Calculate the temperature at which there is a .02 probability that
a state 1.2 eV above the valence band will not contain any positive
charge carriers. Assume that the Fermi level energy of a particular
material is 5 eV from valence band and the electron in this material
follow the Fermi-Dirac distribution. The band gap energy is 8 eV.
Draw the energy level diagram mentioning different energy level.
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