Berlin 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.41: Poster

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

Growth and vibrational properties of ultra-thin TiOPc films on Ag(111) — Laura Fernández, Sebastian Thussing, Sebastian Flade, and •Peter Jakob — Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany

The coverage dependent growth of titanyl-phthalocyanine (TiOPc) ultra-thin films on a Ag(111) surface has been studied using IR Spectroscopy, SPA-LEED, and TDS. In the monolayer regime three different phases were found: a 2D-gas phase in the low coverage regime (θ< 0.7ML), a commensurate (4√3×7)rect phase for 0.8-0.9 ML, and finally, a point-on-line phase when the coverage approaches saturation. While the IR spectra of the monolayer phases vary only slightly, the vibrational modes corresponding to the mono- and bilayers of TiOPc/Ag(111) are distinctly different, so that the transition from the ML to the BL regime is clearly defined. Thermal desorption spectroscopy measurements reveal a high thermal stability of the TiOPc bilayer, which requires temperatures above 500K to desorb from the Ag(111) surface. Similarly, the stacked (TiOPc bilayer on PTCDA)/Ag(111) structure displays exceptional stability of the organic heterolayer interface. Only for temperatures above 470K indications of intermixing or degradation of the underlying PTCDA/Ag(111) layer are observed.