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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2010.12.06-10

STM-experiments on aza-BODIPY

J. Meyer, A. Wadewitz, C. Toher, L. Mani, F. Moresco, G. Cuniberti


2010.12.06-10; Maison MINATEC, Grenoble, France

Scanning Tunnelling Microscopy (STM) is a powerful experimental techniques in surface science. It combines atomic resolution imaging with the opportunity of nanoscale manipulations. Additionally, STM enable a mapping of the density of states. We report first experiments on Aza-Bodipy adsorbed on metals surfaces with a newly commissioned low-temperature STM/AFM-System. Aza-Bodipy (e.g. 1,3,5,7-tetraphenyl-8-azadipyromethene (Fig.1)) are a class of organic fluorescent dyes characterised by the same molecular core region indicated in black in Figure 1. These molecules exhibit strong chemical stability and highly tuneable, sharp absorption wavelength. Aza-Bodipy have already been used for immunostaining and photodynamic therapy during the last few years. Recently organic photovoltaics (OPVs) electron donor materials emerged as another field of application, because of Aza-Bodipys strong infrared absorption. In this work single Aza-Bodipy molecules adsorbed on Ag(110) and Au(111) were investigated by STM at 77 K and 5 K. The adsorption configuration and geometry were determined and found to be in qualitative agreement with theoretical simulations.

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