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- W2025069178 abstract "Abstract First principles all-electron Hartree-Fock and density functional theory cluster calculations have been performed to investigate the chemisorption of atomic hydrogen on the Si(111)√3 × √3R30°-B surface. Both the equilibrium geometries corresponding to n hydrogen atoms (1 ≤ n ≤ 5) chemisorbing on the B-S5 and B-T4 reconstructed structures, and the desorption energies for a silicon or boron adatom bonded to x hydrogen atoms (0 ≤ x ≤ 3), have been obtained. As successively more hydrogen is chemisorbed, a silicon or boron adatom is found to move from its original threefold site to an adjacent bridge site, and then to a neighbouring on-top site. It is also found that boron will most likely occupy a subsurface substitutional S5 site at low hydrogen coverages (≤ 0.67ML), but appear as an adatom at an on-top site directly above one of the first-layer silicon atoms for hydrogen exposures higher than 0.67 ML. This boron segregation at high hydrogen exposures prevents the formation of SiH2 and SiH3 complexes and leads to the prediction that only SiH and BH2 will be observed on an Si(111):B hydrogenated surface. It also provides an explanation for the lack of Si surface etching at high hydrogen exposure. All of these results are in good agreement with the available experimental data on hydrogenated B/Si(111) surfaces." @default.
- W2025069178 created "2016-06-24" @default.
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- W2025069178 date "1997-12-01" @default.
- W2025069178 modified "2023-09-27" @default.
- W2025069178 title "Ab initio cluster calculations of the chemisorption of hydrogen on the Si(111)√3 × √3R30°-B surface" @default.
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- W2025069178 doi "https://doi.org/10.1016/s0039-6028(97)00596-7" @default.
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