Influence of molecular conformation on organic/metal interface energetics

Norbert Koch*, Georg Heimel, Jishan Wu, Egbert Zojer, Robert L. Johnson, Jean-Luc Bredas, Klaus Müllen, Jürgen P. Rabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Using ultraviolet photoemission spectroscopy (UPS), we show that the conformation of a conjugated organic molecule can be changed significantly upon adsorption on a metal surface, even in the case of weak interactions with the metal. This is accomplished by comparing the thickness-dependent spectral evolution for a non-rigid non-planar molecule (p-sexiphenyl) deposited onto Ag(1 1 1), with those of a coplanar molecule (α-sexithienyl) and a rigid non-planar one (1,3,4,6,7,9,10,12,13,15,16,18-dodecamethyl-hexa-peri- hexabenzocoronene). Molecular conformation changes can influence hole injection barriers by at least 0.1 eV. These results have a direct impact on the detailed understanding of organic/metal interfaces.

Original languageEnglish (US)
Pages (from-to)390-395
Number of pages6
JournalChemical Physics Letters
Volume413
Issue number4-6
DOIs
StatePublished - Sep 26 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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