Is it difficult to make an intrinsic semiconductor?
Name two factors on which the electrical conductivity of intrinsic semiconductor at a given temperature depends.
How does the conductivity of a semiconductor change with the rise in its temperature?

Explanation

An instrinsic semiconductor is one which is extremely pure with a purity level of 99.9999%. It is very difficult to achieve this much purity in a semiconductor.
Electrical conductivity of an intrinsic semiconductor at a given temperature depends on (i) the number densities of intrinsic charge carriers present in it and (ii) the width of the forbidden energy gap between conduction band and valence band.
The conductivity of a semiconductor increases exponentially with temperature.