Abstract
We report the synthesis of novel low bandgap conjugated polymer P1 comprising thiazolothiazole, benzothiadiazole and thiophene units and investigation its photovoltaic properties in organic solar cells with [70]PCBM ([6,6]-phenyl-C71-butyric acid methyl ester) and high-performing non-fullerene IT-4F acceptor (9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno [1,2-b:5,6-b’]dithiophene). Polymer P1 showed promising results in both fullerene and non-fullerene organic solar cells. In particular, P1/IT-4F blends demonstrated enhanced charge carrier mobilities and suppressed trap-assisted recombination, which resulted in impressive short-circuit current densities and decent power conversion efficiency of 8.8 % in solar cells. The fullerene-based devices delivered efficiency of 8.2 % with remarkably high open-circuit voltages. The obtained results feature conjugated polymers based on thiazolothiazole as promising absorber materials for organic solar cells.
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