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DS: Fachverband Dünne Schichten
DS 4: Organic Thin Films I
DS 4.6: Talk
Monday, March 7, 2016, 11:00–11:15, H11
Monolayer phases of a dipolar perylene derivative on Au(111) and surface potential built-up in multilayers — •Jens Niederhausen1,2, Heath R. Kersell3, Christos Christodoulo1,2, Georg Heimel1, Henrike Wonneberger4, Klaus Müllen5, Jürgen P. Rabe1, Saw-Wai Hla3, and Norbert Koch1,2 — 1Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 2Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof, Berlin, Germany — 3Ohio University, Physics & Astronomy Department, Ohio, USA — 4BASF SE, Ludwigshafen, Germany — 5Max Planck Institut für Polymerforschung, Mainz, Germany
The molecular self-assembly and the electronic structure of a strongly polar perylene derivative on Au(111) was elucidated with room temperature scanning tunneling microscopy and spectroscopy in combination with ultraviolet and X-ray photoelectron spectroscopies. The molecular arrangements and the increase of the average number of molecules per unit cell via ripening indicate a significant influence of the dipole moment on the molecular assembly. Applying an electric field with the STM tip is found to induce a phase change that can alter the anisotropy of the molecular film. Multilayer molecules arrange with a slightly preferred out-of-plane orientation, inducing a surface potential of up to 1.2 eV. This resembles the giant surface potential effect that was reported before for other polar molecules and deemed applicable for data storage. Notably, the surface potential in the present case can in part be reversibly removed by visible light irradiation.