Design and Synthesis of a Low Bandgap Small Molecule Acceptor for Efficient Polymer Solar Cells.

Yao, Huifeng; Chen, Yu; Qin, Yunpeng; Yu, Runnan; Cui, Yong; Yang, Bei; Li, Sunsun; Zhang, Kai et al. · Adv Mater · 2016

basic_science · Level V

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Abstract

A novel non-fullerene acceptor, possessing a very low bandgap of 1.34 eV and a high-lying lowest unoccupied molecular orbital level of -3.95 eV, is designed and synthesized by introducing electron-donating alkoxy groups to the backbone of a conjugated small molecule. Impressive power conversion efficiencies of 8.4% and 10.7% are obtained for fabricated single and tandem polymer solar cells.