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Issue 3, 2019
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A wide bandgap conjugated polymer donor based on alkoxyl-fluorophenyl substituted benzodithiophene for high performance non-fullerene polymer solar cells

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Abstract

A new wide bandgap (WBG) conjugated polymer PFOPB based on a fluorinated-alkoxyphenyl benzodithiophene donor unit and a benzodithiophene-4,8-dione acceptor unit was designed and synthesized for application as a donor in non-fullerene (NF) polymer solar cells (PSCs). In order to investigate the effect of side chain fluorination on the photovoltaic performance, a corresponding non-fluorinated polymer POPB was also synthesized as a comparison material. Compared to POPB with a bandgap of 1.81 eV, a highest occupied molecular orbital (HOMO) energy level of −5.38 eV, an extinction coefficient of 5.31 × 104 cm−1 at 577 nm and a hole mobility of 3.96 × 10−4 cm2 V−1 s−1, the fluorinated polymer PFOPB possesses a wider bandgap of 1.86 eV, a deeper HOMO level of −5.50 eV, a higher extinction coefficient of 8.45 × 104 cm−1 at 612 nm and a higher hole mobility of 1.51 × 10−3 cm2 V−1 s−1. The PFOPB:IT-4F-based PSCs exhibit a much higher power conversion efficiency (PCE) of 11.7% than POPB:IT-4F-based devices (6.2%). These results suggest that side-chain fluorination is an effective strategy to improve the optoelectronic properties of WBG polymers in NF-PSCs.

Graphical abstract: A wide bandgap conjugated polymer donor based on alkoxyl-fluorophenyl substituted benzodithiophene for high performance non-fullerene polymer solar cells

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Publication details

The article was received on 16 Nov 2018, accepted on 12 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA11006A
Citation: J. Mater. Chem. A, 2019,7, 1307-1314
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    A wide bandgap conjugated polymer donor based on alkoxyl-fluorophenyl substituted benzodithiophene for high performance non-fullerene polymer solar cells

    W. Li, G. Li, H. Guo, X. Guo, B. Guo, Q. Zhu, Q. Fan, W. Ma, M. Zhang and Y. Li, J. Mater. Chem. A, 2019, 7, 1307
    DOI: 10.1039/C8TA11006A

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