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 “"multi-exciton"”.
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Single and multi-exciton dynamics in nanoscale semiconductors
… This thesis describes experiments using a unique multi-dimensional spectrometer to study three semiconductors: double-walled J-aggregate nanotubes, cuprous oxide, and monolayer transition metal dichalcogenides. First, we use two-dimensional correlation spectroscopy and cryogenic tunneling electron …
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Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells
… In this work we explore implementations of a multiple exciton generation process, singlet exciton fission, to work around the Shockley-Queisser limit, according to which, all single junctions cells have a theoretical efficiency limit of 33.7%. This is the first implementation of a singlet …
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Coherent multi-exciton dynamics in semiconductor nanostructures via two-dimensional Fourier transform optical spectroscopy
… of collective electronic excitations (i.e. excitons, biexcitons, etc.) which may be harnessed for applications in quantum optics, light-harvesting, or quantum information technologies. These excitations represent correlations among successively greater numbers of electrons and holes, and …
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The Study of Coupling in InGaAs Quantum Rings Grown by Droplet Epitaxy
… dots. As the power is increased we observe multi-exciton and excited state emission. We then perform PLE, tuning the excitation laser energy continuously from the high energy ring emission down to the individual dot states. We have observed resonant PLE emission in the QD/QR structures both …
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Excitons in Two-Dimensional Materials: from Many-Body Physics to Quantum Technologies
… recombination of bound electron-hole pairs, or excitons. Their unique band structure gives rise to rich excitonic spectra where the excitons possess large binding energies in the order of meVs due to the 2d nature of the material. In this Thesis I fi rst explore complex exciton species within a …
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Modern Electronic Structure Theory using Tensor Product States
… which leads to the spin splitting of the biexciton state into 1(TT),3(TT) and 5(TT) states, and (ii) the triplet-triplet energy transfer integral (t) which enables the formation of the spatially separated (but still spin entangled) state 1(T...T). We develop a simple ab initio technique to …