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Byju's Answer
Standard XII
Physics
Mechanism of Carrier Conduction
what is the d...
Question
what is the donor concentration in n-type germanium of 1ohm-cm resistivity at 300K given electron mobility is equals to 3900cm^{}/V.s
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Q.
The electron mobility in N-type germanium is
3900
cm
2
/
V.s
and its conductivity is
6.24
mho/cm
, then impurity concentration is
(Assume that the effect of cotters is negligible)
Q.
What is the number density of donor atoms which must be added to a pure germanium semiconductor to produce an N-type semiconductor of conductivity
6.4
X
10
2
o
h
m
−
1
m
−
1
? The mobility of electrons in N-type germanium is
4
X
10
−
1
m
2
V
−
1
s
−
1
. Neglect contribution of holes to conductivity.
Q.
The mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is
10
19
m
−
3
and their mobility is
1.6
m
2
/
(
V
.
s
)
then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to:
Q.
What is the number density of donor atoms which must be added to a pure germanium semiconductor to produce an N-type semiconductor of conductivity
6.4
×
10
2
ohm
–
1
m
–
1
? The mobility of electrons in N-type germanium is
4
×
10
–
1
m
2
V
–
1
s
–
1
. Neglect contribution of holes to conductivity.
Q.
The electron mobility in N-type germanium is
3900
cm
2
/
v
−
s
and its conductivity is
6.24
mho
/
cm
; If the effect of cotters is negligible, then the impurity concentration will be
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