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Issue 19, 2019
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Benzo[1,2-b:4,5-b′]diselenophene-fused nonfullerene acceptors with alternative aromatic ring-based and monochlorinated end groups: a new synergistic strategy to simultaneously achieve highly efficient organic solar cells with the energy loss of 0.49 eV

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Abstract

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

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

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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
J. Mater. Chem. A, 2019,7, 11802-11813

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

    S. Wan, X. Xu, J. Wang, G. Yuan, Z. Jiang, G. Ge, H. Bai, Z. Li and Q. Peng, J. Mater. Chem. A, 2019, 7, 11802
    DOI: 10.1039/C9TA03177D

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