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Berlin 2001 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 14: Self Assembled Layered Systems

CPP 14.1: Vortrag

Donnerstag, 5. April 2001, 15:45–16:05, 112

The effect of endgroup functionalization on the electronic and structural properties of self-assembled monolayers — •J. Pflaum1, F. Schreiber2,3, G. Scoles1, and A. Kahn11Princeton Materials Institute, Princeton University, Princeton, NJ 08544 — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart — 3MPI für Metallforschung, Heisenbergstr. 1, 70569 Stuttgart

The effect of different terminations (-CH3, -CF3, -OH, -SH) on the electronic and structural properties of thiol-based self-assembled monolayers (SAMs) is investigated using various analytical methods such as grazing-incidence x-ray diffraction (GIXD) and reflectivity, low-energy atom diffraction, scanning tunneling microscopy and spectroscopy (STM / STS). It is shown that the endgroup can influence the structural ordering and shift phase boundaries [1]. These effects are discussed in terms of the sterical constraints and the chemical interactions of the different endgroups. The impact of the endgroup on the charge distribution and the electronic transfer properties is investigated. It is shown that the change of the charge distribution at the endgroup

can cause a gap-like behavior and strong asymmetries in the charge transport characteristics. Finally, the implications for SAM-based heterostructures and adsorption on SAMs are discussed.

[1] F. Schreiber, Prog. Surf. Sci. 65 (2000), 151

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