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• W2191932912 abstract "Palladium (Pd) is commonly used as a catalyst in the polymerisation of conjugated polymers such as poly[N-9′-heptadecanyl-2,7-carbozole-alt-5,5-(4′,7′-di-2-thenyl-2′,1′,3′-benzothiadiazole)] (PCDTBT). Here we explore the effect of residual catalyst on the performance of organic photovoltaic devices (OPVs) based on a PCDTBT:fullerene thin-film blend. We find that as the relative concentration of Pd increases, the power conversion efficiency of the PV is reduced, dropping from 4.55% to 2.42% as the Pd concentration was increased to 2570 ppm (relative to that of the PCDTBT). This reduction in efficiency resulted primarily from a reduction in PV fill factor and shunt-resistance, indicating the presence of current-shunts within the device. Using optical microscopy, laser beam induced current mapping and scanning electron microscopy, we are able to demonstrate that such current shunts are associated with micron-sized aggregates of Pd-containing nanoparticles. We show that the presence of high concentrations of Pd within a PCDTBT OPV contribute to a larger drop in efficiency during the initial ‘burn-in’ period." @default.
• W2191932912 created "2016-06-24" @default.
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• W2191932912 date "2015-12-01" @default.
• W2191932912 modified "2023-09-26" @default.
• W2191932912 title "The effect of residual palladium catalyst on the performance and stability of PCDTBT:PC70BM organic solar cells" @default.
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• W2191932912 doi "https://doi.org/10.1016/j.orgel.2015.10.001" @default.
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