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Atmospheric Exposure Triggers Light-Induced Degradation in 2D Lead-Halide Perovskites
Gianluca Grimaldi1,2, Imme Schuringa1, Jaco J Geuchies3
1Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
ACS Energy Letters
|December 19, 2024
Summary
Quasi-2D perovskites degrade under light due to oxygen. Protecting these materials from oxygen significantly enhances their photostability, crucial for stable perovskite solar cells.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- Quasi-2D perovskites enhance perovskite solar cell stability.
- Intrinsic light and environmental stability of quasi-2D perovskites remain under-characterized.
Purpose of the Study:
- To investigate the intrinsic photostability of exfoliated quasi-2D perovskite single crystals in air.
- To elucidate the degradation mechanisms and identify strategies for stability enhancement.
Main Methods:
- Photoluminescence spectroscopy
- Infrared spectroscopy
- X-ray fluorescence spectroscopy
- Energy-dispersive X-ray spectroscopy
Main Results:
- Photoexcitation causes significant material loss in quasi-2D perovskites, dependent on oxygen presence.
- Degradation is linked to the formation of reactive oxygen species.
- Photostability is markedly improved under oxygen-free conditions.
- Combined passivation with 2D-capping layers and an oxygen-free atmosphere enhances stability.
Conclusions:
- The photostability of quasi-2D perovskites is critically dependent on oxygen exposure.
- Oxygen-blocking passivation strategies are essential for developing stable 2D perovskite-based devices.
