We have investigated the initial stage of adsorption of a conjugated aromatic compound, 1,4-bis[ß-pyridyl-(2)-vinyl]benzene, on the clean Si(100)-2×1 surface by scanning tunneling microscopy. We observed four different adsorption directions. An individual molecule appears as two or three bright spots, the brightness and distance between bright spots varying for different cases. We conclude that the electronic states of Si dimers modulated by the adsorbed molecules are observed instead of the molecules themselves. Their initial stage of adsorption is explained by considering the molecular size and shape. The preferencial adsorptions to hydrogen-missing dangling bonds on the hydrogen terminated Si(100)-2×1-H surface are also observed.
|Journal||Journal of the Korean Physical Society|
|Issue number||SUPPL. PART 1|
|Publication status||Published - 1997 Dec 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)