Exciton Dynamics in Lead Halide Perovskite Nanocrystals
Recombination, Dephasing and Diffusion
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Beschreibung
Less than a decade ago, lead halide perovskite semiconductors caused a sensation: Solar cells exhibiting astonishingly high levels of efficiency. Recently, it became possible to synthesize nanocrystals of this material as well. Interestingly; simply by controlling the size and shape of these crystals, new aspects of this material literally came to light. These nanocrystals have proven to be interesting candidates for light emission.
In this thesis, the recombination, dephasing and diffusion of excitons in perovskite nanocrystals is investigated using time-resolved spectroscopy. All these dynamic processes have a direct impact on the light-emitting device performance from a technology point of view. However, most importantly, the insights gained from the measurements allowed the author to modify the nanocrystals such that they emitted with an unprecedented quantum yield in the blue spectral range, resulting in the successful implementation of this material as the activelayer in an LED. This represents a technological breakthrough, because efficient perovskite light emitters in this wavelength range did not exist before.
Less than a decade ago, lead halide perovskite semiconductors caused a sensation: Solar cells exhibiting astonishingly high levels of efficiency. Recently, it became possible to synthesize nanocrystals of this material as well. Interestingly; simply by controlling the size and shape of these crystals, new aspects of this material literally came to light. These nanocrystals have proven to be interesting candidates for light emission.
In this thesis, the recombination, dephasing and diffusion of excitons in perovskite nanocrystals is investigated using time-resolved spectroscopy. All these dynamic processes have a direct impact on the light-emitting device performance from a technology point of view. However, most importantly, the insights gained from the measurements allowed the author to modify the nanocrystals such that they emitted with an unprecedented quantum yield in the blue spectral range, resulting in the successful implementation of this material as theactive layer in an LED. This represents a technological breakthrough, because efficient perovskite light emitters in this wavelength range did not exist before.
Nominated as an outstanding Ph.D. thesis by the Ludwig-Maximilians University of Munich, Germany Author received the Nano Innovation Award 2020 for the research presented in this thesis Extensive chapters on Fundamentals and Methods Includes 58 color illustrations
Autor*in
Bernhard Johann Bohn
Themen in »Exciton Dynamics in Lead Halide Perovskite Nanocrystals«
Perovskite Nanocrystals Lead Halide Perovskites High Photoluminescence Quantum Yield Blue light emitter Photovoltaic efficiency Excitons Dephasing Four-Wave Mixing Exciton Diffusion Pump-Probe Spectroscopy Exciton-Exciton Annihilation Trap Repair