Abstract
Four new low-band-gap alternating copolymers (P-1, P-2, P-3 and P-4) based on electron-rich benzodithiophene and newly developed electron-deficient units, thienopyrazine or dithiadiazatrindene derivatives, were synthesized by Stille polycondensation. All polymers exhibit good solubility in common organic solvents and a broad absorption band in the visible to near-infrared regions. The film optical band gaps of the polymers are in the range of 1.28–2.07 eV and the highest occupied molecular orbital (HOMO) energy levels are in the range of −4.99 eV to −5.28 eV. Bulk heterojunction polymer solar cells (PSCs) of the polymers were fabricated with phenyl-C61-butyric acid methyl ester (PC61BM) as acceptor material, and a power conversion efficiency of 0.80% was realized with P-1 as donor material.
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This work was financially supported by the Russian Foundation for Basic Research (GFEN_a No. 12-03-91175) and the National Natural Science Foundation of China (No. 51211120187).
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Keshtov, M.L., Marochkin, D.V., Fu, Yy. et al. Thienopyrazine or dithiadiazatrindene containing low band gap conjugated polymers for polymer solar cells. Chin J Polym Sci 32, 844–853 (2014). https://doi.org/10.1007/s10118-014-1458-1
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DOI: https://doi.org/10.1007/s10118-014-1458-1