Asymmetric chlorination of A2–A1–D–A1–A2 type non-fullerene acceptors for high-voltage organic photovoltaics

Herein, we synthesized an asymmetric A2–A1–D–A1–A2 type small molecule nonfullerene acceptor (NFA), HCl-BTA3, by chlorination on one side of A1. The synergistic effect of the asymmetric structure and chlorination endows HCl-BTA3 with a large dipole moment, close molecular packing, and high-efficienc...

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Bibliographic Details
Published inChemical communications (Cambridge, England) Vol. 58; no. 96; pp. 13373 - 13376
Main Authors Cong, Peiqing, Li, Xianda, Tang, Ailing, Wu, Jiang, Chen, Jianhua, Chen, Lie, Zhou, Erjun
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.12.2022
Subjects
Asymmetric structures
Charge efficiency
Charge transfer
Chlorination
Dipole moments
Energy conversion efficiency
High voltages
Open circuit voltage
Photovoltaic cells
Synergistic effect
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Summary:Herein, we synthesized an asymmetric A2–A1–D–A1–A2 type small molecule nonfullerene acceptor (NFA), HCl-BTA3, by chlorination on one side of A1. The synergistic effect of the asymmetric structure and chlorination endows HCl-BTA3 with a large dipole moment, close molecular packing, and high-efficiency charge transfer and transport. After being blended with a carboxylate-based polymer donor, TTC-Cl, HCl-BTA3 achieved a high open-circuit voltage (VOC) of 1.20 V and a satisfactory power conversion efficiency (PCE) of 11.2%, which are among the highest values for high-voltage carboxylate-based polymers.
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ISSN:1359-7345
1364-548X
DOI:10.1039/d2cc05631c