Homologous post-treatment strategy enabling phase-pure
Yaqi Ye1, Lingbo Xiao1, Lutao Li1
1College of Energy, Soochow Institute for Energy and Materials Innovations, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215000, People's Republic of China.
Nanotechnology
|June 9, 2023
Summary
A new homologous post-treatment strategy (HPTS) enables the formation of additive-free, phase-pure formamidinium lead triiodide (FAPbI3) perovskite films. This method enhances film quality, leading to efficient and stable perovskite solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Formamidinium lead triiodide (FAPbI3) is a promising perovskite material for solar cells due to its optimal bandgap and stability.
- Achieving phase-pure alpha-FAPbI3 without additives is crucial for high-performance devices.
- Existing methods often require additives or struggle with phase purity.
Purpose of the Study:
- To develop an additive-free strategy for obtaining phase-pure alpha-FAPbI3 perovskite films.
- To investigate the mechanism of phase transition induced by strain release.
- To improve the efficiency and stability of FAPbI3-based perovskite solar cells.
Main Methods:
- A homologous post-treatment strategy (HPTS) involving dissolution and reconstruction during annealing.
- Utilizing substrate-induced tensile strain and its subsequent release to drive phase transition.
- Annealing at 120 °C to accelerate the transformation from hexagonal delta-FAPbI3 to cubic alpha-FAPbI3.
Main Results:
- HPTS successfully produced additive-free, phase-pure alpha-FAPbI3 films.
- The strategy effectively releases tensile strain, facilitating the delta-to-alpha phase transition.
- The resulting films exhibited improved optical and electrical properties.
- Achieved a device power conversion efficiency of 19.34% with enhanced stability.
Conclusions:
- HPTS is an effective additive-free approach for fabricating high-quality, phase-pure alpha-FAPbI3 films.
- Strain engineering via HPTS is a viable method to control phase transition in FAPbI3 perovskites.
- This work paves the way for uniform, high-performance FAPbI3 perovskite solar cells.
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