Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.255
Publication date: 22nd December 2022
2D perovskites are often used to stabilize perovskite solar cells. By adding a thin layer of 2D perovskite on top of a 3D bulk solar cell, stability can be massively improved. This effect has lead to the impression that 2D perovskites are stable materials. However, we show that these materials are extremely unstable under illumination, especially when combined with air.
We quantify the decrease in photoluminescence after illumination. The photoluminescence first increases (photobrightens) and then decays dramatically. We show that this decay in luminescence coincides with a loss of material and a decomposition into gasses and precursors. We also show some initial mechanistic explanation for a better stability under nitrogen atmosphere.
Our results indicate that 2D perovskites are not intrinsically stable, but rather protect the underlying 3D perovskite from ambient influences, presumably by forming a hydrophobic barrier. Our results further illustrate the caution required when studying 2D perovskites because they continuously change during the measurement.
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