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Asymmetric Fluorinated Cyclopenta[2,1-b:3,4-b']Dithiophene-Based Hole-Transporting Materials for Perovskite Solar
Kun-Mu Lee1,2,3,4, Jui-Ting Pan5, Wen-Tzu Chen5
1Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 33302, Taiwan.
Chemistry, an Asian Journal
|June 17, 2025
Summary
New asymmetric hole-transporting materials (HTMs) with fluorine atoms boost perovskite solar cell efficiency. These novel HTMs offer improved stability and performance, outperforming existing benchmarks for efficient solar energy conversion.
Area of Science:
- Materials Science
- Renewable Energy
- Organic Electronics
Background:
- Perovskite solar cells (PSCs) are a promising photovoltaic technology.
- Efficient hole-transporting materials (HTMs) are crucial for PSC performance and stability.
- Developing novel, high-performance HTMs is essential for advancing PSC technology.
Purpose of the Study:
- To design, synthesize, and evaluate novel asymmetric hole-transporting materials (HTMs) for perovskite solar cells (PSCs).
- To investigate the impact of fluorine incorporation and molecular asymmetry on HTM properties and PSC performance.
- To compare the performance and stability of novel HTMs against non-fluorinated counterparts and benchmark materials.
Main Methods:
- Synthesis of asymmetric cyclopenta[2,1-b;3,4-b']dithiophene-based HTMs with p-methoxytriphenylamine units.
- Comprehensive characterization including spectroscopy, electrochemistry, DFT calculations, and microscopy (SEM, AFM).
- Fabrication and testing of PSCs using the synthesized HTMs, evaluating photovoltaic parameters, hysteresis, and operational stability.
Main Results:
- Fluorinated HTMs (P-oF, P-mF) exhibited enhanced hole mobility and charge extraction compared to non-fluorinated P-H.
- PSCs with P-oF and P-mF achieved high power conversion efficiencies (PCEs) of 21.52% and 19.78%, respectively, with low hysteresis.
- The novel HTMs demonstrated superior operational stability compared to the benchmark spiro-OMeTAD, indicating their potential for long-term device performance.
Conclusions:
- Asymmetric HTMs, particularly those incorporating fluorine, are effective alternatives for enhancing PSC performance.
- The designed HTMs offer a facile synthetic route and demonstrate significant potential for efficient and stable perovskite solar energy conversion.
- These findings provide valuable insights for the rational design of next-generation HTMs for advanced photovoltaic applications.
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