Effect of fullerene acceptor on the performance of solar cells based on PffBT4T-2OD
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We have studied bulk-heterojunction (BHJ) solar cells composed of the polymer PffBT4T-2OD as electron donor and three different electron accepting fullerenes, namely PC71BM, PC61BM and indene-C60-bis-adduct (ICBA) in order to understand the impact of different fullerenes on the morphology and efficiency of the corresponding photovoltaic devices. Despite PffBT4T-2OD:ICBA devices being characterised by higher values of Voc, they display the lowest power conversion efficiency (PCE) due to their lower Jsc and FF values. We find that although all blend films have similar morphologies, X-ray scattering indicates a reduced degree of order within the fullerene domains in the ICBA-based film. Due to the high LUMO level of ICBA, the corresponding blends are characterised by a lower initial exciton dissociation and this associated with the reduced ordering within the ICBA domains results in increased geminate recombination of the photogenerated electrons in the fullerene-rich domains and a consequently reduced PCE of the corresponding devices.
Zhang , Y , Parnell , A J , Blaszczyk , O , Musser , A J , Samuel , I D W , Lidzey , D G & Bernardo , G 2018 , ' Effect of fullerene acceptor on the performance of solar cells based on PffBT4T-2OD ' , Physical Chemistry Chemical Physics , vol. 20 , no. 28 , pp. 19023-19029 . https://doi.org/10.1039/c8cp02195c
Physical Chemistry Chemical Physics
© 2018 The Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1039/C8CP02195C
DescriptionY. Z., O. B., and I. D. W. S. acknowledge financial support from the European Research Council (EXCITON grant 321305). I. D. W. S. acknowledges a Royal Society Wolfson Research Merit Award. G. B. thanks the European Commission for a Marie Sklodowska Curie Individual Fellowship (FP7/H2020 – Grant agreement number: 658391). We thank the EPSRC for financial support via grants EP/I028641/1 “Polymer/fullerene photovoltaic devices: new materials and innovative processes for high-volume manufacture”, EP/J017361/1 “Supergen Supersolar Hub”, EP/M025020/1 “High resolution mapping of performance and degradation mechanisms in printable photovoltaic devices” and EP/M025330/1, “Hybrid Polaritonics”.
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