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Adsorption of benzene on Si(100) from first principles

Pier Luigi Silvestrelli·Francesco Ancilotto·Flavio Toigo
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Abstract

Adsorption of benzene on the Si(100) surface is studied from first principles. We find that the most stable configuration is a tetra-$σ$-bonded structure characterized by one C-C double bond and four C-Si bonds. A similar structure, obtained by rotating the benzene molecule by 90 degrees, lies slightly higher in energy. However, rather narrow wells on the potential energy surface characterize these adsorption configurations. A benzene molecule impinging on the Si surface is most likely to be adsorbed in one of three different di-$σ$-bonded, metastable structures, characterized by two C-Si bonds, and eventually converts into the lowest-energy configurations. These results are consistent with recent experiments.

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Pier Luigi Silvestrelli, Francesco Ancilotto, Flavio Toigo. 2000-02-01. Adsorption of benzene on Si(100) from first principles. https://doi.org/10.1103/physrevb.62.1596

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