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HL: Fachverband Halbleiterphysik
HL 17: Organic Semiconductors: Solar Cells I (Joint Session with DS/CPP/O)
HL 17.7: Talk
Monday, March 22, 2010, 17:30–17:45, H15
Charge Carrier Generation Yield in Organic Solar Cells using a C80 Derivative as Acceptor — •Moritz Liedtke1,2, Andreas Sperlich2, Hannes Kraus2, Andreas Baumann2, Carsten Deibel2, Vladimir Dyakonov1,2, and Claudia Cardona3 — 1Centre for Applied Energy Research (ZAE Bayern e. V.), Am Hubland, D-97074 Würzburg, Germany — 2Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, Am Hubland, D-97074 Würzburg — 3Luna Innovations Incorporated, 521 Bridge Street, Danville, VA 24541 (USA)
Organic solar cells (OSC) with C70 and C80 fullerenes show a higher open circuit voltage (Voc) than the standard [6,6]-phenyl-C[61]-butyric acid methyl ester (PCBM):poly-3-hexylthiophene (P3HT) bulkheterojunction cells. Devices containing the trimetallic nitride endohedral fullerene Lu3:N@C80 showed a Voc of 910mV compared to 600mV with C60-PCBM. Still the overall efficiency of these cells remain below the performance of our C60-PCBM:P3HT reference cells. We address the origin of the lower efficiency by means of optical, magnetic and current measurement techniques. In samples containing Lu3:N@C80 we found photoluminescence quenching 3.2 times weaker, triplet yield higher and short-cut current about 2mA/cm2 lower than in cells with C60-PCBM as acceptor. We conclude that less efficient charge carrier generation in the Lu3:N@C80:P3HT bulkheterojunction system is the reason for the lower photocurrent.
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