Physics for Information Science: Unit II: Semiconductor Physics
Effect of Temperature on Carrier Transport
Semiconductor
In conductors, when temperature is increased, the lattice vibration increases, which causes increased scattering and hence the mobility and conductivity decreases.
EFFECT OF TEMPERATURE ON CARRIER TRANSPORT
Conductors
In conductors, when temperature is increased, the lattice vibration increases, which causes increased scattering and hence the mobility and conductivity decreases [σ ∞ 1/T].
So,
conductors have positive temperature coefficient of resistance i.e., [ρ ∞ T].
Intrinsic semiconductors
In
intrinsic semiconductors, when temperature is increased, more numbers of charge
carriers both electrons and holes contributes for current. Therefore the
conductivity increases with the increase in temperature. [i.e., σ ∞ T].
So,
we can say that intrinsic semiconductors is said to have negative temperature
coefficient of resistance [ρ ∞ 1/T].
Extrinsic semiconductors
At
normal temperature an extrinsic semiconductor will behave as a conductor. When
the temperature is increased, since most of the dopant atoms are already
ionised, the scattering increases and causes the conductivity to decrease.
However,
at transition temperature, the generation of electron-hole pair increases the
conductivity.
Thus
an extrinsic semiconductor will have positive temperature coefficient at normal
temperature and changes to negative temperature coefficient at transition
temperature.
Physics for Information Science: Unit II: Semiconductor Physics : Tag: : Semiconductor - Effect of Temperature on Carrier Transport
Physics for Information Science: Unit II: Semiconductor Physics
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