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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster: Organic Semiconductors

CPP 24.13: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Influence of PSS on the Morphology of P3HT:PCBM Solar Cells — •Anna Naumann, Eva M. Herzig, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany

In organic photovoltaics the combination of poly(3-hexylthiophene) (P3HT) and PCBM for the active layer is very promising, but there are still many attempts for further improvement of device efficiency. One approach is to add a third component, like in this case polystyrenesulfonate (PSS), which can increase the performance by almost 30% compared to the reference P3HT:PCBM-cell [1]. PSS is an ionomer, which is neither conductive nor absorbent, hence it has to influence the morphology of the P3HT:PCBM-blend. In our study we analyze the film surface and the crystallization behavior of spin-coated thin films with different mixing ratios with the aid of optical microscopy, atomic force microscopy and x-ray diffraction, respectively. Furthermore, the interaction between substrate and film is of great interest, so an investigation of accumulation layers in the blend is made with reflectivity measurements.

[1] Kim et al. Solar Energy Materials and Solar Cells, 92:1188 (2008)