Abstract
For the utilization in the polymer solar cells, conjugated polymers were synthesized using electron-deficient units, 2-{3-[4,6-bis-(4-hexyl-thiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4-b]pyridine (mTP) or 2-{4-[4,6-bis-(4-hexylthiophen-2-yl)-pyrimidin-2-yl]-phenyl}-thiazolo[5,4-b]pyridine (pTP). To increase the electron-deficiency of the pyrimidine unit, thiazolopyridine (TP), strong electron-withdrawing group, was incorporated at the meta-/para-position of the phenylene connector which is attached to the pyrimidine. It was confirmed that the TP unit at para-position has stronger intramolecular charge transfer (ICT) effect to shift the absorption to the longer wavelength region and deepens the highest occupied molecular orbital (HOMO) energy level. The polymers with 4-(1-octylnonyl)-6-(2-thienyl)-4H-thieno[3,2,-b]indole (TTI) having the decent solubility for the morphology show the superior open-circuit voltage (V OC ) value of the mTTI/pTTI devices compared to the others. Also, the polymers with TTI show increased short-circuit current (J SC ), fill factor (FF), and power conversion efficiency (PCE) due to high face-on populations.
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Acknowledgments: This study was financially supported by the 『2017 Post-Doc. Development Program』 of Pusan National University.
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Kim, J., Chae, S., Yi, A. et al. Syntheses and Properties of Semiconducting Polymers Based on Pyrimidine Series Substituted with Thiazolo-Pyridine. Macromol. Res. 26, 438–445 (2018). https://doi.org/10.1007/s13233-018-6063-7
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DOI: https://doi.org/10.1007/s13233-018-6063-7