Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The ability to process Organic Photovoltaic (OPV) devices partly from solution is an attractive characteristic of this disruptive technology for solar energy conversion. An important requirement in the scale-up of these devices is the design of materials and processing routes that enable the high-throughput of solar cell manufacture without sacrificing device efficiency or stability. Whereas several high-performance semiconductor blends are available for use as the light-harvesting layer within OPV devices, extended drying times are often needed for the casting of the blend layer, or additional annealing treatments are applied in order to optimise the nanostructure of the blend for photovolatic performance. These steps can potentially add to the cost and embedded energy of OPV manufacture.
We report the synthesis and characterisation of four novel benzothiadiazole co-polymers containing carbazole or fluorene moities for application in organic photovoltaics. Bulk-heterojunction OPV devices utilising fullerene derivatives as electron acceptors are fabricated with power conversion efficiencies ranging between 4 and 6% and open-circuit voltages of 0.9 V. For our best-performing solar cells we identify an optimised processing route that permits rapid casting of the bulk-heterojunction layer and no application of further annealing steps, ideal for the potential future scale-up of this system. In addition to the characterisation of our highest efficiency devices, we conduct an extended physical study of each copolymer:fullerene blend to provide insight to this new family of co-polymers. Morphological, spectroscopic and charge-transport measurements are used to rationalise the solar cell characteristics and identify the mechanisms of efficiency loss. Although all copolymer:fullerene blend films exhibit comparable fluorescence quenching kinetics and hole polaron yields, solar cell devices with the highest power conversion efficiencies are correlated with high charge-carrier mobilities in the copolymer. Furthermore, by optimising the environmentally friendly processing route of the best performing solar cell system, enhanced efficiencies (up to 6.8%) and device lifetimes are achieved relative to reference cells.
Current-density versus voltage characteristics for copolymer:PC70BM OPV devices under 100 mWcm-2 AM1.5 illumination.
Watters, D.C.; Yi, H.; Pearson, A.J.; Kingsley, 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, 14, 1157-1162 Pearson, A.J.; Watters, D.C.; Yi, H.; Sarjadi, M.S.; Reynolds, L.X.; Marchisio, P.P.; Kingsley, J.; Haque, S.A.; Iraqi, A.; Lidzey, D.G. Impact of dithienyl or thienothiophene units on the optoelectronic and photovoltaic properties of benzo[1,2,5]thiadiazole based donor-acceptor copolymers for organic solar cell devices. (manuscript submitted) Griffin, J.; Pearson, A.J.; Nicolaou, C., Scarratt, N.W.; Yi, H.; Iraqi, A., Cadby, A.; Buckley, A.R.; Lidzey, D.G. Organic photovoltaic devices with enhanced efficiency and lifetime processed from non-halogenated binary solvent blends. (manuscript submitted)
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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