Precise Control Over Crystallization Kinetics by Combining Nucleating Agents and Plasticizers for 20.1% Efficiency Organic Solar Cells
Abstract
Abstract Obtaining controllable active layer morphology plays a significant role in boosting the device performance of organic solar cells (OSCs). Herein, a quaternary strategy, which incorporates polymer donor D18‐Cl and small molecule acceptor AITC into the host D18:N3, is employed to precisely modulate crystallization kinetics for favorable morphology evolution within the active layer. In situ spectroscopic measurements during film‐formation demonstrate that while D18‐Cl works as a nucleator to promote aggregation of D18 and foster donor/acceptor intermixing, AITC has exactly the opposite impact on aggregation of N3 and intermixing kinetics of donor and acceptor, working as a plasticizer. The mutually compensational effect of the dual‐guests, as a result, enables synergistic control over fibrillar networks, multi‐length scale morphology, and vertical phase distribution, leading to optimized 3D morphology for greatly enhanced exciton dissociation and charge transfer, suppressed charge recombination, and reduced energy loss. Consequently, the quaternary OSCs based on D18:D18‐Cl:N3:AITC achieved an excellent power conversion efficiency of 20.1%, which represents one of the highest efficiencies for single‐junction OSCs. This work presents an effective strategy to precisely regulate crystallization kinetics toward advanced morphology control for high‐performance OSCs.
Article Details
Authors (18)
Bo Cheng
Xinxin Xia
Sixuan Cheng
National Engineering Research Center for Colloidal Materials Key Laboratory of Special Functional Aggregated Materials (Shandong University) Ministry of Education School of Chemistry & Chemical Engineering Shandong University Jinan 250100 China
Chenyu Han
State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao China
Fengbo Sun
Zhen Fu
School of Physics, State Key Laboratory of Crystal Materials
Wenwen Hou
Feng Hua
National Engineering Research Center for Colloidal Materials Key Laboratory of Special Functional Aggregated Materials (Shandong University) Ministry of Education School of Chemistry & Chemical Engineering Shandong University Jinan Shandong 250100 China
Hao Wang
Division of Quantitative Sciences, Department of Oncology Johns Hopkins University School of Medicine Baltimore Maryland USA
Wei Sun
Yumiao Huo
National Engineering Research Center for Colloidal Materials Key Laboratory of Special Functional Aggregated Materials (Shandong University) Ministry of Education School of Chemistry & Chemical Engineering Shandong University Jinan Shandong China
Shengqi Ji
National Engineering Research Center for Colloidal Materials Key Laboratory of Special Functional Aggregated Materials (Shandong University) Ministry of Education School of Chemistry & Chemical Engineering Shandong University Jinan 250100 China
Xia Guo
Shenzhen Campus of Sun Yat-sen University
Hang Yin
Xiaoyan Du
Xiaotao Hao
Yongfang Li
Maojie Zhang