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Benzo[1,2-b:4,5-b']diselenophene-fused nonfullerene acceptors with alternative aromatic ring-based and monochlorinated end group: new synergistic strategy to simultaneously achieve highly efficient organic solar cells with energy loss of 0.49 eV

Abstract

A new synergistic strategy using electron-rich core units and altering the aromatic structure-based 1,1-dicyanomethylene-3-indanone (IC) as end-groups for nonfullerene PSCs is reported and investigated how to obtain excellent PCE with extreme low Eloss simultaneously. Specifically, two Benzo[1,2-b:4,5-b']diselenophene-based, A-D-A-type chlorinated NF-SMAs (BDSeThCl and BDSePhCl) are synthesized, which are linked with a new 2-chlorothienyl-based IC and a conventional monochlorinated phenyl-based IC as end-group, respectively. BDSePhCl exhibited a wider and red-shifted absorption and downshifted energy levels than that of BDSeThCl. The blend films of BDSePhCl:PM7 perform better charge generation properties, more suitable phase separation, and more balanced charge mobilities in comparison with that of BDSeThCl:PM7. Therefore, compared to the best PCE of 11.91% with Eloss of 0.58 eV for BDSeThCl:PM7 blends, the optimal BDSePhCl:PM7 blends show an enhanced PCE of 13.68% with reducing Eloss of 0.49 eV. Notably, the excellent PCE of 13.68% is the highest record for A-D-A-type NF-SMAs with monochlorinated IC group in binary PSCs. The Eloss of 0.49 eV is the lowest value reported for A-D-A typed NF-SMAs in binary PSCs with PCE >13%. These results demonstrate that tailoring the monochlorinated aromatic ring-based IC is an effective strategy to improve the PCE and reduce the Eloss simultaneously in binary PSCs.

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Publication details

The article was received on 25 Mar 2019, accepted on 16 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA03177D
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Benzo[1,2-b:4,5-b']diselenophene-fused nonfullerene acceptors with alternative aromatic ring-based and monochlorinated end group: new synergistic strategy to simultaneously achieve highly efficient organic solar cells with energy loss of 0.49 eV

    J. Wang, S. Wan, X. Xu, G. Yuan, Z. Jiang, G. Ge, H. Bai, Z. Li and Q. Peng, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03177D

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