Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.048
Publication date: 18th July 2019
Organic and inorganic metal halide perovskites have emerged in recent years as revolutionary semiconductor materials for lighting and energy harvesting applications. Many of their facinating properties originate from the fact thet metal-halide perovskites should be classed as crystalline liquids rather than hard semiconductor materials. In this talk I will discuss excitons and polaron in perovskites.
I will start by describing the exciton fine structure splitting in semiconductors, which reflects the underlying symmetry of the crystal and quantum confinement. Since the latter factor strongly enhances the exchange interaction, most work has focused on nanostructures. Here, we report on the first observation of the bright exciton fine structure splitting in a bulk semiconductor crystal, where the impact of quantum confinement can be specially excluded, giving access to the intrinsic properties of the material. Detailed investigation of the exciton photoluminescence and reflection spectra of a bulk methylammonium lead tribromide single crystal reveals a zero magnetic field splitting as large as 200 µeV. The observed splitting can be understood in the exciton picture combined with symmetry considerations.
Next I will discuss the formation of the polaron, which is the results of the exciton – phonon coupling. The polaron formation is made in evidence by observation of the exciton effective mass enhancement. In the end I will describe some optical properties of a very new system: hollow perovskites, which exhibit optical properties of the excitons in 3D and quantum confinement regime.
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