DOI: https://doi.org/10.29363/nanoge.emlem.2022.031
Publication date: 15th July 2022
Although studied since the 1980’s, research on two-dimensional metal halide perovskites (2D HaPs) has only recently exploded in the shadow of their 3D counterparts. Now, these compounds are studied for improving both the performance and the stability of solar cells, as well as for use in light-emitting devices, scintillators, gas detectors, and many more applications.
As a key difference compared to 3D HaPs, their two-dimensional nature leads charge carriers to form strongly bound excitons, making them excellent testbeds for exciton physics in confined systems, and for applications that require bright luminescence.
Curiously, some of these compounds exhibit narrow emission lines from the band edge (often with a complex sub-structure), whereas others give rise to broad and strongly red-shifted luminescence – or a combination of both.
In my talk, I shall address the different concepts invoked to explain the luminescence of 2D HaPs, how different propositions can be distinguished experimentally, and how variation of the constituent metal and halides affect the overall optoelectronics of this family of materials. A combination of photoluminescence spectroscopy and density functional theory computation is used to reveal the intricate origin of broad emission bands in a family of <100> oriented compounds.
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