Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.23: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Investigation and tuning of merocyanine dye thin films on ultra-flat substrates — •Thorsten Limböck, Dirk Hertel, and Klaus Meerholz — Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln

Organic solar cells provide a low cost, yet, due to their thin film architecture, versatile alternative to the established silicon-based solar cells. One of the main challenges of organic photovoltaics is the relatively modest power conversion efficiency. To improve on the efficiency, the morphology of each individual layer has to be tuned in order to optimize the absorption, charge generation and charge transport. To investigate the morphology of dipolar molecules a merocyanine dye layer is grown in a controlled environment via vacuum deposition on ultra-flat substrates graphite and mica in comparison to conventional organic photovoltaic electrode materials, such as ITO, MoO₃ or PEDOT. The morphologic behavior of its ordered growth and the changes therein for a variation of different parameters, such as layer thickness, evaporation rate and substrate temperature are investigated via atomic force microscopy and kelvin probe force microscopy. The achievable tuning range stretches from an amorphous form to large scale highly ordered layers with island sizes of several hundred µm². To investigate electric transport properties, organic field-effect transistors are build, which contain engineered layers of the merocyanine dye. The investigation is extended to other merocyanines having a lower polarity.