The conductivity of a substance increases with increase in temperature. It may be identified as

 

Conductivity of semiconductor increases with increase in temperature.

Semiconductors are materials whose conductivity is in the middle between that of nonconductors or insulators and that of conductors (typically metals) (such as most ceramics). Semiconductors can be created from pure elements like silicon or germanium or from compounds like gallium arsenide or cadmium selenide.