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a semiconductor has an electron concentration of 6*10^22 per m^3 and hole concentration of 8.5 * 10^9 per m^3. then it is
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12th
Physics
Semiconductor Electronics: Materials, Devices and Simple Circuits
Intrinsic and Extrinsic Semiconductors
A semiconductor has an elec...
PHYSICS
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Asked on October 15, 2019 by
Moin Pokuri
A semiconductor has an electron concentration of 8×10
13
per cm
3
and a hole concentration of 5×10
12
per cm
3
. The electron mobility is 25000cm
2
V
−1
s
−1
and the hole mobility is 100cm
2
V
−1
s
−1
. Then,
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ANSWER
n
e
=8×10
13
/cm
3
n
h
=5×10
12
/cm
3
μ
e
=25000cm
2
/(Vs)
μ
h
=100cm
2
/(Vs)
Since n
e
>n
h
, the semiconductor is n-type.
The conductivity of the semi conductor is e(n
e
μ
e
+n
h
μ
h
)
=1.6×10
19
((8×10
13
)(25000)+(5×10
12
)(100))mho/cm
=0.32 mho cm
−1
=320 m mho cm
−1