journal article·2025-02

Halogenation Engineering of Solid Additives Enables 19.39% Efficiency and Stable Binary Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Both Donor and Acceptor Components

Wenyan Su, Xuming Zhou, Qiang Wu, Yue Wu, Hongmei Qin, Zezhou Liang, Hongxiang Li, Hairui Bai, Jing Guo, Long Jiang, Yuhang Liu, Ruijie Ma, Yuxiang Li, Weiguo Zhu, Qunping Fan

Advanced Functional Materials· Volume 35· Issue 6
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Abstract

Abstract By selectively interacting with acceptor components, various typed solid additives achieve boosted power conversion efficiency (PCE) in organic solar cells (OSCs). However, due to the efficient active layer being composed of donor and acceptor materials, it is difficult to obtain the desired morphology by manipulating the acceptor component alone, limiting further improvement of PCEs. Herein, two solid additives with a same backbone of thiophene‐benzene‐thiophene (halogen‐free D1‐H) but different halogen substituents (fluorinated D1‐F and chlorinated D1‐Cl) are developed to probe the working mechanism of halogenated variation of solid additives in OSCs. Unlike D1‐H with continuous charge distributions, D1‐F and D1‐Cl show isolated positive charge distribution in benzene‐core and negative charge distribution in thiophene, offering stronger non‐covalent interactions with both donor (PM6) and acceptor (L8‐BO), especially D1‐Cl. Consequently, D1‐Cl‐treated active layer obtains an optimized phase separation and improved molecular packing, boosting PCE to 18.59% and device stability of OSCs, with 17.62% for D1‐H‐treated counterparts. Moreover, using D18:L8‐BO and D18:BTP‐eC9 as active layers, D1‐Cl‐treated binary OSCs obtain impressive PCEs of 19.29% and 19.39%, respectively. This work indicates that halogenation engineering developed in solid additives can effectively regulate morphology for improving PCE and stability of OSCs, and elucidates the underlying mechanism.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

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

Affiliations

School of Materials Science and Engineering Xi'an University of Science and Technology Xi'an 710054 China

State Key Laboratory of Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 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 215123 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

College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China

State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute Xi'an Shaanxi 710077 China

Department of Electronic and Information Engineering Research Institute for Smart Energy (RISE) The Hong Kong Polytechnic University Kowloon Hong Kong 999077 China

Jiangsu Engineering Research Center of Light‐Electricity‐Heat Energy Converting Materials and Applications School of Materials Science and Engineering Changzhou University Changzhou 213164 China

Funding

National Natural Science Foundation of China · Key Science and Technology Program of Shaanxi Province

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