energysurface

Separation

Posted on: November 17, 2010

•The band gap enables electrons to stay in the conduction band for long enough to be exploited.
•In a metal the continuum of available energy levels means that the electron would return to the ground state quickly.
•When an electron is promoted across a band gap it quickly decays to the lowest state in the conduction band but decay across the band gap is much slower.
–Thermalisation, Energy lost as heat.
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