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Realizing an Unprecedented Fill Factor of 82.2% in Ternary Organic Solar Cells via Co-Crystallization of Non-Fullerene Acceptors.
- Source :
- Advanced Functional Materials; 11/23/2023, Vol. 33 Issue 48, p1-9, 9p
- Publication Year :
- 2023
-
Abstract
- Ternary strategy is demonstrated as an efficient approach to achieve high short-circuit current and open-circuit voltage to boost the performance of organic solar cells (OSCs), however, the realization of high fill-factor (FF) in ternary OSCs has been rare. In this study, three thiophene terminated non-fullerene acceptors (NFAs) with methyl or chlorine substitutions on their end-groups are designed and synthesized, and further incorporated into the state-of-the-art PM6:L8-BO system to construct ternary OSCs. Subtle changes in their chemical structures significantly modify the molecular packings of these thiophene terminated NFAs. While BTP-ThMe and BTP-ThCl have limited forms of dimer, versatile molecular dimers, including "Z" shaped D-D, "S" shaped A-A, and "F" shaped A-D packings exist in BTP-ThMeCl, which lead to the formation of compact 3D honey-comb network and this is analogous to the host acceptor L8-BO. This synergetic molecular packing between BTP-ThMeCl and L8-BO contributes to maintain the 3D charge transport network in the ternary system via the formation of NFA co-crystals at the molecular level, and consequently realizing a maximum power conversion efficiency of 19.1% with a superior FF of 82.2%, which is the highest FF reported so far for OSCs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1616301X
- Volume :
- 33
- Issue :
- 48
- Database :
- Complementary Index
- Journal :
- Advanced Functional Materials
- Publication Type :
- Academic Journal
- Accession number :
- 174487526
- Full Text :
- https://doi.org/10.1002/adfm.202305765