Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.152
Publication date: 22nd December 2022
Increasing the efficiency of light-emitting devices is currently a hot topic in the field of semiconductor research. Here, perovskites are of special interest due to their excellent optical properties. Additionally, the possibility of sample preparation by vacuum deposition makes this class of material suitable for future large-scale industrial production. It is known that light-emission efficiency can benefit from an island-type active layer structure. If the lateral dimension of the structures is sufficiently small, excitons are confined and thus are far less likely to dissociate prior to radiative recombination.
In this work, we investigate the impact of the environment on the island formation in thermally deposited bilayers of CsPbBr3/LiBr. We demonstrate that the island formation occurs only in humid environments, leading to an enhancement of the photoluminescence quantum yield by a factor of 350. Time-resolved grazing-incidence wide-angle X-ray scattering (GIWAXS) experiments document the island growth process and reveal that the LiBr has already changed the perovskite crystal orientation before the island formation.
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