Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.16: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

The adsorption geometry and electronic structure of TCNQ and TCNQ + Mn on Ag(001) and Cu(001) surfaces — •Martin Graus¹, Vitaliy Feyer², Pascal Nigge¹, Giovanni Zamborlini², Robert G. Acres³, Achim Schöll¹, Friedrich Reinert¹, and Claus M. Schneider^2,4 — ¹Universität Würzburg, Experimentelle Physik VII — ²Research Center Jülich, 52425 Jülich, Germany — ³Sincrotrone Trieste, 34012 Basovizza, Trieste, Italy — ⁴Universität Duisburg-Essen, 47048 Duisburg, Germany

Molecular beam deposited epitaxial monolayers of TCNQ on Cu(001) and Ag(001) were examined by LEED and photoelectron momentum mapping with respect to adsorption geometry and electronic structure. For Ag(001), two commensurate superstructures depending on the organic coverage were found, whereas the superstructure formed on Cu(001) is incommensurate. Subsequent deposition of Mn on top of TCNQ/Ag(001) creates a commensurate metal-organic array with long-range order. Comparing angle resolved photoemission data of the TCNQ LUMO with DFT calculations allows identifying the azimuthal orientation of the TCNQ molecules in the particular unit cells. We furthermore observe a charge transfer from the substrate resulting in filling of the TCNQ LUMO for all investigated interfaces. In case of Mn coadsorption the TCNQ HOMO and LUMO shift by 230 meV towards higher binding energy compared with TCNQ/Ag(001). A detailed analysis of the angle-resolved photoemission data showed no significant lateral band dispersion.