Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Organic Electronics and Photovoltaics IV - Excitonic Properties and Light-Emitting Devices

CPP 57.12: Vortrag

Donnerstag, 4. April 2019, 18:00–18:15, H18

Correlated Atomic Force Microscopy and Spatially-resolved Photoluminescence Spectroscopy Study of Merocyanine Aggregate Thin Films — •Lukas Böhner, Thorsten Limböck, Dirk Hertel, Klas Lindfors, and Klaus Meerholz — University of Cologne, Köln

Merocyanine molecules are interesting materials for organic solar cells (OSCs) due to their high absorption coefficients [1]. Large area OSCs can be produced at low cost. However, the in this way resulting disordered structure of the active material in OSCs is disadvantageous in terms of exciton- and charge mobility. One strategy to increase order in organic materials is the utilization of molecular aggregates wherein excitons are delocalized. Additionally aggregation of organic dye molecules leads to drastic changes of the optical properties compared to the monomeric form [2]. Here, we study thin films of merocyanine molecular aggregates fabricated by vacuum deposition. The morphology of the films is varied by using different substrates and controlling the deposition parameters. Combining atomic force microscopy and photoluminescence microspectroscopy we are able to correlate the structural and optical properties of the aggregates. We find that by suitable choice of the fabrication parameters, thin films consisting of crystalline domains which scale in the range of tens of micrometers can be obtained. We will present the impact of molecular order on exciton and charge transport properties. References: [1] H. Bürckstümmer, et al., Angew. Chemie - Int. Ed. 2011, 50, 11628-11632. [2] A. Liess, et al., Adv. Funct. Mater. 2018, 1805058, 1-9.