Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 56: Metal substrates: Adsorption of organic / bio molecules III

O 56.2: Talk

Wednesday, March 28, 2012, 17:00–17:15, A 053

Organometallic opto-electronically active magnetic molecules on metallic surfaces — •Cormac Toher, Jörg Meyer, Anja Nickel, Robin Ohmann, Francesca Moresco, and Gianaurelio Cuniberti — Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany.

Opto-electronically active organic molecules offer several advantages over traditional solid-state semiconductor materials in the fabrication of solar cells, including their low-cost, low weight, and flexibility. Here, we present the results of combined STM and DFT investigations of organometallic optoelectronically active magnetic molecules which are based on aza-BODIPY derivatives. Aza-BODIPY molecules have a tunable infra-red absorption and function as electron donors in organic solar cells [1, 2]. By switching between different central metal atoms such as Co or Zn, both magnetic and non-magnetic examples of this molecule can be synthesized. STS conductance measurements on the magnetic molecules suggest evidence of changes in their spin configuration when an electric field is applied. DFT calculations indicate that this may be due to the electrostatic spin-crossover effect [3].

[1]J. Meyer et. al, Phys. Chem. Chem. Phys. 13, 14421 (2011).

[2]R.Gresser et. al., Chem.-Eur. J. 17, 2939 (2011).

[3]N. Baadji et. al., Nature Materials 8, 813 (2009).