Nonfused Nonfullerene Acceptors With an A-D-A'-D-A Framework and a Benzothiadiazole Core for High-Performance Organic Solar Cells
Document Type
Article
Publication Date
3-19-2020
School
Polymer Science and Engineering
Abstract
Nonfullerene acceptors (NFAs) have contributed significantly to the progress of organic solar cells (OSCs). However, most NFAs feature a large fused-ring backbone, which usually requires a tedious multiple-step synthesis, and are not applicable to commercial applications. An alternative strategy is to develop nonfused NFAs, which possess synthetic simplicity and facile tunability in optoelectronic properties and solid-state microstructures. In this work, we report two nonfused NFAs, BTCIC and BTCIC-4Cl, based on an A–D–A′–D–A architecture, which possess the same electron-deficient benzothiadiazole central core but different electron-withdrawing terminal groups. The optical properties, energy levels, and molecular crystallinities were finely tuned by changing the terminal groups. Moreover, a decent power conversion efficiency of 9.3 and 10.5% has been achieved by BTCIC and BTCIC-4Cl, respectively, by blending them with an appropriate polymer donor. These results demonstrate the potential of A–D–A′–D–A type nonfused NFAs for high-performance OSCs. Further development of nonfused NFAs will be very fruitful by employing appropriate building blocks and via side-chain optimizations.
Publication Title
ACS Applied Materials and Interfaces
Volume
12
Issue
14
First Page
16531
Last Page
16540
Recommended Citation
Pang, S.,
Zhou, X.,
Zhang, S.,
Tang, H.,
Dhakal, S.,
Gu, X.,
Duan, C.,
Huang, F.,
Cao, Y.
(2020). Nonfused Nonfullerene Acceptors With an A-D-A'-D-A Framework and a Benzothiadiazole Core for High-Performance Organic Solar Cells. ACS Applied Materials and Interfaces, 12(14), 16531-16540.
Available at: https://aquila.usm.edu/fac_pubs/17307