Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.31: Poster
Donnerstag, 14. März 2013, 17:00–20:00, Poster B2
Organic heterojunctions for photovoltaic applications - How does structure influence performance? — •Ingolf Segger, Stefan Klaes, Ulrike Kuck, Dominik Meyer, Christian Effertz, and Matthias Wuttig — Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany
Organic donor-acceptor heterojunctions are arguably the most promising system for the use as active layers in organic solar cells. Their key feature is a very efficient exciton dissociation at the interface between donor and acceptor which is crucial for device operation. Hence, one way towards high performance organic solar cells is the enlargement of the interface area, which can be achieved by simultaneous processing of donor and acceptor in order to deposit bulk heterojunctions. For certain donor-acceptor combinations significant performance improvements for bulk heterojunctions over simple bi-layer systems have already been demonstrated.
For this study we have produced small molecule bi-layers and bulk heterojunctions based on Copper Phtalocyanine as a donor and C60 as well as PTCDI-C13 as acceptor materials. The structure of the resulting films can be tuned over a wide range by employing different substrate temperatures during evaporation in ultrahigh vacuum.
Here we present our results on the influence of structural properties on absorption, charge transport and device performance which were investigated by means of x-ray diffraction, optical spectroscopy and electrical measurements.