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 20 of 84 for “"Semiconductor nanocrystals."”.
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Semiconductor nanocrystals for novel optical applications
… polymeric composites photosensitized with semiconductor nanocrystals have emerged as an important class of materials. Here, we report on the photosensitization of photorefractive polymeric composites at visible wavelengths through the inclusion of narrow band-gap semiconductor nanocrystals …
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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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Photophysics of cadmium selenide (CdSe) semiconductor nanocrystals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Exciton Dynamics in Perovskite CsPbBr₃ Semiconductor Nanocrystals
Semiconductor nanocrystals, or quantum dots, have attracted much attention over the past three decades due to their potential applications in optoelectronic devices, such as displays, sensors, photovoltaics, and as single-photon sources. This class of materials differs from traditional bulk …
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Science and applications of infrared semiconductor nanocrystals
In this work we study several applications of semiconductor nanocrystals (NCs) with infrared band gaps. In the first half, we explore the physics of two systems with applications in NC based photovoltaics. The physics of mixed films of CdTe and CdSe NCs is studied in chapter 2 as a model for NC …
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Design and Development of 2d Functional Semiconductor Nanocrystals
<p>Anisotropic nanocrystals (NCs) have become of keen interest in recent years, especially for applications in optoelectronic devices due to their directionally oriented emissions, narrow emission spectra, and suitable morphologies for device integration. Of the desired anisotropic NCs, …
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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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Spectral properties of semiconductor nanocrystals and their applications
… to engineer the optical properties of the semiconductor nanocrystals by controlling their growth - size, shape, materials, coatings, etc - makes them appealing for many optical applications. Despite the impressive development of nanocrystal manufacturing capabilities, there are still many …
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Phosphorescent semiconductor nanocrystals and proteins for biological oxygen sensing
… the tumor microenvironment in real-time. Semiconductor nanocrystals or quantum dots (QDs) are the basis of these tools. Previously, most imaging applications of QDs have used them as indicators of position; they have lacked a response to their local environment. Tethering a phosphorescent …
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Synthesis and surface characterization of semiconductor nanocrystals for photovoltaic application
Im ersten Teil dieser Arbeit wurde die Kinetik einer neuen kolloidchemischen Synthese von monodispersen sphärischen CdSe- und CdS-Nanopartikeln (QDs) untersucht, deren Wachstum in Gegenwart von in situ gebildetem Cd erfolgt. Reaktionen mit verschiedenen Se- und S-Ausgangsverbindungen, Cd- zu Se- …
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Characterization of semiconductor nanocrystals using advanced solid-state NMR spectroscopy
Semiconductor nanomaterials have attracted significant interest in various areas during the past several decades. Due to excellent size-tunable optical and electronic properties, they become ideal building blocks in photovoltaics, photocatalysis, light emitting, and biological imaging. Numerous …
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Novel Counterflow Reactor for Continuous Templated Synthesis of Semiconductor Nanocrystals
Semiconductor nanocrystals are a class of materials exhibiting size-dependent and tunable optical and electronic properties. This allows for many different applicational usages such as display devices and biological. The commercial development of these nanocrystals requires the advancement of …
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Semiconductor nanocrystals : synthesis, mechanisms of formation, and applications in biology
… this thesis is the synthesis and applications of semiconductor nanocrystals, or quantum dots (QDs). Novel synthetic routes to ternary 1-III-VI QDs are presented, and we report the first highly luminescent Cu-In-Se QDs spanning the red to near-infrared region. The synthetic method is modular and is …
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Many-body processes in the photophysics of colloidal semiconductor nanocrystals
… the number of electrons and holes in colloidal semiconductor nanocrystals (NCs). Carrier Multiplication (CM) is the production of additional electron-hole pairs by collision of a highly excited carrier with valence electrons. Efficient CM would improve the performance of solar energy conversion …
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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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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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Spectroscopy and external control of optical dynamics in single semiconductor nanocrystals
… progress in the optical study of single semiconductor nanocrystals has opened a new dimension in our understanding of the photophysical properties of these quantum-confined materials. In this thesis, I describe experimental advances that investigate and manipulate optical …
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Flexible Electronics Based on Solution Processable Organic Semiconductors and Colloidal Semiconductor Nanocrystals
Solution-processable semiconductors hold great potential for the large-area, low-cost fabrication of flexible electronics. Recent advances in flexible electronics have introduced new functional devices such as light-weight displays and conformal sensors. However, key challenges remain to develop …
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Synthesis of derivatizable semiconductor nanocrystals through rational ligand design, and applications thereof
… last decade, the synthesis methods of colloidal nanocrystals have advanced at an astonishing rate, producing particles that are chemically stable, monodisperse, and, in the case of semiconductor quantum dots (QDs), immensely bright. Inorganic nanocrystals linked to functional organic or …
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Exploring excitations and vibrations in semiconductor nanocrystals through fluorescence and Raman spectroscopy
Semiconductor nanocrystals, also known as quantum dots (QDs) have been used in solid state light emission applications ranging from fluorescent downconverters to LEDs and lasers, as well as energy generation devices such as solar photovoltaics and thermoelectrics. In order to realize these myriad …
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