journal article·2025-07Open access

Asymmetric Acceptors with Benzotriazine Central Core Achieving 19.63% Efficiency in Organic Solar Cells

Qiansai Han, Wendi Shi, Wenkai Zhao, Tengfei He, Ruohan Wang, Guankui Long, Zhaoyang Yao, Bin Kan, Yan Lu, Xiangjian Wan, Chenxi Li, Yongsheng Chen

Advanced Optical Materials· Volume 13· Issue 19

Abstract

Abstract Decreasing the symmetry of acceptors can enhance the molecular dipole moment, influence intermolecular packing and has been proven to be an efficient strategy to improve device performance. This study presents a new asymmetric design strategy to develop acceptors beyond conventional end group or side chain engineering. Specifically, an asymmetric unit, 1,2,4‐benzotriazine, is introduced as the central core in Y‐series acceptors. Additionally, monophenyl with and without fluorine, are substituted on the asymmetric core. This combination yields two asymmetric acceptors, H‐1 and H‐2F, both of which exhibit large dipole moments and strong packing interactions. Consequently, organic solar cells (OSCs) based on D18:H‐1 and D18:H‐2F achieved a high power conversion efficiencies (PCEs) of 18.56% and 18.85%, respectively. By incorporating BO‐4Cl into the D18:H‐2F blend, the ternary device achieved a remarkable efficiency of 19.63% due to the extended absorption and improved morphology. This work establishes a new asymmetric and easily modifiable central unit, highlights the advantages of asymmetric acceptors, and demonstrates their potential in OSCs.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Elemento‐Organic Chemistry, Frontiers Science Center for New Organic Matter, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, Renewable Energy Conversion and Storage Center (RECAST), Tianjin Key Laboratory of functional polymer materials Nankai University Tianjin 300071 China

School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST) Nankai University Tianjin 300350 China

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

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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