Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 18: Organic Thin Films I
DS 18.6: Talk
Wednesday, April 2, 2014, 10:45–11:00, CHE 91
Electronic and structural properties at the interface between a perylene di-imide-based molecule and gold — •Francesca Ciccullo1, Sabine Antonia Savu2, Antonio Cassinese1, Thomas Chassé2, and Maria Benedetta Casu2 — 1CNR-SPIN and Department of Physics Science, University of Naples, Piazzale Tecchio 80, Naples, Italy — 2Institute of Physical and Theoretical Chemistry, Tübingen, Germany
Nowadays perylene di-imide derivatives are considered to be among the most promising n-type organic materials for high performance organic thin film transistors (OTFTs). However, the device behavior is strongly affected by interactions at the organic/substrate interface. A full understanding of these interactions is crucial to make these materials technologically appealing. In this work, we study N,N'-bis(n- ctyl)-x:y,dicyanoperylene-3,4:9,10-bis(dicarboximide) (PDI-8CN2) thin films deposited on Au(111) single crystals by using X-ray photoemission spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and atomic force microscopy (AFM). We focus on the investigation of morphology, molecular orientation, and electronic structure at the organic/metal interface. Our analysis reveals that the molecular bindings are perturbed when molecules come in direct contact with the gold surface, suggesting that PDI-8CN2 strongly interacts with gold atoms. At the state of the art, there is not any detailed comprehension of the PDI-8CN2/gold interface. We believe that our results are a relevant step forward to the full application of these materials in organic electronic devices.