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 12 of 12 for “"core-shell nanocrystals"”.
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Elucidating Dopant Migration Mechanism for the Controlled Dopant Locations/Distribution within Core/Shell Nanocrystals
… during post-synthetic treatments including shelling, high temperature annealing, etc. Specifically, Mn doped CdS QDs and ZnSe nanowires were passivated with ZnX (X = S or Se) shell coatings, at elevated temperatures, were used as model systems to study dopant behaviors. This work …
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Synthesis and characterization of cerium-doped lanthanum halide colloidal nanocrystals
… lanthanum bromide/undoped lanthanum fluoride core/shell nanocrystals through inexpensive and repeatable colloidal routes. Following a systematic approach, cerium-doped lanthanum fluoride colloidal nanocrystals were synthesized through water-based and water-free (anhydrous) routes. Furthermore, …
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Synthetic exploration of halide perovskites and germanium semiconductors
… growth of CH3NH3PbI3, resulting in CH3NH3PbI3 nanocrystals. Compared to the bulk perovskites, the antimony-capped nanocrystals show stronger photoluminescence. With a direct bandgap of 1.6 eV and a corner-sharing octahedral network crystal structure that are comparable to CH3NH3PbI3, CsGeI3 is …
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Electrical excitation of colloidally synthesized quantum dots in metal oxide structures
… from novel nanoparticles, such as phosphor doped-core/shell nanocrystals.
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Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride
… dot) colloids produced by chemical means. The nanocrystals are synthesized by pyrolysis of organometallic precursors in the coordinating solvent trioctylphosphine oxide (TOPO). The important developments that have contributed to this method are discussed. Manganese doped CdSe nanocrystals are …
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Exciton Dynamics in Organic and Inorganic Nanoscale Materials
… recombination pathways in inorganic CdSe/CdS core-shell nanocrystals (NCs). I present the use of time- and spectrally-resolved ensemble emission measurements to determine the emission energy of the P-like above band-edge state in the NCs. This information is used to develop of a state-resolved …
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Floating gate engineering for novel nonvolatile flash memories
… is studied. By using germanium-silicon core-shell nanocrystals or ruthenium nanocrystals buried in HfO₂ as charge storage nodes, high interface quality has been achieved, leading to promising memory device performance. Next, another crucial challenge for nanocrystal flash memory on how …
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Ultrafast Optical Spectroscopy Techniques applied to colloidal nanocrystals
… spectroscopy techniques applied to colloidal nanocrystals. Colloidal semiconductor nanocrystals in recent years have attracted a lot of attention in particular in optoelectronic applications, because they present unique optical, electronic and charge carrier transport properties that can be …
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Heavy-metal-free colloidal nanocrystal heterostructures – synthetic chemistry and growth mechanisms
Building heterostructures of colloidal nanocrystals by bringing different components into contact can improve existing or impart novel properties, which enables applications as light emitters in already-commercialized and near-future products. However, the majority of the research has been based on …
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Synthese und Charakterisierung von Typ-II Halbleiternanoheterostrukturen
Im Rahmen dieser Arbeit wurden schalenartig aufgebaute Nanoheterostrukturen aus CdTe, CdS und CdSe hergestellt und insbesondere im Hinblick auf ihre optischen Eigenschaften untersucht. Eine neue Variante der CdTe Nanokristallsynthese in ODE als hochsiedendem, nicht koordinierendem Lösungsmittel …
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Continuous flow platforms for the synthesis of high-quality semiconductor nanocrystals
Semiconductor nanocrystals are of great interest due to their unique optical and electronic properties that are intermediate between bulk semiconductors and molecules. These nanoparticles find use in various applications ranging from electronics (light emitting diodes, photovoltaics) to …
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Incorporating double-heterojunction in anisotropic semiconductor nanocrystals for novel optoelectronic applications
… we find that unexpected etching of nanocrystals by one of the most commonly used metal precursors, metal oleates. Especially, Zn-oleate is shown to etch CdS nanorods anisotropically, where the length decreases without a significant change in the diameter. Sodium oleate enhances the …