Platinum‐Complex Acceptor Modulating Dielectric Constant and Exciton‐Vibration Coupling for High‐Efficiency Organic Solar Cells with Suppressed Energy Loss
Abstract
Abstract Excessive energy loss ( E loss ) remains a primary bottleneck limiting further efficiency improvements in organic solar cells (OSCs). Mitigating energy losses is therefore a key prerequisite for advancing organic photovoltaic technologies. Rational acceptor molecular design that modulates the dielectric constant and exciton‐vibration coupling of the active layer has emerged as a particularly promising route to achieving this goal. Herein, a platinum‐complex‐based non‐fullerene acceptor (PtHD) is designed and synthesized. The molecule features high planarity and backbone rigidity, which effectively suppresses exciton‐vibration coupling. Integrating the Pt coordination unit amplifies the molecular dipole moment and polarizability, consequently enhancing the dielectric constant of the active layer. A binary device based on D18/PtHD achieves a high open‐circuit voltage of 0.938 V with a reduced E loss of 0.525 eV. Building on this achievement, by introducing PtHD as a guest component into the D18/L8‐BO system and employing a layer‐by‐layer deposition strategy to control the vertical distribution, the ternary device demonstrates an minimized E loss and superior exciton separation, culminating in a remarkably high power conversion efficiency (PCE) of 20.52%. This work highlights the crucial role of metal‐complex acceptors in managing energy loss and charge dynamics, thus providing a molecular design paradigm to develop highly efficient organic photovoltaics.
Article Details
Authors (21)
Huajun Xu
Xinyue Jiang
Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao 266237 P. R. China
Yanna Sun
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
Wentao Zou
Shizhao Liu
Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao 266237 P. R. China
Shengwei Shen
Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao 266237 P. R. China
Tengxiang Gao
School of Physics and Materials Science Guangzhou University Guangzhou China
Chuangcheng Hong
School of Physics and Materials Science Guangzhou University Guang‐zhou 510006 P.R. China
Xunchang Wang
Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials & Technology Jianghan University Wuhan China
Chuanlin Gao
College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 P. R. China
Dongcheng Jiang
Jianan Zheng
Xianshao Zou
Qingdao Innovation and Development Center, Harbin Engineering University 4 , Qingdao 266000,
Wei Zhang
Guangye Zhang
Hang Yin
Renqiang Yang
Deyu Liu
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
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