Colloidal halide perovskite nanoplatelets are a new class of materials that exhibit strong, spectrally narrow absorbance and photoluminescence and generate strongly confined excitons due to their atomically thin geometry. Excitons in perovskites more broadly exhibit slow hot carrier cooling and low defect scattering due to various mechanisms, but strong quantum and dielectric confinement in perovskite nanoplatelets will cause different behavior from the bulk geometry. We use femtosecond transient absorption and time-resolved photoluminescence spectroscopy to investigate exciton dynamics in methylammonium lead iodide nanoplatelets with different atomic layer thicknesses. We also discuss the role of polarons and other interesting phenomena from other perovskite geometries, and how they do and do not affect the behavior of excitons in atomically thin perovskites.

Exciton dynamics in atomically thin colloidal halide perovskite nanoplatelets

256th National Meeting (2018)

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