctions
PROBLEMS
Due 1 week
Read textbook chapter sections 1.1, 1.2, 1.3
1)
Intrinsic Semiconductors:
Plot the intrinsic carrier concentration,
η
i
, over a
temperature range of 40
o
C to +60
o
C. Use a software tool, such as Excel, Matlab or
other, to plot the temperature on the xaxis and
η
i
on the yaxis.
Use a LOG scale for
the yaxis. Perform this calculation for the following two semiconductor materials and
plot both curves on the same graph. Submit the plot(s).
a. silicon (Si)
b. gallium arsenide (GaAs)
2)
Intrinsic Semiconductors:
Find the concentration of electrons and holes in a silicon
semiconductor that has 10
15
cm
3
donor atoms.
The temperature is 300
o
K.
Is this an “n
type” or “ptype” semiconductor?
3)
pn
Junctions:
Determine the builtin potential,
V
bi
, for a silicon
pn
junction for the
following three cases.
Use T=300
o
K.
a.
N
a
=
N
d
= 5 x 10
15
cm
3
b.
N
a
= 10
15
cm
3
and
N
d
= 5 x 10
17
cm
3
c.
N
a
=
N
d
= 10
18
cm
3
4)
pn
Junctions:
Determine the junction capacitance for the following three cases. For the
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 Fall '10
 moon
 PN Junctions, PN Junction Diode, Junction Diode Characteristics

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