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. 2017 May 31;139(21):7148-7151.
doi: 10.1021/jacs.7b02677. Epub 2017 May 22.

Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells

Wenchao Zhao  1   2 , Sunsun Li  1   2 , Huifeng Yao  1   2 , Shaoqing Zhang  1   2 , Yun Zhang  1   2 , Bei Yang  1   2 , Jianhui Hou  1   2
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Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells

Wenchao Zhao et al. J Am Chem Soc. .

Abstract

A new polymer donor (PBDB-T-SF) and a new small molecule acceptor (IT-4F) for fullerene-free organic solar cells (OSCs) were designed and synthesized. The influences of fluorination on the absorption spectra, molecular energy levels, and charge mobilities of the donor and acceptor were systematically studied. The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency of 13.1%, and an efficiency of over 12% can be obtained with a thickness of 100-200 nm, suggesting the promise of fullerene-free OSCs in practical applications.

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