Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Organic Electronics and Photovoltaics I

CPP 38.5: Talk

Tuesday, March 17, 2020, 10:30–10:45, ZEU 255

Excitation lifetime reduction in ensembles of oligoacene molecules attached to argon clusters — •Matthias Bohlen, Moritz Michelbach, Rupert Michiels, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg

The energy conversion efficiency of solar cells is generally limited by the Shockley-Queisser limit [1]. One way to circumvent this limit is through the use of organic photovoltaics (OPV), for which specific charge and energy transfer processes can lead to higher conversion efficiencies. Polyaromatic hydrocarbons, such as oligoacene molecules are promising candidates for OPV applications. In addition to that, these molecules exhibit interesting quantum effects, such as singlet fission, triplet-triplet annihilation or superradiance. Recently anthracene, tetracene and pentacene molecules attached to the surface of neon clusters have been shown to provide interesting model systems for detailed studies of such effects [2]. We have extended these measurements by spectroscopy of oligoacenes deposited onto the surface of argon clusters. The results indicate similar processes as observed for neon clusters, but different magnitudes and timescales of the effects.

[1] W. Shockley and H. J. Queisser, J. Appl. Phys. 32, 510 (1961)

[2] S. Izadnia et al., J. Phys. Chem. Lett. 8,2068 (2017)