Module 6 : PHYSICS OF SEMICONDUCTOR DEVICES
Lecture 30 : Energy Band Diagram
  An corresponding formula for resistivity of semiconductors (or of insulators) is
$\displaystyle \rho(T) = \rho_0\exp[(\frac{1}{T}-\frac{1}{T_0})\frac{\Delta E}{2k}]$
  where $ \rho_0$ is the resistivity at 0 $ ^\circ$C (i.e. at 273 K) and $ T$ is the absolute temperature at which the resistivity is measured. Here $ k= $ is Boltzmann constant and $ \Delta E$ is the bandgap energy, which, for semiconductors is of the order of 1 eV and much larger for insulators.
 
\includegraphics[width=\textwidth]{resistivity1.eps}
 
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