Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202209580
Keywords
Central Unit; Fluorination; Non-Fullerene Acceptor; Solar Cells; Y-series
Categories
Funding
- NSFC [21935007, 52025033, 51873089, 52073056]
- MoST of China [2019YFA0705900]
- Tianjin city [20JCZDJC00740]
- 111 Project [B12015]
- 100 Young Academic Leaders Program of Nankai University [020-ZB22000110, 020-92220002]
- Haihe Laboratory of Sustainable Chemical Transformations
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Halogenation of the central units of state-of-the-art Y-series acceptors has been proven to significantly improve the power conversion efficiencies of organic solar cells. In this study, two acceptors, CH6 and CH4, featuring a conjugation-extended phenazine central unit with and without fluorination, were synthesized. The fluorinated CH6 showed enhanced molecular interactions and crystallinity, superior fibrillar network morphology, and improved charge generation and transport, resulting in a higher power conversion efficiency compared to the non-fluorinated CH4.
Halogenation of terminal of acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs). Similar significant results could be expected from the halogenation of the central units of state-of-the-art Y-series acceptors. Herein, a pair of acceptors, termed CH6 and CH4, featuring a conjugation-extended phenazine central unit with and without fluorination, have been synthesized. The fluorinated CH6 has enhanced molecular interactions and crystallinity, superior fibrillar network morphology and improved charge generation and transport in blend films, thus affording a higher PCE of 18.33 % for CH6-based binary OSCs compared to 16.49 % for the non-fluorinated CH4. The new central site offers further opportunities for structural optimization of Y-series molecules to afford better-performed OSCs and reveals the effectiveness of fluorination on central units.
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