Affiliation:
1. School of Materials Science and Engineering National Institute for Advanced Materials Nankai University 300350 Tianjin China
2. State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic Matter The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University 300071 Tianjin China
3. Chongqing Institute of Green and Intelligent Technology Chongqing School University of Chinese Academy of Sciences (UCAS Chongqing) Chinese Academy of Sciences 400714 Chongqing China
4. Hubei Key Laboratory on Organic and Polymeric Opto-electronic Materials College of Chemistry and Molecular Sciences Wuhan University 430072 Wuhan China
5. Institute of Science and Technology Xi'an Jiaotong University 710054 Xi'an China
Abstract
AbstractMorphological control of all‐polymer blends is quintessential yet challenging in fabricating high‐performance organic solar cells. Recently, solid additives (SAs) have been approved to be capable in tuning the morphology of polymer: small‐molecule blends improving the performance and stability of devices. Herein, three perhalogenated thiophenes, which are 3,4‐dibromo‐2,5‐diiodothiophene (SA‐T1), 2,5‐dibromo‐3,4‐diiodothiophene (SA‐T2), and 2,3‐dibromo‐4,5‐diiodothiophene (SA‐T3), were adopted as SAs to optimize the performance of all‐polymer organic solar cells (APSCs). For the blend of PM6 and PY‐IT, benefitting from the intermolecular interactions between perhalogenated thiophenes and polymers, the molecular packing properties could be finely regulated after introducing these SAs. In situ UV/Vis measurement revealed that these SAs could assist morphological character evolution in the all‐polymer blend, leading to their optimal morphologies. Compared to the as‐cast device of PM6 : PY‐IT, all SA‐treated binary devices displayed enhanced power conversion efficiencies of 17.4–18.3 % with obviously elevated short‐circuit current densities and fill factors. To our knowledge, the PCE of 18.3 % for SA‐T1‐treated binary ranks the highest among all binary APSCs to date. Meanwhile, the universality of SA‐T1 in other all‐polymer blends is demonstrated with unanimously improved device performance. This work provide a new pathway in realizing high‐performance APSCs.
Funder
Ministry of Science and Technology of the People's Republic of China
National Natural Science Foundation of China
Natural Science Foundation of Chongqing Municipality
Subject
General Chemistry,Catalysis