Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We show that it is possible to fabricate PCDTBT:PC70BM devices using a blend of carbon disulfide and acetone with power conversion efficiencies (PCEs) of 6.75% in comparison to 5.80% for the chlorobenzene reference device. Similarly PFDT2BT-8 devices cast from a blend of CS2:Acetone are capable of achieving efficiencies of 6.81% compared to record efficiencies of 6.2% for this material.[1] In addition device cast from the non-halogenated blend show a reduced degredation in performance under continuous testing indicating that they have higher stability and longer lifetimes. The increases in efficiency observed are strongly coupled to the increase in fill factor (FF) and the short circuit current density (Jsc) in addition a small increase in open circuit voltage (Voc) is observed. It has been observed that casting from a mixture of CS2:Acetone leads to an enrichment of the electron extracting interface with PC70BM and an increase in the charge carrier mobility brought about by an increased degree of crystallinity within the PC70BM. The efficiency achieved using this non-halogenated solvent blend is comparable to record efficiencies for PCDTBT:PC70BM using this device architecture and for PFDT2BT-8 devices far exceeds previously reported record efficiencies.[1,2]
[1] Watters, D. C.; Yi, H.; Pearson, A. J.; Kinglsey, J.; Iraqi, A.; Lidzey, D. G. Fluorene-Based Co-polymer with High Hole Mobility and Device Performance in Bulk Heterojunction Organic Solar Cells. Macromolecular Rapid Communications 2013,34, 1157-1162 [2] Sun, Y.; Takacs, C. J.; Cowan, S. R.; Seo, J. H.; Gong, X.; Roy, A.; Heeger, A. J. Efficient, Air-Stable Bulk Heterojunction Polymer Solar Cells Using MoOx as the Anode Interfacial Layer. Advanced Materials 2011, 23, 2226-2230
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