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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Efficient and Stable Low-Bandgap Perovskite Solar Cells Enabled by a CsPbBr3-Cluster Assisted Bottom-up
Liqiang Xie1, Kebin Lin1, Jianxun Lu1
1Engineering Research Center of Environmental-Friendly Functional Materials, Ministry of Education, College of Materials Science & Engineering , Huaqiao University , Xiamen 361021 , China.
Journal of the American Chemical Society
|November 29, 2019
Summary
Researchers developed a new method using cesium lead bromide clusters to create stable, efficient formamidinium lead iodide perovskite solar cells with low bromide content. This approach enhances operational stability and achieves high power conversion efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Formamidinium lead iodide (FAPbI3)-based perovskites are crucial for high-performance perovskite solar cells (PSCs) due to their excellent spectral response and photocurrent.
- Achieving stable FAPbI3 PSCs typically requires high bromide (15-17%) and cesium/methylammonium incorporation to prevent phase transitions, which unfortunately narrows spectral response.
- Reducing bromide content for broader spectral response often leads to poor operational stability caused by phase transitions, interface issues, and halide migration.
Purpose of the Study:
- To develop a fabrication method for low-bromide, phase-pure, and stable FAPbI3-based PSCs.
- To overcome the trade-off between efficiency and stability in FAPbI3 PSCs by controlling phase transitions and improving film quality.
- To enhance the operational stability and performance of FAPbI3 PSCs through a novel crystallization approach.
Main Methods:
- A CsPbBr3-cluster assisted vertically bottom-up crystallization technique was employed.
- Low-bromide (1-6%) FAPbI3 perovskite films were fabricated using CsPbBr3 clusters as nucleation sites.
- The CsPbBr3 clusters facilitated vertical crystal growth and improved phase homogeneity after thermal annealing.
Main Results:
- Fabricated mesoporous PSCs with low-bromide (1-6%), α-phase pure, and methylammonium-free FAPbI3.
- Achieved a champion power conversion efficiency of 21.78% with an extended photoresponse up to 830 nm.
- Demonstrated significantly improved operational stability, retaining approximately 82% of initial efficiency after 1,000 hours of continuous operation.
Conclusions:
- The CsPbBr3-cluster assisted crystallization is an effective strategy for producing high-quality, stable, low-bromide FAPbI3 perovskite films.
- This method successfully addresses the phase instability and performance limitations of traditional FAPbI3 PSCs.
- The developed PSCs offer a promising pathway towards efficient and durable perovskite solar technology.
