Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.133
Publication date: 7th February 2022
Two-dimensional (2D) lead halide perovskite nanoplatelets are particularly promising for display light sources and single-photon emitters given the large exciton binding energies and the phenomenon of giant oscillator transition strength expected in these confined systems. Here, we describe the thickness-dependent level structure and fine structure of excitons in colloidal 2D lead halide perovskite nanoplatelets. We examine the effects of dielectric and quantum confinement on the exciton binding energy in individual and stacked nanoplatelets while accounting for quantum-confinement-induced effective mass anisotropy. We calculate the exciton fine structure and optical selection rules in an electron-hole exchange model, elucidating the roles of intrinsic crystal field splitting [1] and quantum-confinement-induced Bloch function mixing [2] in conjunction with the effects of shape anisotropy and image charges via the long range exchange interaction.
This work was supported by the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE) an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the US Department of Energy.
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