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Photochemical Shield Enabling Highly Efficient Perovskite Photovoltaics
Run-Jun Jin1, Yan-Hui Lou2, Lei Huang1
1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China.
Advanced Materials (Deerfield Beach, Fla.)
|February 14, 2024
Summary
Benzaldehyde stabilizes perovskite solar cells by forming a photochemical shield and enhancing crystallization. This improves device efficiency and longevity under operational conditions.
Area of Science:
- Materials Science
- Photovoltaics
- Chemical Engineering
Background:
- Oxygen-induced degradation is a major challenge for perovskite solar cells.
- Light excitation of oxygen generates free radicals that damage the perovskite lattice.
- Phase stabilization of alpha-FAPbI3 over delta-FAPbI3 is crucial for device performance.
Purpose of the Study:
- To enhance the stability and efficiency of perovskite solar cells.
- To introduce a simple molecule, benzaldehyde (BAH), as a stabilizing agent.
- To investigate the mechanism of BAH in protecting the perovskite layer.
Main Methods:
- Incorporation of benzaldehyde (BAH) into the perovskite layer.
- Formation of a photochemical shield within the perovskite.
- Utilizing BAH-induced heterogeneous nucleation to improve crystallization.
- Testing device stability under air and LED light for 1500 hours.
Main Results:
- Benzaldehyde acts as a photochemical shield, preventing oxygen-induced degradation.
- Heterogeneous nucleation by BAH promotes the crystallization of the desired alpha-FAPbI3 phase.
- The stabilized device maintained 95% of its initial power conversion efficiency after 1500 hours.
- Power conversion efficiency increased from 23.21% in the pristine device to 24.82% in the BAH-treated device.
Conclusions:
- Benzaldehyde effectively stabilizes perovskite solar cells against operational degradation.
- The dual mechanism of photochemical shielding and enhanced crystallization leads to improved device performance and longevity.
- This approach offers a promising strategy for developing durable and efficient perovskite solar cells.
