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Strain gradient-engineered ion migration and vacancy formation energy in CsPbI3 perovskite
Jun-Jie Li1, Chuan-Xin Cui1, Jin-Wu Jiang1
1Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Frontier Science Center of Mechanoinformatics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, People's Republic of China. jwjiang5918@hotmail.com.
Strain engineering in cesium lead iodide (CsPbI3) perovskites impacts ion migration and stability. This study reveals how strain influences ion movement and vacancy formation, crucial for enhancing perovskite solar cell performance.
Area of Science:
- Materials Science
- Solid-State Physics
- Computational Chemistry
Background:
- Strain is a critical factor affecting the performance and stability of all-inorganic CsPbI3 perovskites.
- Ion migration and vacancy formation are key degradation pathways influenced by strain.
Purpose of the Study:
- To investigate the effects of uniform uniaxial strain on ion migration in CsPbI3.
- To analyze the influence of compressive strain gradients on iodine-vacancy formation energy.
- To provide a theoretical basis for strain engineering to improve perovskite solar cell stability.
Main Methods:
- Atomistic simulations
- Climbing-image nudged elastic band method
- Elastic dipole theory
Main Results:
- Uniform uniaxial strain leads to anisotropic ion migration behavior in alpha-CsPbI3.
- Compressive strain gradients create spatial variations in iodine-vacancy formation energy.
- Highly compressed regions become more favorable for vacancy formation.
Conclusions:
- Strain significantly alters ion migration pathways and vacancy formation in CsPbI3.
- Strain gradients can promote local vacancy accumulation.
- Strain engineering offers a promising strategy for enhancing the long-term stability of perovskite solar cells.
