Abstract
Abstract The electron density near clean and alkali-covered semiconductor surfaces is calculated using the exact relationship between the electrostatic potential of an adsystem and the exchange-correlation energy of the semiconductor substrate. The change in the work-function of a semiconductor surface as a function of the alkali adatom concentration is predicted on the basis of the calculated electron density. The inclusion of Coulomb correlation in this system makes it possible to obtain a more realistic description of the variation of the semiconductor surface properties with alkali adsorption.
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