A Multifluorination Strategy Toward Wide Bandgap Polymers for Highly Efficient Organic Solar Cells

Jinming Chen; Dongyan Li; Mingbin Su; Yonghong Xiao; Hui Chen; Man Lin; Xiaolan Qiao; Li Dang; Xiao-Chun Huang; Feng He; Qinghe Wu

doi:10.1002/anie.202215930

A Multifluorination Strategy Toward Wide Bandgap Polymers for Highly Efficient Organic Solar Cells

Angew Chem Int Ed Engl. 2023 Mar 1;62(10):e202215930. doi: 10.1002/anie.202215930. Epub 2023 Jan 26.

Authors

Jinming Chen¹, Dongyan Li¹, Mingbin Su¹, Yonghong Xiao¹, Hui Chen², Man Lin¹, Xiaolan Qiao³, Li Dang¹, Xiao-Chun Huang^{1

4}, Feng He^{2

5}, Qinghe Wu^{1

4}

Affiliations

¹ Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong, Shantou University, Shantou, Guangdong, 515063, China.
² Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology, Shenzhen, 518055, China.
³ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
⁴ Chemistry and Chemical Engineering Guangdong Laboratory, Shantou, 515063, China.
⁵ Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China.

PMID: 36629745
DOI: 10.1002/anie.202215930

Abstract

Creating new electron-deficient unit is highly demanded to develop high-performance polymer donors for non-fullerene organic solar cells (OSCs). Herein, we reported a multifluorinated unit 4,5,6,7-tetrafluoronaphtho[2,1-b : 3,4-b']dithio-phene (FNT) and its polymers PFNT-F and PFNT-Cl. The advantages of multifluorination: (1) it enables the polymers to exhibit low-lying HOMO (≈-5.5 eV) and wide band gap (≈2.0 eV); (2) the short interactions (F⋅⋅⋅H, F⋅⋅⋅F) endow the polymers with properties of high film crystallinity and efficient hole transport; (3) well miscibility with NFAs that leads to a more well-defined nanofibrous morphology and face-on orientation in the blend films. Therefore, the PFNT-F/Cl : N3 based OSCs exhibit impressive FF values of 0.80, and remarkable PCEs of 17.53 % and 18.10 %, which make them ranked the best donor materials in OSCs. This work offers new insights into the rational design of high-performance polymers by multifluorination strategy.

Keywords: Multifluorination; Polymer Donor; Solar Cell; Wide Band Gap.

Abstract

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