Formation of covalent Si-N linkages on pyrrole functionalized Si(100)-(2 x1)

The covalent attachment of a pyrrolyl monolayer has been efficiently achiev ed by directly exposing pyrrole molecules to the clean Si(100)-(2 x 1) surf ace. The high-resolution electron energy loss spectroscopy (HREELS), and X- ray photoelectron spectroscopy (XPS) studies show that the robust pyrrolyl monolayer is directly bonded to the Si(100) surface via the Si-N linkage wi th the preservation of the pyrrolyl ring structure. The as-prepared pyrrole -modified silicon surfaces can serve as templates for further electrochemic al polymerization of polypyrrole thin films onto silicon substrates, provid ing new opportunity for fabrication of new polypyrrole/silicon heterojuncti ons with improved performance. (C) 2000 Elsevier Science B.V. All rights re served.