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Physics
Although carbon, silicon and germanium have same lattice structure and four valence electrons each, their band structure leads to the energy gaps as
Q. Although carbon, silicon and germanium have same lattice structure and four valence electrons each, their band structure leads to the energy gaps as
2313
238
Delhi UMET/DPMT
Delhi UMET/DPMT 2010
Report Error
A
E
g
(
S
i
)
<
E
g
(
G
e
)
<
E
g
(
C
)
B
E
g
(
S
i
)
>
E
g
(
G
e
)
<
E
g
(
C
)
C
E
g
(
S
i
)
<
E
g
(
G
e
)
>
E
g
(
C
)
D
E
g
(
S
i
)
>
E
g
(
G
e
)
>
E
g
(
C
)
Solution:
Band gap of silicon is
1.11
e
V
, of germanium is
0.67
e
V
and so the correct order of band gap is
E
g
(
S
i
)
>
E
g
(
G
e
)
<
E
g
(
C
)
.