Quinoxaline Terpolymer‐Controlled Miscibility With Oligomeric Acceptors for Over 20% Efficiency, Highly Stable and Stretchable Polymer Solar Cells
Abstract
ABSTRACT While the emergence of oligomeric acceptors has improved the operational stability of polymer solar cells (PSCs), power conversion efficiencies (PCEs) and mechanical properties remain morphology‐limited, necessitating tailored polymer donors. Using tethered dimeric acceptor (DY2) as a model acceptor, we demonstrate how strategic modification of the classical D18 donor enhances miscibility and thus device performance. Specially, we developed a new quinoxaline (TQx) building block and incorporated it into D18 via random copolymerization, producing D18‐TQxn terpolymers (n = 5, 10, 15) with 5%–15% TQx proportion. The polar moieties in TQx enhance the surface energy of the terpolymers (improving thermodynamic miscibility) while also modulating the backbone conformation of D18, thereby tuning the crystallization kinetics. The optimal D18‐TQx10 exhibits optimized miscibility with DY2, achieving a remarkable PCE of 20.21%, among the highest reported for binary oligomeric acceptor based devices. Furthermore, the D18‐TQx10 blend exhibits significantly enhanced stretchability, with a crack‐onset strain nearly three times greater than that of the pristine D18‐based device. It also demonstrates good compatibility with a range of dimeric acceptors. This work establishes a dual‐control strategy using a quinoxaline terpolymer to regulate thermodynamic miscibility and crystallization kinetics, addressing the key challenges of morphology control for high performance PSCs using oligomeric acceptors.
Article Details
Authors (18)
Hongru Chen
Haomiao Zhang
Yang Bai
Yutong Zhang
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences
Yiling Hu
Ying Chen
Yi Lu
Sangjin Yang
Department of Energy Engineering, School of Energy and Chemical Engineering
Jiongjiong Zhang
State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing China
Jiangang Liu
Lingwei Xue
School of Chemical and Environmental Engineering, Pingdingshan University 3 , Pingdingshan, Henan 467000,
Wancheng Yu
National Synchrotron Radiation Laboratory, State Key Laboratory of Advanced Glass Materials, Anhui Provincial Engineering Research Center for Advanced Functional Polymer Films, University of Science and Technology of China 1 , Hefei, Anhui 230029,
Pei Cheng
Xiuyu Wang
Institute of Process Equipment, College of Energy Engineering
Liwei Mi
School of Chemical and Environmental Engineering Pingdingshan University Pingdingshan Henan China
Shun Duan
State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology), Ministry of Education, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, No. 15 Beisanhuan East Road, Beijing 100029, China
Changduk Yang
Department of Energy Engineering, School of Energy and Chemical Engineering
Zhi‐Guo Zhang
Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing China