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Cheng F, Cui Y, Ding F, Chen Z, Xie Q, Xia X, Zhu P, Lu X, Zhu H, Liao X, Chen Y. Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High-Performance Organic Solar Cells. Adv Mater 2023:e2300820. [PMID: 37073407 DOI: 10.1002/adma.202300820] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/11/2023] [Indexed: 05/03/2023]
Abstract
For the first time, we combined terpolymerization and regioisomerization strategies to develop novel polymer donors to overcome the difficulty of improving organic solar cells (OSCs) performance. Two novel isomeric units, TTO and TTI, were obtained and incorporated into the PM6 backbone via random copolymerization to form a series of terpolymers. Interestingly, we found that different chlorine (Cl) substituent positions can significantly change the molecular planarity and electrostatic potential (ESP) owing to the steric hindrance effect of the heavy Cl atom, which leads to different molecular aggregation behaviors and miscibility between the donor and acceptor. The TTO unit features a higher number of multiple S⋅⋅⋅O non-covalent interactions, more positive ESP, and fewer isomer structures than TTI. As a result, the terpolymer PM6-TTO-10 exhibited a much better molecular coplanarity, stronger crystallinity, more obvious aggregation behavior, and proper phase separation in the blend film, which are conducive to more efficient exciton dissociation and charge transfer. Consequently, the PM6-TTO-10:BTP-eC9-based OSCs achieved a champion power conversion efficiency (PCE) of 18.37% with an outstanding fill factor of 79.97%, which are among the highest values reported for terpolymer-based OSCs. This work demonstrates that terpolymerization combined with Cl regioisomerization is an efficient approach for achieving high-performance polymer donors. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Fuliang Cheng
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
| | - Yongjie Cui
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China
| | - Feng Ding
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
| | - Zeng Chen
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Qian Xie
- Institute of Applied Chemistry, Jiangxi Academy of Sciences, Nanchang, 330096, China
| | - Xinxin Xia
- Department of Physics, Chinese University of Hong Kong New Territories, Hong Kong, 999077, China
| | - Peipei Zhu
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
| | - Xinhui Lu
- Department of Physics, Chinese University of Hong Kong New Territories, Hong Kong, 999077, China
| | - Haiming Zhu
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Xunfan Liao
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
| | - Yiwang Chen
- National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University 99 Ziyang Avenue, Nanchang, 330022, China
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