AVS 52nd International Symposium
    Surface Science Thursday Sessions
       Session SS2-ThM

Paper SS2-ThM9
Surface Functionalization of Si(100)2x1 by Halogenated Ethylenes: Formation of C2-dimer, Vinylene, Vinylidene, and their Halogenated Derivatives

Thursday, November 3, 2005, 11:00 am, Room 202

Session: Functionalization of Semiconductor Surfaces
Presenter: X.J. Zhou, University of Waterloo, Canada
Authors: K.T. Leung, University of Waterloo, Canada
X.J. Zhou, University of Waterloo, Canada
Correspondent: Click to Email
Our recent studies on halogenated ethylenes on Si(111)7x7 and Si(100)2x1 have demonstrated the importance of a competing insertion mechanism to the commonly observed cycloaddition mechanism for Si surface functionalization. The combination of the C=C bond with Cl atoms provides interesting molecular platforms for investigating various novel effects involving different molecular symmetries and structures, Cl content and structural chemistries. The adsorption of these chlorinated ethylenes and their subsequent thermal chemistries on Si single-crystal surfaces can be used to generate ordered arrays of novel adspecies, including tetra-@sigma@ bonded C2 dimer (>C=C<), di-@sigma@ bonded vinylene (-HC=CH-) and vinylidene (>C=CH@sub 2@), and mono-@sigma@ bonded vinyl (-HC=CH@sub 2@) adspecies as well as their chlorinated homologs. We also show that purification of one of these C=C containing arrays could be achieved by simple manipulation of the annealing temperature or by post-exposure of H atoms. @FootnoteText@ * Work supported by the Natural Sciences and Engineering Research Council of Canada.