Adsorption kinetics of dimethylsilane (DMS) at Si(0 0 1) surface has been investigated by using temperature-programmed desorption (TPD). The saturated hydrogen coverage of two monolayer was identical with that from monomethylsilane (MMS)-saturated surface. By being combined with the C/H ratios within a molecule (1/6 for MMS and 1/4 for DMS), this fact suggests enhanced C incorporation by DMS as compared with MMS by a factor of 1.5. The TPD spectra are deconvoluted into β 1 (∼510°C), β′ 1 (∼550°C), γ (∼615°C) and δ (∼910°C) peaks. The appearance of the bulk C-related γ peak from the very initial adsorption, in contrast to MMS, is consistent with the enhanced C incorporation. Although the hydrogen uptake (H-uptake) curve is quantitatively fitted with the four-site adsorption model, discussions on the sub-peak assignments suggest presence of further decompositions of ad-species at initial adsorptions.
|ジャーナル||Applied Surface Science|
|出版ステータス||Published - 2004 3月 15|
ASJC Scopus subject areas
- 化学 (全般)