Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Terpolymers have emerged for an alternative molecular design strategy of conjugated polymers with distinct optoelectronic properties. The terpolymers comprise three components with two different donor units and one acceptor unit or with one donor unit and two different acceptor units on their conjugated polymer backbones. Therefore, terpolymers allow the integration of the advantages of different donor and acceptor units to attain well controlled physical properties. However, the terpolymers tend to cause variation in the molecular sequences of different three moieties, which can lead to randomly arranged donor and acceptor units on their polymer backbones. This random arrangement in the terpolymers can give rise to the numerous molecular chromophores with intricate hybridization of molecular orbitals and reduce intermolecular π-π stacking interactions which may result in unanticipated trap sites and limit charge transport in polymer films. Furthermore, the batch to batch variation of the terpolymers can be intensified due to their regiorandom arrangement, which makes it difficult to control and reproduce their physical properties. The regioregular terpolymers with perfectly arranged donor and acceptor moieties tend to reduce the batch-to-batch variation and maintain uniformly their physical properties owing to their well-defined structures which can provide precise electronic structures with molecular ordering tendency and more favorable morphology for high-efficiency organic photovoltaic devices (OPVs). Several research groups have reported the promising prospect in the photovoltaic performance of regioregular terpolymers with an D1-A-D2-A repeating units using diketopyrrolopyrrole, benzo[2,1,3]thiadiazole, or fluoro-2,1,3-benzothiadiazole. However, regioregular terpolymers containing thieno[3,4-b]thiophene (TT) segment which is one of the most famous acceptor unit for high-efficiency OPVs have not been synthesized yet because of synthetic difficulty in controlling TT orientation in the polymer backbone. In this talk, I will present the synthesis and characterization of new regioregular terpolymers with perfectly controlled TT (A) orientation. The new terpolymer based BHJ OPV device exhibited a Voc of 0.82 V, a FF of 63.82% and a Jsc of 19.72 mA/cm2, resulting in an excellent PCE of 10.31%.
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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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