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Ionic Liquid-Induced Ostwald Ripening Effect for Efficient and Stable Tin-Based Perovskite Solar Cells
Zhuojia Lin1,2, Yang Su1,2, Runying Dai3
1College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
ACS Applied Materials & Interfaces
|March 24, 2021
Summary
High-quality tin-based perovskite films were achieved using 1-butyl-3-methylimidazolium bromide (BMIBr) ionic liquids, enhancing photovoltaic performance and stability in lead-free solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Tin-based perovskite solar cells (PVSCs) are promising lead-free alternatives.
- Rapid crystallization of tin-based perovskites leads to poor film morphology and defects, limiting performance.
Purpose of the Study:
- To improve the film quality and photovoltaic performance of tin-based PVSCs.
- To investigate the use of 1-butyl-3-methylimidazolium bromide (BMIBr) ionic liquids for enhanced perovskite formation.
Main Methods:
- Employing BMIBr ionic liquids to induce Ostwald ripening for larger grain sizes.
- Reducing non-radiative recombination by treating perovskite films with BMIBr.
Main Results:
- Achieved a photoelectric conversion efficiency (PCE) of 10.09% in inverted tin-based PVSCs.
- BMIBr-treated devices maintained 85% of initial PCE after 1200 hours in N2.
- Devices retained approximately 40% of PCE after 48 hours in air.
Conclusions:
- BMIBr ionic liquids effectively promote Ostwald ripening, yielding high-quality tin-based perovskite films.
- BMIBr treatment significantly enhances the photovoltaic performance and stability of tin-based PVSCs.
- This approach offers a viable pathway for developing efficient and stable lead-free perovskite solar cells.
