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Applications of the CPA to elemental tetrahedrally bonded amorphous semiconductors
Authors:CT White  WE Carlos
Institution:Naval Research Laboratory, Washington, DC 20375, U.S.A.
Abstract:It is pointed out that the CPA can easily be coupled with multiband, nearest-neighbor tight-binding Bethe-lattice Hamiltonians to fruitfully study the electronic structure of tetrahedrally bonded elemental amorphous semiconductors. Results are presented which illustrate the effects on the model semiconducting gap of (i) a rectangular distribution of site diagonal terms in the Hamiltonian, and (ii) vacancies distributed randomly over the lattice. The relationship of these results to experiment is briefly explored.
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