Study of the photoluminescence of 2D metal-halide perovskite materials

Abstract

[EN] Hybrid organic-inorganic metal halide perovskites have emerged as promising materials in the development of optoelectronic devices, namely due to their high optical absorption coefficient, tuneable bandgap and charge carrier mobility. However, more efforts are needed to improve their stability against oxygen, moisture and light and find new ways to modulate their optical properties. In this work, we study the photoluminescence properties of lead-bromide-based layered (2D) perovskites with different composition and dimensionality as bulk crystals and mechanically exfoliated flakes. We highlight the tuning of the photoluminescence emission of 2D metal halide perovskites by design and enhance their ambient stability by encapsulating the exfoliated flakes with h-BN flakes. Finally, we carry out the fabrication of heterostructures using as building blocks perovskite flakes showing how to further modulate the photoluminescence emission colour.