Question
The resistivities of semiconductors and insulators decrease with increase of temperature. Why?
Solution
The resistivity of a metallic body is given by,
ρt = ρ0 (1 + αr t)
where,
is the resistivity at temperature T ,
is the resistivity at a reference temperature and,
is the temperature coefficient of resistivity.
For semiconductors and insulators, is negative.
Thus, resistivity of semiconductors and insulators decreases with increasing temperature.
ρt = ρ0 (1 + αr t)
where,
is the resistivity at temperature T ,
is the resistivity at a reference temperature and,
is the temperature coefficient of resistivity.
For semiconductors and insulators, is negative.
Thus, resistivity of semiconductors and insulators decreases with increasing temperature.
