Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 32, Pages 17720-17725Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106753
Keywords
molecular rigidity; noncovalently fused-ring electron acceptors; organic solar cells; terminal side chains
Categories
Funding
- NSFC [21774130, 51925306]
- National KeyR&DProgram of China [2018FYA 0305800]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-2]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]
- International Partnership Program of Chinese Academy of Sciences [211211KYSB20170014]
- China Postdoctoral Science Foundation [2020M670425]
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Side-chain engineering is an effective strategy for regulating solubility and packing behavior of organic materials. The introduction of terminal side-chains in a new noncovalently fused-ring electron acceptor has shown to enhance molecular rigidity and intermolecular pi-pi stacking, resulting in record power conversion efficiency for organic solar cells.
Side-chain engineering is an effective strategy to regulate the solubility and packing behavior of organic materials. Recently, a unique strategy, so-called terminal side-chain (T-SC) engineering, has attracted much attention in the field of organic solar cells (OSCs), but there is a lack of deep understanding of the mechanism. Herein, a new noncovalently fused-ring electron acceptor (NFREA) containing two T-SCs (NoCA-5) was designed and synthesized. Introduction of T-SCs can enhance molecular rigidity and intermolecular pi-pi stacking, which is confirmed by the smaller Stokes shift value, lower reorganization free energy, and shorter pi-pi stacking distance in comparison to NoCA-1. Hence, the NoCA-5-based device exhibits a record power conversion efficiency (PCE) of 14.82 % in labs and a certified PCE of 14.5 %, resulting from a high electron mobility, a short charge-extraction time, a small Urbach energy (E-u), and a favorable phase separation.
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