Intrinsically Chemo- and Thermostable Electron Acceptors for Efficient Organic Solar Cells
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AbstractThe traditional preparation of non-fullerene acceptors (NFAs) via Knoevenagel condensation reaction (KCR) of aldehyde and active methylene leaves vulnerable and reversible exocyclic vinyl bonds in structures, which undermine the intrinsic chemo- and photostability of NFAs. In this work, we demonstrate a new access to acceptor-donor-acceptor (A-D-A) NFAs via Stille coupling between new electron deficient groups and classic donor core in over 90% yield, wherein the robust carbon-carbon bonds, replacing the exocyclic double bonds from traditional KCR, result in stable A-D-A acceptors, Q1-XF (X representing 0, 2 and 4 fluorine atoms, respectively). Among the three studied examples, Q1-4F exhibits improved optoelectronic and electron transport properties, leading to the best photovoltaic performance with optimal charge kinetics for Q1-4F based OSCs. Overall, this strategy can lead to a new way for developing stable photovoltaic materials.
All Author(s) ListZhang QQ, Li YK, Wang D, Chen Z, Li YH, Li SX, Zhu HM, Lu XH, Chen HZ, Li CZ
Journal nameBulletin of the Chemical Society of Japan
Year2021
Month1
Volume Number94
Issue Number1
PublisherCHEMICAL SOC JAPAN
Pages183 - 190
ISSN0009-2673
eISSN1348-0634
LanguagesEnglish-United Kingdom
KeywordsOrganic solar cells, Non-fullerene acceptors, Stability
Web of Science Subject CategoriesChemistry, Multidisciplinary;Chemistry

Last updated on 2021-22-06 at 00:14