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• W3088357576 abstract "Development of high-performance small-molecular acceptors (SMAs) and an eco-friendly and simple device fabrication procedure is very crucial for scalable production of polymer solar cells (PSCs) in the future. Here, we designed and synthesized two new nonacyclic SMAs (IPYT-IC and IPYT-ICF) featuring an A–DA′D–A-type molecular configuration, in which an electron-deficient 6,12-dihydro-diindolo[1,2-b:10,20-e]pyrazine (IPY) moiety was used as the additional acceptor unit (A′) and fused with the electron-rich diarylcyclopentadienylthiophene segment (D) to form a DA′D-type central core (IPYT), and 3-(dicyanomethylidene)indol-1-one (IC) or 5,6-difluoro-3-(dicyanomethylene)indol-1-one (ICF) acted as the terminal acceptor group (A). The rigid coplanar DA′D-type core containing a weakly electron-deficient IPY unit is beneficial to broaden the absorption range, improve light-harvesting ability, reduce the band gap, upshift the lowest unoccupied molecular orbital (LUMO) energy level, and enhance the charge transport of the resultant SMAs. Meanwhile, with respect to IPYT-IC, fluorinated IPYT-ICF exhibits a stronger absorption with a narrower band gap, higher electron mobility, and lower-lying highest occupied molecular orbital/LUMO energy levels. The as-cast PSCs based on IPYT-ICF using the polymer PTB7-Th as an electron donor achieve a power conversion efficiency of up to 7.00% with eco-friendly o-xylene (XY) as the processing solvent without any additive and post-treatment, which is higher than that of devices based on IPYT-IC (4.50%) mainly originating from the larger Jsc and FF because of the higher carrier mobilities, better charge transport and collection properties, weaker charge recombination, and superior film morphology. However, IPYT-IC-based devices present an outstanding Voc of up to 0.98 V because the weakly electron-deficient A′ unit (IPY) upshifts LUMO levels of these SMAs. Our results illustrate that the weakly electron-deficient IPY can be a promising A′ unit to develop efficient A–DA′D–A-type SMAs for additive-free and eco-friendly as-cast PSCs." @default.
• W3088357576 created "2020-10-01" @default.
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• W3088357576 date "2020-09-18" @default.
• W3088357576 modified "2023-09-27" @default.
• W3088357576 title "Development of A–DA′D–A Small-Molecular Acceptors Based on a 6,12-Dihydro-diindolo[1,2-<i>b</i>:10,20-<i>e</i>]pyrazine Unit for Efficient As-Cast Polymer Solar Cells" @default.
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• W3088357576 doi "https://doi.org/10.1021/acs.jpcc.0c07557" @default.
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