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HL: Fachverband Halbleiterphysik
HL 46: Organic Photovoltaics I
HL 46.5: Talk
Wednesday, March 16, 2011, 11:15–11:30, FOE Anorg
Electronic Trap States in Methanofullerenes and their Influence on Organic Solar Cells — •Julia Schafferhans1, Carsten Deibel1, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Physical Institute, Julius-Maximilians University of Würzburg, Am Hubland, D-97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern e.V.), Am Hubland, D-97074 Würzburg, Germany
Methanofullerenes are the most commonly used electron acceptors in organic bulk heterojunction solar cells, due to their advantages that they can be easily processed from solution, possess a high electron affinity and form segregated phases in blends with common donor polymers.
Although trap states can have a significant impact on the performance of organic solar cells, as they can act as recombination centers, lower the mobility and disturb the internal field distribution, the traps in methanofullerenes have not been matter of research so far.
We investigated the trap states of three commonly used fullerene derivatives, namely PC61BM, PC71BM and bisPC61BM, by thermally stimulated current measurements. Each of the studied methanofullerenes exhibit a broad trap distribution, whereby the PC71BM and bisPC61BM reveal significantly deeper traps compared to PC61BM. These findings will be discussed with respect to the solar cell performance.