Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.13: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D2

Nanotomography of organic heterojunction solar cells — •Mario Zerson¹, Andreas Sperlich², Hannes Kraus², Carsten Deibel², Vladimir Dyakonov², and Robert Magerle¹ — ¹Chemische Physik, TU Chemnitz, D-09107 Chemnitz — ²Experimental Physics VI, Julius-Maximilians-University Würzburg, D-97074 Würzburg

The morphology of organic heterojunction solar cells based on blends of P3HT and PCBM is an important factor determining the power conversion efficiency. For a good charge carrier generation the interface between the two components should be as large as possible. Furthermore, bicontinuous networks of both components are required for an efficient charge carrier extraction. We investigate the three-dimensional structure of P3HT and blends of P3HT and PCBM with Nanotomography based on scanning force microscopy (SFM). The specimen is ablated layer by layer using plasma etching and imaged with tapping mode SFM after each etching step. From the resulting series of images the three-dimensional structure is reconstructed. We will present first volume images of P3HT:PCBM blends and discuss the structure of the interface between donor and acceptor components in view of the charge generation efficiency. Furthermore we investigate the morphology of P3HT and P3HT/PCBM blends using SFM with super-sharp tips and the electro-optical properties at the same samples. We aim at comparing the microstructure of the polymer with the photoluminescence-detected magnetic resonance (PLDMR) which provides information on the recombination kinetics of photoinduced charges.