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http://dx.doi.org/10.5757/JKVS.2009.18.1.015

Preparation and Stability of Silyl Adlayers on 2×1-Reconstructed and Modified Si(100) Surfaces  

Jo, Sam-K. (Department of Chemistry, Kyungwon University)
Publication Information
Journal of the Korean Vacuum Society / v.18, no.1, 2009 , pp. 15-23 More about this Journal
Abstract
Saturation-coverage silyl, $-SiH_3(a)$, overlayers were prepared from $Si_2H_6$ adsorption on three comparative surfaces: clean unmodified; D-precovered; and atomically roughened Si(100). Together with its precursor-mediated adsorption behavior, the surface reactivity of $Si_2H_6$ was found to be the highest on the unmodified Si(100)-$2{\times}1$ surface. This was correlated with its dissociative adsorption mechanism, in which both the $H_3Si-SiH_3$ bond scission and the dual surface $Si-SiH_3(a)$ bond formation require a surface dangling bond 'pair'. The unusually high thermal stability of $-SiH_3(a)$ on the unmodified surface was ascribed to a nearly close-packed $-SiH_3(a)$ coverage of ${\sim}0.9$ monolayer and the consequent lack of dangling bonds on the silyl-packed surface.
Keywords
Si(100); Disilane($Si_2H_6$); Silyl($SiH_3$); Adsorption;
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