Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Organic Electronics and Photovoltaics (jointly with CPP, DS, HL)

O 54.8: Talk

Wednesday, March 13, 2013, 17:45–18:00, H33

Charge transfer at the interface between substituted pentacene nanorods and gold single crystals — •Sabine-Antonia Savu, Maria Benedetta Casu, and Thomas Chassé — Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany

Pentacene is one of the most investigated organic molecules due to its successful application in organic electronics. Substitution in pentacene gives the opportunity to tailor the properties which are needed for applications; therefore it is necessary to investigate its influence on molecular aggregation and thin film formation. In particular, here we report our investigations on nanorods of three newly synthesized substituted pentacenes with different degrees of fluorination. We performed X-ray photoemission spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and atomic force microscopy (AFM) on nanorods deposited on Au(111) and Au(110) single crystals. XPS thickness dependent spectra in combination with NEXAFS investigations show that the screening of the core hole occurs via charge transfer from the metal to the molecule. In addition, the morphology of the nanorods has been investigated by using AFM, evaluating the nanorod characteristics also from a statistical point of view and taking the different degree of fluorination into account.