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Regulating Precursor Viscosity with Inert Solvent Additives for Efficient Blade-Coated Perovskite Solar Cells
Jingjing Wu1,2, Zhaokai Liu1,2, Yongrui Yang1,2
1Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Small Methods
|February 24, 2025
Summary
Ethylene glycol addition improves blade-coated perovskite solar cell quality and efficiency. This method enhances film morphology, achieving a 24.10% power conversion efficiency and excellent operational stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Metal halide perovskite solar cells (PSCs) show promise for next-generation solar energy.
- Blade coating offers scalable manufacturing but faces challenges in perovskite film quality compared to spin coating.
- Limited power conversion efficiency (PCE) in blade-coated PSCs is linked to uncontrolled crystallization.
Purpose of the Study:
- To enhance the quality and performance of perovskite films fabricated using blade coating.
- To address the challenges of crystallization control and film morphology in scalable PSC manufacturing.
- To improve the power conversion efficiency (PCE) and operational stability of blade-coated PSCs.
Main Methods:
- Introduction of ethylene glycol (EG) as an inert co-solvent in perovskite precursor solutions.
- Utilizing EG's high viscosity for controlled deposition of thick perovskite films (400-2000 nm).
- Leveraging EG's low vapor pressure to suppress premature nucleation during film formation.
Main Results:
- Achieved high-quality perovskite films with enhanced morphology via blade coating.
- Demonstrated a champion power conversion efficiency (PCE) of 24.10% for blade-coated PSCs.
- Exhibited significant operational stability, retaining 89% of initial efficiency after 600 hours.
Conclusions:
- Ethylene glycol is an effective additive for improving blade-coated perovskite film quality and device performance.
- The developed method offers a pathway for scalable and efficient manufacturing of perovskite solar cells.
- Enhanced film morphology and controlled crystallization contribute to high PCE and improved device longevity.
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