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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
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Introduction to semiconductor
Introduction to semiconductor
12 Mins
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Intrinsic Semiconductor
8 mins
Effect of Temperature on Pure Semiconductor
7 mins
Intrinsic Semiconductor
8 mins
Extrinsic Semiconductor
6 mins
p-type and n-type semiconductor
17 mins
REVISE WITH CONCEPTS
Metals, Conductors and semiconductors
Example
Definitions
Formulaes
Advanced Knowledge of Conductors, Insulators and Semiconductors
Example
Definitions
Formulaes
Band Theory of Solids
Example
Definitions
Formulaes
QUICK SUMMARY WITH STORIES
Introduction to Semiconductor
2 mins read
Metals, Conductors and semiconductors
3 mins read
Energy Band in Semiconductor
3 mins read
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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>
Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.
Easy
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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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>
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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>
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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>
Show on a graph, the variation of resistivity with temperature for a typical semiconductor.
Medium
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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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>
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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>