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Crystallization Control to Prepare Uniform CsPbI2Br Thin Films for High-Efficiency Perovskite Solar Cells
Miao He1, Chuwu Xing1, Qinhui Bao1
1Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, Hubei Provincial Key Laboratory of Polymers, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry School of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China.
Crown ether molecules improve all-inorganic perovskite solar cell (PSC) crystallization by optimizing the CsPbI2Br intermediate phase. This enhances film uniformity, boosting PSC efficiency to 14.08% and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- All-inorganic perovskite solar cells (PSCs) are promising but hindered by film inhomogeneity.
- Nonideal crystallization of CsPbI2Br leads to uneven Br distribution, impacting device performance.
Purpose of the Study:
- To address film inhomogeneity in all-inorganic PSCs.
- To optimize the crystallization process of CsPbI2Br using crown ether molecules.
Main Methods:
- Introduction of crown ether (dibenzo-18-crown-6) into the perovskite precursor solution.
- Analysis of crystallization sequence and ion distribution.
- Fabrication and testing of PSC devices.
Main Results:
- Crown ether complexation optimized CsPbI2Br crystallization, ensuring stoichiometric intermediate phase formation.
- Evened out-of-plane halogen ion distribution, mitigating inhomogeneity.
- Achieved a PSC efficiency of 14.08% with 80% initial efficiency retained after 1000 hours of light exposure.
Conclusions:
- Crown ether molecules effectively improve the crystallization and stability of all-inorganic PSCs.
- This method offers a viable strategy for enhancing PSC performance and durability.
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