Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 40: Organic Electronics and Photovoltaics HL-II (jointly with CPP, HL, and O)

DS 40.5: Vortrag

Mittwoch, 16. März 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 Dyakonov^1,2 — 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.