Adsorption of cyclopentene on the Si(001) surface: A first-principles study

Abstract
We study the adsorption of cyclopentene on the Si(001) surface by first-principles density-functional calculations within the generalized-gradient approximation. At low coverages cyclopentene molecules favor adsorption on alternate Si dimers rather than on neighboring dimers along a dimer row, because of the repulsive hydrogen-hydrogen interaction between adsorbed molecules. Once such adsorption completely fills the surface, further adsorption occurs via a “three-atom” intermediate state with some energy barriers. Based on the energetics of various adsorption configurations we present a simple picture for the adsorption of cyclopentene on Si(001).