Dual‐Channel Förster Resonance Energy Transfer Boosting Exciton Utilization Efficiency for High‐Performance Layer‐by‐Layer Processed All‐Small‐Molecule Organic Solar Cells
Abstract
Abstract All‐small‐molecule organic solar cells (ASM‐OSCs) hold great potential for commercialization owing to their well‐defined molecular structures and minimal batch‐to‐batch variations. Nevertheless, the inherent challenges in precise control of blend morphology of the active layer restrict exciton utilization efficiency, resulting in the restricted power conversion efficiencies (PCEs) in ASM‐OSC compared with polymer‐based OSCs. Herein, small molecule donor Por‐BR is incorporated into the acceptor layer of the DAPor‐DPP/6TIC system utilizing a layer‐by‐layer (LbL) deposition strategy to construct high‐performance ASM‐OSCs. The LbL deposition strategy facilitates the formation of a more pronounced vertical phase distribution in the active layer. Besides, dual‐channel FRET from Por‐BR to both DAPor‐DPP and 6TIC occurs in the active layer. Benefiting from the combined advantages of the LbL deposition strategy and dual‐channel FRET, a broader spatial distribution of exciton generation sites is achieved, accompanied by significantly improved exciton utilization efficiency, enhanced carrier mobility, and reduced charge recombination. The optimal device delivers a remarkable PCE of 17.76%, representing one of the highest PCE values reported so far in ASM‐OSCs. This work offers an effective strategy for device performance enhancement, which in turn facilitates the industrialization of OSCs.
Article Details
Authors (13)
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
Yanna Sun
Meiyuan Zu
Qingdao Innovation and Development Center Harbin Engineering 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
Wenqing Zhang
Academy for Advanced Interdisciplinary Studies & Department of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Computational Science and Material Design
Chuanlin Gao
College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 P. R. China
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
Hua Xie
State Key Laboratory of Chemical Reaction Dynamics
Xianshao Zou
Qingdao Innovation and Development Center, Harbin Engineering University 4 , Qingdao 266000,
Guangye Zhang
Renqiang Yang
Xiaotao Hao
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