Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.47: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Limitating factors in Phenyl-substituted rylenes as electron acceptors associated with P3HT donor in bulk heterojunction solar cells. — •Julien Gorenflot¹, Maria Hammer¹, Andreas Sperlich¹, Andreas Baumann¹, Aleksey Vasilev³, Martin Baumgarten³, Chen Li³, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Julius-Maximilians-University of Würzburg, Institute of Physics, Experimental Physics VI, D-97074 Würzburg — ²Bavarian Centre for Applied Energy Research e.V. (ZAE Bayern), D-97074 Würzburg — ³Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz

In the quest for new efficient electron acceptor/donor couples for bulk heterojunction organic solar cells, we report the study of an important family of electron acceptors: rylenes were investigated as associated with P3HT. Photophysical studies including photoluminescence, steady-state photo-induced absorption ans electron spin resonance confirmed the good charge generation properties of TDI:P3HT blends. Nevertheless no correlation could be established between generated charges and devices performances. Further studies of this mismatch were carried out by investigating the charge transport properties of the materials using Charge Extraction by Linearly Increasing Voltage as well as Field Effect Transistor measurements. The acceptors and donor were varied in order to maximize the charge separation driving force. Those experiments enabled to emphasize two key limiting factors for bulk heterojunction solar cells: charge transport ability of each material and morphological compatibility of the blended components.