Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.192
Publication date: 18th July 2023
Halide perovskite nanocrystals (NCs) have emerged as an intriguing material for optoelectronic applications, most notably for light-emitting diodes (LEDs), lasers, and solar cells. Despite impressive advances, halide perovskite nanocrystals have not yet been commercialized due to certain inherent limitations. Importantly, they are highly prone to environmentally induced degradation. Additionally, the incorporation of chloride, necessary to achieve blue emission, renders the perovskite nanocrystals defect intolerant.
In this talk, I will explore our recent results on specifically tailoring halide perovskite nanocrystals to improve their overall stability and performance in the blue spectral region. To achieve the latter we produce anisotropically quantum confined nanocrystals, in the form of two-dimensional (2D) nanoplatelets (NPLs). These colloidal quantum wells have additional appeal for light emission, as the one-dimensional quantum confinement enhances their radiative rates and enables directional outcoupling. On top of this, due to a monolayer-precise control over their thickness, they constitute an intriguing system for spectroscopic studies on their fundamental optical, phononic, and energetic properties. To achieve a high degree of stability, we introduce block copolymer micelles, which serve as nanoreactors and shield the encapsulated nanocrystals from the environment. Importantly, the hydrophobic shell prevents moisture from degrading the nanocrystals and prohibits ion migration. It is thus possible to fabricate halide perovskite heterolayers.
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