Precise Structure Regulation Induced Morphological Ordering Enables All‐Polymer Solar Cells With 20.29% Efficiency and Extreme Mechanical Robustness
Abstract
ABSTRACT All polymer organic solar cells (APSCs) demonstrate distinctive advantages in balancing device efficiency while enhancing operational stability, particularly regarding mechanical robustness. However, their power conversion efficiency (PCE) has long been behind that of the corresponding devices with small molecular acceptors. This is due to the precise chemical structure modulation of polymer acceptors (PAs), enabling relatively coplanar conformation and ordered molecular stacking and thus achieving ideal morphology, which remains critically challenging. Herein, in this work, we have designed two biaxial conjugate extension PAs, with various side chain/terminal substituents to control their intermolecular non‐covalent interactions, thereby optimizing aggregation behavior and microstructural orientation of polymer assemblies. It was found that the alkoxy‐functionalized PQxO‐IT facilitates stronger intermolecular interactions and tighter π‐π stacking. Furthermore, the PQx‐FT:PQxO‐IT composite promoted charge carrier mobility and charge transport, while effectively suppressing non‐radiative decay pathways. Consequently, the corresponding ternary device achieved the highest PCE of 20.29% (certified as 20.03%) for the APSC systems so far. Furthermore, the tight and ordered molecular packing endowed the flexible device with a PCE of 18.93% and remarkable durability during continuous bending tests. This study demonstrates a precise structure modulation strategy that offers a viable materials design pathway for high‐performance flexible photovoltaics.
Article Details
Authors (14)
Huanhuan Gao
Lingya Sun
Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao China
Yanna Sun
Lei Wang
Xiao Ma
State Key Laboratory of Solidification Processing
Meiyuan Zu
Qingdao Innovation and Development Center Harbin Engineering University Qingdao China
Xianshao Zou
Qingdao Innovation and Development Center, Harbin Engineering University 4 , Qingdao 266000,
Yuanyuan Kan
Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao China
Xunchang Wang
Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials & Technology Jianghan University Wuhan China
Renqiang Yang
Xiangjian Wan
State Key Laboratory and Institute of Elemento-Organic Chemistry, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), Frontiers Science Center for New Organic Matter, College of Chemistry
Yiyu Feng
School of Materials Science and Engineering Shandong Key Laboratory of Functional‐Structural Integrated Ceramics Discipline and Technology Center for High Temperature Functional Ceramics Shandong University of Technology Zibo China
Ke Gao
State Key Laboratory of Bioactive Substance and Function of Natural Medicines, CAMS Key Laboratory of Enzyme and Biocatalysis of Natural Drugs, and NHC Key Laboratory of Biosynthesis of Natural Products
Yongsheng Chen
Department of Neurosurgery The Tenth Affiliated Hospital Southern Medical University Dongguan China