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Research Article

A new nonfullerene acceptor with an extended π conjugation core enables ternary organic solar cells approaching 19% efficiency

Chunyan Liu1, Nailiang Qiu2( ), Zhengjin Li2, Yan Lu1( )
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China
School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu 273155, China
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Graphical Abstract

A new guest acceptor named TBF-2Cl exhibits a high lowest unoccupied molecular orbital (LUMO) level benefiting from the extended conjugated core. When blended with the host materials D18 and CH-6F, a remarkable power conversion efficiency of 18.92% was achieved for the optimal ternary device.

Abstract

In organic solar cells (OSCs), it is an effective way to improve the power conversion efficiency (PCE) by adding a guest component with appropriate absorption and energy levels in the host system. Herein, a new nonfullerene acceptor (NFA) named TBF-2Cl was developed by the strategy of expanding the π conjugated core of 2,2’-(((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b’]dithiophene-2,7-diyl)bis(methaneylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDT-4Cl) with two benzene rings. With increase of benzene units, TBF-2Cl exhibits higher lowest unoccupied molecular orbital (LUMO) level of −3.75 eV than that of one benzene unit based NFA IDT-4Cl and fluorene core based NFA F-2Cl, which facilitates enhancing the open-circuit voltage (Voc) of ternary devices. Moreover, TBF-2Cl film shows a medium optical bandgap with the absorption range from 500–800 nm, being well complementary with the wide bandgap polymer donor D18 and narrow bandgap NFA CH-6F. Accordingly, a remarkable PCE of 18.92% with a high short-circuit current density (Jsc) of 27.40 mA·cm−2, a fill factor (FF) of 0.749, especially an outstanding Voc of 0.922 V was achieved for the optimal ternary device based on D18:TBF-2Cl:CH-6F, surpassing the binary counterpart (17.08%). The findings provide insight into the development of new guest acceptors for obtaining more efficient OSCs.

Keywords

medium optical bandgaphigh lowest unoccupied molecular orbital (LUMO) levelthe third componentternary organic solar cellhigh open-circuit voltage

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4062-4068
DOI: 10.1007/s12274-023-6293-7
Cite this article:
Liu C, Qiu N, Li Z, et al. A new nonfullerene acceptor with an extended π conjugation core enables ternary organic solar cells approaching 19% efficiency. Nano Research, 2024, 17(5): 4062-4068. https://doi.org/10.1007/s12274-023-6293-7
Topics:
Organic solar cells

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Received: 02 October 2023
Revised: 26 October 2023
Accepted: 27 October 2023
Published: 04 December 2023
© Tsinghua University Press 2023
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