Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 32, Pages 15433-15455Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta04718a
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [91433202, 21773262, 21521062, 21276059, 91227112]
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Organic photovoltaics (OPVs) represent one of the potential candidates of next-generation solar cells for converting green and sustainable solar energy into electrical power. An OPV cell utilizes a blend of electron donor (D) and electron acceptor (A) materials as photo-active layers, where photogenerated excitons are separated into mobile electrons and holes. Relative to fullerene acceptors, nonfullerene small-molecule acceptors (NF-SMAs) have several advantages such as synthesis-facile chemical modifications and straightforward tunability in absorptivity, spectral coverage, optical band gap, and Frontier molecular orbitals. In the recent 3 years, progress in design and synthesis of fused-ring NF-SMAs with perpendicular side-chains on an electron-rich core, and again, on design and synthesis of wide/medium/low band gap polymer donors have led to realizations of over 13% power conversion efficiencies (PCEs). These rapid advances require timely review articles. In this review article, we focus on this type of fused-ring NF-SMAs reported in the past 3 years, with special attention on their molecular structure design and structure-property relationships.
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