有机太阳能电池
混溶性
结晶度
聚合物
材料科学
富勒烯
聚合物太阳能电池
带隙
化学工程
纳米技术
光电子学
化学
有机化学
复合材料
工程类
作者
Jin‐Ming Chen,Dongyan Li,Mingbin Su,Yonghong Xiao,Hui Chen,Man Lin,Xiaolan Qiao,Li Dang,Xiao‐Chun Huang,Feng He,Qinghe Wu
标识
DOI:10.1002/anie.202215930
摘要
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.
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