Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.6: Talk

Monday, March 20, 2017, 11:45–12:00, WIL A317

Excited states dynamics in TIPS-Pentacene on Au(111) — •Arnulf Stein and Petra Tegeder — PCI Universität Heidelberg, Heidelberg, Deutschland

Singlet fission is a promising approach to overcome the theoretical Shockley Queisser - Limit in organic semiconductor solar cells and is so far only obtained in a limited number of molecules [1]. One representative compound is the triisopropylsilylethynyl-pentacene (TIPS-Pn) which stands out because it combines solubility, self-assembly into π-stacked arrays to enhance intermolecular orbital overlap [2] and vacuum processability [3]. We studied TIPS-Pn adsorbed on Au(111) using two-photon-photoemission spectroscopy (2PPE). We determined the electronic structure and the dynamics of optically excited states at interfaces and within thin films.

[1] M.B. Smith and J. Michl, Chem. Rev. 110, 6891 (2010)

[2] J.E. Anthony et al., JACS, 123, 9482 (2001).

[3] A. Gnoli et al. J. Phys. Chem. C, 118, 22522 (2014).