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 604 for “"Quantum dots"”.
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Photoluminescence Characterization of Patterned Quantum dots and Inverse Quantum dots
… efficiency of solar cells are being explored. Quantum dots and inverse quantum dots are promising future ways to increase the efficiency of solar cells through multiple exciton generation. In this thesis, the fabrication and characterization of defect-free quantum dots and anti-dots are …
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Nanolithographically defined semiconductor quantum dots
In this thesis,nanolithographically de ned quantum dots are discussed including their fabrication process and optical properties. First, an introduction to the eld of quantum dots (QDs), and the advantages of QD-based optoelectronic devices are provided. The research presents our recent work …
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Luminescent Quantum dots for Cellular Analysis
Luminescent quantum dots have attracted great interest in recent years among biological researchers since they provide solutions to problems associated with use of organic fluorophores in cellular studies. Quantum dots show high photostability, high emission quantum yield, narrow and symmetric …
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Engineered quantum dots for infrared photodetectors
Quantum Dot Infrared Photodetector (QDIP) Focal Plane Arrays (FPAs) have been proposed as an alternative technology for the 3rd generation FPAs. QDIPs are emerging as a competitive technology for infrared detection and imaging especially in the midwave infrared (MWIR) and longwave infrared (LWIR) …
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Analyte sensing with luminescent quantum dots.
Semiconducting nanocrystals otherwise known as Quantum Dots (QDs) have attracted considerable attention over the last number of years due to their unique optical properties and potential applications. Their narrow size-tunable emission spectra, broad absorption spectra, resistance to photobleaching …
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Circles: Quantum Dots and Single Atoms
L'abstract è presente nell'allegato / the abstract is in the attachment
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Photodetectors based on colloidal quantum dots
… work demonstrating photocurrent enhancement in quantum-dot (QD) solids via post-deposition chemical annealing and by recent successes incorporating single monolayers of QDs in light-emitting devices (QD-LEDs), we set out to develop thin-film, layered photodetectors in which the active layer is a …
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Computational Studies of PbS Quantum Dots
A third-generation photovoltaic technology, PbS quantum dot solar cells boast tunable, infrared-compatible bandgaps, air stability and scalable production. Their unfortunately limited photovoltaic efficiency, a result of low carrier lifetime, has been tentatively ascribed to polydispersity, fusing, …
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Testování optických vlastností Quantum-Dots nanočástic I.
… diplomové práce: Testování optických vlastností Quantum-Dots nanočástic I. Tato diplomová práce se zabývá testováním optických vlastností Quantum-Dots nanočástic (QDs), které byly ověřovány jako zesilovače chemiluminiscenčního (CL) signálu. K reakci byl použit luminol (5-aminoftalylhydrazid) v …
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Synthesis of CsPbBr3 Quantum Dots for Photodetectors
… properties. we synthesized CsPbBr3 quantum dots (QDs) via the LARP method at RT and mixed them with conjugate polymer to fabricate nanocomposite photodetectors. We found that the size and optical properties of CsPbBr3 QDs are affected by varying the amount of precursor injected into …
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Quantum Dots In Two-Dimensional Tungsten Diselenide
… on the investigation of single and double quantum dots in two-dimensional transition metal dichalcogenide tungsten diselenide (WSe_2) as a means to evaluate the valley degree of freedom as a potential qubit and ambipolar tungsten diselenide monolayers as single photon sources. Gate-defined …
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Tunable Exchange Interaction in Coupled Quantum Dots
… for few electrons in electrically tunable quantum dot (QD) systems are investigated by using the variational Monte Carlo (VMC) method in the presence of magnetic fields. For N = 2 electrons in double QD, the singlet Coulomb energy decreases in magnetic fields as a consequence of magnetic …
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Patterned quantum dots for solar cell applications
… limit using new types of nano-sized solar cells. Quantum dots offer the potential to increase the efficiency of solar cells through carrier multiplication. In this thesis, the theory behind carrier multiplication is discussed along with the fabrication and photoluminescence characterization of …
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Surface-acoustic-wave-defined dynamic quantum dots
… channel creates a series of dynamic quantum dots which can transport electrons at the SAW velocity (∼ 2800 ms−1 ), allowing high-frequency operations to be carried out on the electron without the need for fast pulsed-gate techniques. Such dynamic quantum dot devices can provide …
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Band edge spectroscopy of CdSe quantum dots
… the band edge exciton fine structure of CdSe quantum dots (QDs). These QDs or nanocrystallites are the result of recent synthetic efforts in the Bawendi group to produce nearly monodisperse nanocrystalline materials. The QDs are roughly spherical in shape and range in size from 10 to 50 A in …
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Synthesis and characterization of infrared quantum dots
… of synthetic methods to create application ready quantum dots (QDs) in the infrared for biological imaging and optoelectronic devices. I concentrated primarily on controlling the size and size distribution of indium arsenide and cadmium arsenide QDs. In the nanocrystal community, classical …
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