Question

Relation between conductivity and temperature in semiconductor

Answer 1

Metal conductivity generally goes down or resistivity goes up with temperature goes up.

It is more complicated for semiconductor. There are basically 3 different regions of interest; undoped or intrinsic semiconductor, lightly doped and heavily doped:

1) Undoped or intrinsic semiconductor; conductivity goes up or resistivity goes down with temperature goes up.

2) lightly doped, up to about 10E20, conductivity goes down or resistivity goes up with temperature goes up.

3) Heavily doped >>10E20, conductivity turns up again or resistivity goes down with temperature goes up.

Answer 2

$<b>$The electrical conductivity of asemiconductor increases withincrease in temperature because withincrease in temperature the electrons overcome the energy barrier betweenthe valence band and the conductionband easily.