DOI: https://doi.org/10.29363/nanoge.emlem.2024.016
Publication date: 13th July 2024
Light emitting diodes based on metal halide perovskites have attracted considerable research attention due to the excellent, tunable, optoelectronic properties of perovskite semiconductors. The chemical tunability of perovskite semiconductors results in a wide number of perovskite structures which can be utilised as thin film emitters for LEDs. The quasi-2D perovskites are one such structural group. These are similar to 2D perovskite structures, consisting of sheets of inorganic perovskite octahedra separated by large organic cations but with multiple octahedral layers. LEDs based on quasi-2D perovskites can often achieve high electroluminescence external quantum efficiency yields however they can suffer from issues related to reduced or short operational lifetimes due to poor device stability. These quasi-2D perovskite systems are complex. At present approaches to tackling operational stability are predominantly iterative, focussing on optimising the material system and devices.
In this talk I will present our recent efforts to understand the relationship between the structure of the quasi-2D perovskite materials and their subsequent device physics. I will discuss our understanding of the interfaces within quasi-2D perovskite thin films and how they influence electronic structure and charge carrier dynamics. Finally, I will discuss routes through which we can advance our understanding to see a significant step change in quasi-2D perovskite LED stability.
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