Abstract
A new benzodithiophene based donor-acceptor π-conjugated polymer (P1) is designed and explored as the photoactive donor for organic solar cells (OSCs). The synthesized donor polymer, P1 displays a wide absorption profile ranging from 300–750 nm with optical band gap of 1.61 eV and moderate ionization potential of −5.30 eV. It has good solubility in non-halogenated and halogenated organic solvents. Next, we fabricated OSCs with P1 by blending with PC71BM, the pristine polymer processed from chlorobenzene showed PCE of 2.79%. Upon addition of external additive diphenyl ether to the blend showed a dramatic improvement in PCE with maximum of 5.33%. DPE tailored the active layer morphology and showed two times higher PCE than pristine films. These results clearly indicate that the new polymer has a great potentiality for enhancing efficiency upon solvent additives, which will provide new routes for the development of new class of polymers for high-performance air-stable OSCs.
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Acknowledgment: This study was financially supported by the 2018 Post-Doc. Development Program of Pusan National University.
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Reddy, S.S., Aryal, U.K., Jin, H. et al. A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells. Macromol. Res. 28, 179–183 (2020). https://doi.org/10.1007/s13233-020-8079-z
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DOI: https://doi.org/10.1007/s13233-020-8079-z