Abstract
In these lectures, we shall be discussing the nature of electronic states in crystalline and amorphous semiconductors. The Bloch states of the perfect infinite crystals are well known; we shall be more concerned with what happens when periodicity breaks down, as it does in amorphous semiconductors, and as it does at the surface of a crystal. Finally, we shall outline some of the consequencies of this electronic structure. It is intended to stress the physical principles involved, rather than details of the mathematical formalism. Indeed, for some of the problems we shall consider there is, as yet, no very adequate formalism available.
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