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Andreas Distler, Tobias Sauermann, Hans-Joachim Egelhaaf, Sheila Rodman, Dave Waller, Kap-Soo Cheon, Mike Lee and Dirk M. Guldi The Effect of PCBM Dimerization on the Performance of Bulk Heterojunction Solar Cells Advanced Energy Materials 4

Version of Record online: 6 AUG 2013 | DOI: 10.1002/aenm.201300693

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The light stability of poly[4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-[2,5-bis(3-tetradecylthiophen-2-yl)thiazole[5,4-d]thiazole)-1,8-diyl] (PDTSTzTz):[6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) solar cells is investigated. The photoinduced dimerization of the fullerene is responsible for the observed degradation. Both the dimerization and the associated device performance loss are found to be reversible upon annealing. The use of bisPC60BM prevents this degradation mechanism.

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