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 16 of 16 for “"semiconductor nanocrystal"”.
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Semiconductor nanocrystal composite materials and devices
… describes the synthesis and characterization of semiconductor nanocrystal (quantum dot, QD) embedded composite materials and possible device applications of the resulting luminescent materials. Chemically synthesized ZnS overcoated CdSe, (CdSe)ZnS, QDs are incorporated into a polymer host …
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Novel II-IV semiconductor nanocrystal gain media : from amplified spontaneous emission to lasing
… details efforts in using cadmium selenide (CdSe) nanocrystallites (NCs) as a novel lasing media. We begin with the synthesis of polymer/NC composites, in which the NCs are stabilized within a long-chain methacrylate polymer. This chapter serves to highlight the processing flexibility afforded by …
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Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride
… and applications of nanometer sized semiconductor (or quantum 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 …
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Confinement effects on multiexciton dynamics in semiconductor nanocrystals
Colloidal semiconductor nanocrystals are a promising platform for a number of technological developments in a wide variety of lighting applications. They also are an incredibly useful model system to interrogate fundamental carrier interactions in crystalline semiconductor lattices. This thesis …
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Studies on the Preparation, Immobilization, and Luminescence Properties of Zinc Oxide (ZnO)Quantum Dots
… material. Quantum dots are inorganic artificial semiconductor nanocrystal whose electrons influence their physical and chemical properties. Zinc oxide quantum dots were synthesized through an ethanol based precipitation via colloidal synthesis method at various pH values. Various emission colors …
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Turning InP nanocrystals up to 11: Coinage Metal Cation Exchange in InP Nanocrystals
… to expand the versatility and properties of a semiconductor nanocrystal. By tuning the amount of exogenous cation a spectrum of new materials can be accessed, including doped nanoparticles, alloyed nanocrystals, and even fully exchanged nanomaterials that may be challenging or impossible to …
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Toward the Synthesis and Characterization of Pb-Doped ZnS Nanocrystals for Solar Energy Applications
… required to meet society’s increasing demands. Semiconductor nanocrystals are particularly attractive materials for solar energy conversion applications, as their tunable optoelectronic properties can be manipulated to both optimize the absorbance of solar photons and to afford desirable …
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Stabilizing Degenerate Dopants in Colloidal Semiconductor Nanocrystals
Semiconductor nanocrystals possessing excess delocalized charge carriers are garnering considerable attention for their applications in a wide range of emerging technologies. In order to realize their incorporation into practical devices, a detailed understanding of their electronic structural …
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Synthesis, Purification and Application of Few-Walled Carbon Nanotubes and Inorganic Nanowires
… materials with polymers and noble metal nanocrystals. Furthermore, the structures of FWNTs are attempted to be controlled by adjusting the growth parameters of carbon monoxide CVD. Highly pure DWNTs (over 95%) are obtained and well characterized by TEM, Raman and fluorescence spectrum. …
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Nanocrystal/J-aggregate constructs : chemistry, energy transfer, and applications
… to modern chemistry. Two types of materials, semiconductor nanocrystals and J-aggregates of cyanine dyes, have been developed chiefly due to their potential for interacting with light in interesting and productive ways. At the same time, existing spectroscopy and microscopy tools enable the …
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Engineering the Synthesis and Properties of Two-Dimensional Colloidal Perovskite Nanoplatelets
Colloidal semiconductor nanocrystals are among the leading material platforms for a wide range of optoelectronic applications including photovoltaics, displays, photodetectors, and thermoelectrics. Their colloidal stability enables facile device fabrication by providing solution processability, and …
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Translating semiconductor device physics into nanoparticle films for electronic applications
… device physics, parameters, and mechanisms of semiconductor nanocrystal quantum dot (QD) electronic devices, and photovoltaic devices in particular. This involves a variety of characterization techniques and their adaptations, as well as careful evaluation of their results to assure the …
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Ultra thin micro solar cells with concentration optics: fabrication, modeling and characterization
… cells, made of high quality crystalline semiconductor, their price is high, and for low cost cells, such as organic PV, their efficiency is not sufficient. One way of reducing the cost is to replace expensive semiconductor material with relatively cheaper optics, a solar concentrator, and …
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Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots
… has been dawn on the colloidal chemistry based semiconductor nanocrysallites, also known as quantum dots (QDs). Because of the strong quantum confinement, quantum dots have unique size-dependent optical properties, which are much more superior to the conventional organic fluorescence materials. …
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Incorporating double-heterojunction in anisotropic semiconductor nanocrystals for novel optoelectronic applications
As semiconductor heterostructures play critical roles in today's electronics and optoelectronics, the introduction of active heterojunctions can impart new and improved capabilities that will enable the use of solution processable colloidal quantum dots (QDs) in future devices. Such heterojunctions …
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Alloyed heterojunction nanorods and their applications
In the Shim research lab, we work to both synthesize novel nanomaterials and integrate them into electronic devices. The goal of my research was to improve the utility of our existing heterostructures in optoelectronic devices, and my main tool was alloying. The first half of my dissertation …