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Precise End-Group Conjugated-Site Isomerization of Wing-Typed Dimeric Acceptors Enables 20.32% Efficiency Organic
Long Jiang1,2, Jia'nan Hu3,4, Kai Xiang3,5
1State Key Laboratory of Oil and Gas Equipment, CNPC Tubular Goods Research Institute, Xi'an, China.
Molecular isomerization of dimeric acceptors enhances organic solar cell (OSC) performance. Precisely controlling conjugated sites in dimeric acceptors, like Dimer-2, significantly boosts power conversion efficiency (PCE) in OSCs.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Molecular isomerization is key for optimizing photovoltaic materials and organic solar cell (OSC) power conversion efficiency (PCE).
- The impact of precise isomerization in dimeric acceptors on optoelectronic and photovoltaic properties remains underexplored.
Purpose of the Study:
- To investigate how different conjugated sites in end-groups of wing-typed dimeric acceptors influence molecular packing and optoelectronic properties.
- To develop high-performance dimeric acceptors for efficient OSCs.
Main Methods:
- Synthesis of four isomeric wing-typed dimeric acceptors with varying end-group conjugations (EG1 and EG2).
- Characterization of molecular packing, crystallinity, and photoluminescence properties.
- Fabrication and testing of single-junction and ternary organic solar cells.
Main Results:
- Dimer-2, featuring specific EG1 and EG2 arrangements, exhibited superior molecular packing, crystallinity, and photoluminescence.
- PM6:Dimer-2 based OSCs achieved a 15.12% PCE with enhanced photovoltage and fill factor due to optimized morphology and reduced energy loss.
- Ternary OSCs incorporating Dimer-2 reached PCEs of 20.06% and 20.32%, with the latter being the highest reported for ternary OSCs using non-fully conjugated dimeric acceptors.
Conclusions:
- Precise isomerization of end-group conjugated sites is a viable strategy for designing high-performance dimeric acceptors.
- Optimized dimeric acceptors can significantly improve the efficiency and performance of organic solar cells.
- This research provides a pathway for developing next-generation efficient organic photovoltaic devices.
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