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Stable and High-Efficiency Methylammonium-Free Perovskite Solar Cells
Xiao-Xin Gao1,2,3, Wen Luo2,4, Yi Zhang2
1School of Chemical Engineering and Technology, Tianjin University, 135 Yaguan Road, Tianjin, 300350, China.
Advanced Materials (Deerfield Beach, Fla.)
|January 28, 2020
Summary
This study developed stable, high-efficiency perovskite solar cells (PSCs) without methylammonium (MA) by incorporating cesium chloride. These MA-free PSCs demonstrate excellent long-term stability and a 20.50% power conversion efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Organic-inorganic metal halide perovskite solar cells (PSCs) show high power conversion efficiency (PCE) but suffer from thermal instability due to methylammonium (MA) cations.
- This instability poses a significant challenge for the long-term operational stability and commercialization of PSCs.
Purpose of the Study:
- To develop a novel method for fabricating highly phase-stable perovskite films without MA cations.
- To enhance the long-term stability and power conversion efficiency (PCE) of perovskite solar cells (PSCs).
Main Methods:
- Introduced cesium chloride (CsCl) into a double cation (cesium, formamidinium) perovskite precursor to create MA-free perovskite films.
- Regulated the bromide (Br-) content to optimize the bandgap and improve PCE.
Main Results:
- Achieved MA-free perovskite solar cells with a power conversion efficiency (PCE) of 20.50%.
- Demonstrated remarkable long-term stability, with unencapsulated devices retaining 80% of their initial efficiency after 1000 hours of aging.
- The fabricated perovskite films exhibited high phase stability.
Conclusions:
- The developed method successfully enhances both the stability and performance of perovskite solar cells simultaneously.
- This approach offers a viable pathway for the commercialization of PSCs by addressing critical stability concerns.
