Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High-Performance
Fuliang Cheng1, Yongjie Cui1,2, Feng Ding1
1National 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.
Novel terpolymers using chlorine regioisomerization enhance organic solar cell performance. This strategy improves molecular structure and film properties, leading to a record 18.37% power conversion efficiency in organic solar cells.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Improving organic solar cell (OSC) performance is challenging.
- Novel polymer donors are needed to overcome current limitations.
- Terpolymerization and regioisomerization offer potential solutions.
Purpose of the Study:
- To develop novel polymer donors by combining terpolymerization and regioisomerization.
- To investigate the effect of chlorine substituent positions on polymer properties and OSC performance.
- To achieve high power conversion efficiency in organic solar cells.
Main Methods:
- Synthesis of two isomeric units: TTO and TTI.
- Random copolymerization of these units into the PM6 backbone to form terpolymers.
- Characterization of terpolymer properties (planarity, ESP, aggregation, miscibility) and OSC device performance.
Main Results:
- Chlorine substituent position significantly impacts molecular planarity and electrostatic potential (ESP).
- The TTO unit leads to better coplanarity, crystallinity, aggregation, and phase separation compared to TTI.
- PM6-TTO-10 based OSCs achieved a champion power conversion efficiency of 18.37% with a 79.97% fill factor.
Conclusions:
- Combining terpolymerization and chlorine regioisomerization is an effective strategy for high-performance polymer donors.
- Optimized molecular design through regioselective chlorine substitution enhances OSC efficiency.
- This approach offers a promising pathway for advancing organic solar cell technology.
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