Abstract
Li-adsorption on the Si(111)7×7 surface at room temperature has been studied for different metal coverages with core-level spectroscopy. Four Li-induced components are observed in the Si 2p level at high Li-coverages indicating the formation of four thermodynamically stable phases. It is shown that the reaction between the Li atoms and the Si(111)7×7 surface takes place in two steps. In the first the surface reconstructs towards a “7×1” reconstruction and in the second Li react with the Si-substrate, forming Li silicides, with the Si atom coordinating up to four Li neighbors.
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