Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Exciton-exciton annihilation"”.
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Ultrafast Charge and Energy transfer Dynamics in Organic-Transition Metal Dichalcogenides Heterostructures
… monolayer MoTe2 is characterized. Key excitonic properties such as exciton saturation, lifetime, Exciton-Exciton Annihilation rate and its complex spectral evolution arising from many body effects at both the electronic and optical gap as a function of fluence were extracted and …
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Exciton transport and coherence in molecular and nanostructured materials
… of molecular and nanostructured materials is the exciton, a bound electron hole pair. Excitons, which can be generated optically or electrically, are the nanoscale carriers of energy, acting as intermediates between photons and electronic excitations. The goal of this thesis is to add to the …
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Exciton Dynamics in Perovskite CsPbBr₃ Semiconductor Nanocrystals
… different edge lengths (L = 4.9 - 13.2 nm). The excitonic transitions observed in the absorption spectra can be explained with an effective mass model considering the quasicubic NC shape and non-parabolicity of the electronic bands. We observe a temperature-dependent Stokes shift; while the trend …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… of QDs and TMDs. The remainder explores exciton dynamics and transport in these low-dimensional semiconductor systems. In Chapter 2, low temperature spectroscopy and time-resolved photoluminescence spectroscopy are used to probe the complex energy landscape seen by excitons in …
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Ultrafast exciton relaxation in quasi-one-dimensional perylene derivatives
This thesis deals with exciton relaxation processes in thin polycrystalline films and matrix-isolated molecules of the perylene derivatives PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) and MePTCDI (N,N'-dimethylperylene-3,4,9,10-dicarboximide). Using femtosecond pump-probe spectroscopy, …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… to reduce trap-assisted recombination and exciton-exciton annihilation. As a result, I achieve CsPbI3 light-emitting diodes (LEDs) with 2.7% external quantum efficiency (EQE; the highest reported for a strongly-confined perovskite nanoplatelet system). This enabled the demonstration of …