Multi-Functionally Ferroelectric Polymer Promotes Highly-Efficient Large-Area Organic Solar Cells with Excellent Comprehensive Performance

作     者：Deng, Jiawei Liu, Jiabin Li, Wenhao Geng, Xiaokang Xie, Jiaping Jeong, Sang Young Huang, Bin Zhou, Dan Wu, Feiyan Woo, Han Young Chen, Lie 

作者机构： Nanchang University Nanchang330031 China Department of Materials Science Fudan University Songhu Road Shanghai200438 China School of Metallurgical and Chemical Engineering Jiangxi University of Science and Technology 156 Ke Jia Road Ganzhou341000 China School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin University Tianjin300072 China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University Nanchang330063 China Department of Chemistry College of Science Korea University 145 Anam-ro Seongbuk-gu Seoul02841 Korea Republic of 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Tensile strain 

摘      要：Developing high-performance active layer with excellent comprehensive performance is very crucial for the commercialization of organic solar cells (OSCs). Here, we demonstrate the multi-function of ferroelectric polymer polyvinylidene fluoride (PVDF) in improving the device comprehensive performance including device efficiency, stability, green-solvent large-area printing and mechanical property. Addition of PVDF not only enhances the build-in field to promote charge kinetics, but also develops robust network through strong interaction and chain entanglement between polymer donor and PVDF. Importantly, such robust network effectively protects the active layer from excessive flushing/swelling between D/A component to optimize layer-by-layer (LBL) deposition, induce a favorable vertical phase distribution and prolong the film-forming process, consequently facilitating green-solvent blade-coating printing, improving device efficiency and stability, and enhancing device mechanical flexibility. Due to the multiple advantages of PVDF, the PM6/BTP-eC9 obtains an excellent efficiency of 18.35% for BTP-eC9-based LBL devices. By blade-coating printing with green solvent, one of the highest efficiencies of 16.40% is achieved for large-area (1.21 cm2) binary device. Particularly, toughness is used to comprehensively evaluate mechanical property of OSCs, showing significant improvement with simultaneously enhanced fracture strength and tensile strain, and enabling small molecule-based system even have comparable mechanical flexibility and comprehensive performance to the all-polymer system. © 2023, The Authors. All rights reserved.