Halogenated Dibenzo[ f , h ]quinoxaline Units Constructed 2D‐Conjugated Guest Acceptors for 19% Efficiency Organic Solar Cells

Gao, Jingshun; Bai, Hairui; Li, Ping; Zhou, Yibo; Su, Wenyan; Liu, Chang; Li, Xiaoxiao; Wu, Yue; Hu, Bin; Liang, Zezhou; Bi, Zhaozhao; Li, Xiong; Yan, Lihe; Du, Huiling; Lu, Guanghao; Gao, Chao; Wang, Kun; Liu, Yuhang; Ma, Wei; Fan, Qunping

doi:10.1002/advs.202403334

Halogenated Dibenzo[ f , h ]quinoxaline Units Constructed 2D‐Conjugated Guest Acceptors for 19% Efficiency Organic Solar Cells

Journal Article · Mon Jun 17 00:00:00 EDT 2024 · Advanced Science

DOI:https://doi.org/10.1002/advs.202403334· OSTI ID:2373261

Gao, Jingshun ^[1]; Bai, Hairui ^[2]; Li, Ping ^[2]; Zhou, Yibo ^[3]; Su, Wenyan ^[4]; Liu, Chang ^[2]; Li, Xiaoxiao ^[5]; Wu, Yue ^[5]; Hu, Bin ^[6]; Liang, Zezhou ^[7]; Bi, Zhaozhao ^[2]; Li, Xiong ^[8]; Yan, Lihe ^[7]; Du, Huiling ^[4]; Lu, Guanghao ^[6]; Gao, Chao ^[9]; Wang, Kun ^[10]; Liu, Yuhang ^[2]; Ma, Wei ^[2]; ^[2]

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China, School of Materials and Chemical Engineering Zhongyuan University of Technology Zhengzhou 451191 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China, School of Materials Science and Engineering Xi'an University of Science and Technology Xi'an 710054 China
School of Materials Science and Engineering Xi'an University of Science and Technology Xi'an 710054 China
Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor‐Optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China
Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 710054 China
Key Laboratory for Physical Electronics and Devices of the Ministry of Education &, Shaanxi Key Lab of Photonic Technique for Information School of Electronics Science &, Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China
Department of Physics Beijing Technology and Business University Beijing 100048 China
Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials State Key Laboratory of Fluorine &, Nitrogen Chemicals Xi'an Modern Chemistry Research Institute Xi'an 710065 China
School of Materials and Chemical Engineering Zhongyuan University of Technology Zhengzhou 451191 China

Abstract

Halogenation of Y‐series small‐molecule acceptors (Y‐SMAs) is identified as an effective strategy to optimize photoelectric properties for achieving improved power‐conversion‐efficiencies (PCEs) in binary organic solar cells (OSCs). However, the effect of different halogenation in the 2D‐structured large π‐fused core of guest Y‐SMAs on ternary OSCs has not yet been systematically studied. Herein, four 2D‐conjugated Y‐SMAs (X‐QTP‐4F, including halogen‐free H‐QTP‐4F, chlorinated Cl‐QTP‐4F, brominated Br‐QTP‐4F, and iodinated I‐QTP‐4F) by attaching different halogens into 2D‐conjugation extended dibenzo[ f , h ]quinoxaline core are developed. Among these X‐QTP‐4F, Cl‐QTP‐4F has a higher absorption coefficient, optimized molecular crystallinity and packing, suitable cascade energy levels, and complementary absorption with PM6:L8‐BO host. Moreover, among ternary PM6:L8‐BO:X‐QTP‐4F blends, PM6:L8‐BO:Cl‐QTP‐4F obtains a more uniform and size‐suitable fibrillary network morphology, improved molecular crystallinity and packing, as well as optimized vertical phase distribution, thus boosting charge generation, transport, extraction, and suppressing energy loss of OSCs. Consequently, the PM6:L8‐BO:Cl‐QTP‐4F‐based OSCs achieve a 19.0% efficiency, which is among the state‐of‐the‐art OSCs based on 2D‐conjugated Y‐SMAs and superior to these devices based on PM6:L8‐BO host (17.70%) and with guests of H‐QTP‐4F (18.23%), Br‐QTP‐4F (18.39%), and I‐QTP‐4F (17.62%). The work indicates that halogenation in 2D‐structured dibenzo[ f , h ]quinoxaline core of Y‐SMAs guests is a promising strategy to gain efficient ternary OSCs.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2373261

Alternate ID(s):: OSTI ID: 2434077
OSTI ID: 2471022

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 31 Vol. 11; ISSN 2198-3844

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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