Abstract
ABSTRACTThe adsorption and decomposition of several Ge-containing compounds on Si(100) have been investigated with the intent of elucidating the surface processes leading to the deposition of epitaxial Ge films from these gaseous sources. Exposure of digermane, Ge2H6/ to Si(100) at 110 K results in molecular adsorption and ab initio calculations are used to help interpret the low temperature ultraviolet photoelectron spectrum. Diethylgermane, GeH2Et2, chemisorbs dissociatively on Si(100) at 110 K. The adsorption products are GeH2 and adsorbed ethyl groups. Large exposures of GeH2Et2 result in the formation of a physisorbed layer of molecular GeH2Et2 on top of the dissociated layer. The surface ethyl groups thermally decompose near 670 K via a β-hydride elimination reaction evolving C2H4 into the gas phase. The interactions of Ge2H6 and GeH2Et2 with Si(100) are discussed and compared to similar experiments with GeH4 as the Ge-containing gas source.
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