Abstract
We present the synthesis of a copolymer structure, poly(9,9′-n-di-hexyl-2,7-fluorene-alt-2,5-bithiophene), referred to herein as LaPPS43, and its physico-chemical characterization. Thin films of this polymer mixed with phenyl-C61-butyric acid methyl ester (PCBM) were used as the active layer in photovoltaic devices using the ITO/PEDOT:PSS/LaPPS43:PCBM/Ca/Al bulk heterojunction structure. The devices of different active layer thicknesses were electrically studied using J-V curves and the Photo-Celiv technique. The obtained results show that LaPPS43 combined with PCBM is a promising system for photovoltaic devices. Device performance is discussed in terms of the mean drift distance x for charge carriers. Photophysical data showed that the excitonic species are all localized in the aggregated forms. The mechanism of exciton formation and dissociation is also discussed.
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The authors are indebted to CNPQ, INEO, PIPE, and UFPR for their financial support.
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Grova, I.R., Coutinho, D.J., Faria, R.M. et al. Synthesis and photovoltaic performance of a fluorene-bithiophene copolymer. J Polym Res 20, 119 (2013). https://doi.org/10.1007/s10965-013-0119-3
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DOI: https://doi.org/10.1007/s10965-013-0119-3