Question

Predict the effect (if any) of an increase in temperature on the electrical conductivity of (b) a semiconductor;

Answer 1

If we increase the temperature then the more no of electrons get the energy to jump from conduction band to valence band , thereby increase the conduction of the semiconductor .

Semiconductors :

In the semiconductor the energy gap between the valence band and the conduction band is small . this small energy gap allows some electrons to move from the valence band to the conduction band . thus the semiconductor conduct electricity and conductivity increases with increase in temperature .

There are two type of semiconductor : intrinsic semiconductor and extrinsic semiconductor .

Pure semiconducting substances are called intrinsic semiconductor .

The semiconductor obtained by doping are called extrinsic semiconductors.

Extrinsic semiconductor are of two types : n-type semiconductor and     p-type semiconductor .

n-type semiconductor is due to metal excess defect and p-type semiconductor is due to metal deficiency defect .

Semiconductors are used in transistors , photo-electric devices and rectifiers .

Learn more about semiconductors here :

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