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Published on: June 10, 2021
High-Performance Simple Nonfused Ring Electron Acceptors with Diphenylamino Flanking Groups
Xiaodong Wang1, Hao Lu1, Jiadong Zhou2
1Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Abstract:
Four simple nonfused ring electron acceptors (H-2F, CH-2F, OCH-2F, and SCH-2F) were designed and synthesized. The use of diphenylamine derivatives as the flanking group for the construction of nonfused ring electron acceptors can improve solubility, avoid the formation of oversized aggregates, and enhance the intramolecular charge-transfer effect to extend absorption spectra. The substituent group at the diphenylamine unit has a great impact on the absorption and energy level of acceptors, electron mobility and morphology of blend films. Unlike the other three acceptors, CH-2F can form ordered molecular stacking and a face-on orientation in the donor/acceptor blend film. A single-crystal analysis demonstrates that CH-2F can form a two-dimensional electron transport network. Among these four acceptors, CH-2F-based organic solar cells provide the highest PCE of 12.28%. Our work has demonstrated that triarylamine is a helpful construction unit for low-cost and high efficiency nonfused ring electron acceptors.
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