Physics for Information Science: Unit II: Semiconductor Physics
Properties of Semiconductor
The resistivity of semiconductors lies between conducting and insulating materials.At 0 K they behave as insulators.
PROPERTIES
OF SEMICONDUCTOR
1.
The resistivity of semiconductors lies between conducting and insulating
materials. (i.e.,) 10-4 to 0.5 ohm - metre..
2.
At 0 K they behave as insulators.
3.
When the temperature is raised or when impurities are added, their conductivity
increases. i.e., ρ ∞ 1/T
(This
is converse compared to usual conductors for which ρ∞ T.)
4.
They have negative temperature co-efficient of resistance.
Explanation
The
reason for the above property is, when the temperature is increased, large
number of charge carriers are produced due to breaking of covalent bonds and
hence these electrons move freely and gives rise to conductivity.
5.
In conductors the electrons are charge
carriers and will take part in conduction but in semiconductor both electrons
and holes are charge carriers and will take part in conduction. (Hole is
produced by the vacancy of electrons at bond sites).
Total
conductivity, σ = σe + σ h
Where,
σe - conductivity due to electrons.
σ
h - conductivity due to holes.
Physics for Information Science: Unit II: Semiconductor Physics : Tag: : - Properties of Semiconductor
Physics for Information Science: Unit II: Semiconductor Physics
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Physics for Information Science
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