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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.51: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Bulk heterojunction solar cells from low bandgap polymer and PCBM — •Martin Knipper¹, Anja Henckens², Laurence Lutsen², Jean Manca², and Dirk Vanderzande² — ¹Energy- and Semiconductor Research Laboratory, Institut of Physics, University of Oldenburg, D26111 Oldenburg, Germany — ²Limburgs Universitair Centrum, Department SBG/SCH universitaire campus D, B3590 Diepenbeek, Belgium

Low bandgap bulk heterojunction solar cells were made from a precursor polymer mixed with [6,6]-phenyl C₆₁-butyric acid methyl ester (PCBM). This mixture is spincoated onto an indiumtinoxid (ITO) substrate covered with PEDOT:PSS. The conversion in film to the conducting low band gap (1.4 eV) polymer polythienylenevinylene (PTV) is made by heat treatment. Finally lithiumfluoride (LiF) and aluminum contacts were thermally evaporated. JV-characteristics under 1.5 AM illumination (100mW/cm²) are taken at room temperature after the evaporation and several times after post production heat treatments. We see an high increase in solar cell performance with the post production treatment. All main solar cell parameters (open-circuit voltage, short-circuit current density and fillig factor) increase. By varying the weight concentration of PCBM with respect to the precursor PTV we found an optimal ratio around 1:1. With these conditions and without further optimisation we get a solar cell efficiency of 0.63%.