Regioregular Terpolymers for High-Performance Organic Photovoltaic Devices
YOUNGU LEE a
a Daegu Gyeongbuk Institute of Science and Technology, 333 Techno Jungang Daero, Hyeonpung-Myeon, Dalseong-Gun, Daegu, 711, Korea, Republic of
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, YOUNGU LEE, 028
Publication date: 11th February 2019

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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