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Class 12
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Physics
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Semiconductor Electronics: Materials, Devices and Simple Circuits
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Energy Bands
Energy Bands
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Metals, Conductors and semiconductors
Example
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Electron Energies in Solids
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Important Questions
A p-n photodiode is fabricated from a semiconductor with band gap of
2
.
8
e
V
. Can it detect a wavelength of
6
0
0
0
n
m
?
Medium
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>
Draw separate energy band diagrams for conductors, semi-conductors and insulators and label each of them.
Medium
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>
Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.
Easy
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>
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than
2
4
8
0
n
m
is incident on it. The band gap (in
e
V
) for the semiconductor is
Medium
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>
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to
(
E
g
)
C
,
(
E
g
)
S
i
and
(
E
g
)
G
e
.Which of the following statements is true?
Medium
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>
Show on a graph, the variation of resistivity with temperature for a typical semiconductor.
Medium
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>
Explain the formation of energy bands in solids. On the basis of energy bands distinguish between a metal, a semiconductor and an insulator.
Medium
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>
Fermi energy level for intrinsic semiconductors lies
Easy
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>
A pn photo diode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength :
Medium
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>
In an insulator, the forbidden energy gap between the
valence band and conduction band is of the order of
Easy
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>