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Dissertations / Theses on the topic 'Quantum Dots (QD)'

Author: Grafiati
Published: 25 May 2024

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1

Reinhart, Chase Collier. "Formulation of Colloidal Suspensions of 3-mercaptopropionic acid capped PbS Quantum Dots as Solution Processable QD "Inks" for Optoelectronic Applications." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3289.

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The use of colloidal quantum dots (QDs) for photovoltaic energy conversion is a nascent field that has been dominated for well over a decade by the use of 3-mercaptopropionic acid (3-MPA) capped PbS QDs. These QDs are routinely deposited via an in situ solid state ligand exchange process that displaces the native oleate ligand on the PbS QD surface. This ligand exchange procedure is wasteful of material and has been demonstrated to leave numerous impurities that limit electronic performance of the as-deposited QD devices. Until the last few years there was very little understanding in chemical
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2

Stubbs, Stuart Kenneth. "Photo-physics and applications of colloidal quantum dots." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/photophysics-and-applications-of-colloidal-quantum-dots(2391c0ce-b086-47a8-8600-a833657f85bc).html.

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The work presented in this thesis was submitted to The University of Manchester for the degree of Doctor of Philosophy in June 2010 by Stuart K Stubbs and is entitled “Photo-physics and applications of colloidal quantum dots”. In this thesis the results of spectroscopic studies on various colloidal quantum dots, particularly related to the measurement and characterisation of multiple exciton generation are presented. Research conducted with Nanoco Technologies Ltd. that involved the design and development of hybrid quantum dot organic light emitting diodes for use in flat panel display technol
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3

Kethineedi, Venkata Ramana. "Synthesis and Applications of Luminescent Quantum Dots in Bioassays." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1416.

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Luminescent quantum dot (QD) based probes have gained significance in the last decade for optical imaging of cells, tissues and in bioassays as alternatives to conventional organic fluorophores. The main objective of my PhD dissertation was to develop luminescent quantum dot based bioassays for real time monitoring of enzyme activity and simultaneous detection of several biomarkers. The quantum dot based bioassays developed will be potential tools in identification and diagnosis of several ailments that interfere with normal living conditions of human beings. In Chapter 2 new liposome encapsul
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4

Drillat, François. "Encapsulation de Quantum Dots dans des copolymères blocs : formation de structures supramoléculaires organisées et utilisation en biologie comme nouveau marqueur fluorescent." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00812058.

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Le travail de recherche effectué durant cette thèse avait pour but de synthétiser des billes de polystyrène de taille sub-micrométriques contenant des points quantiques, aussi appelés " quantum dots " ou QDs. Cette technique est appelée encapsulation. Elle correspond à piéger un ou plusieurs QDs au sein de la matrice formée de polymère. Les QDs émettent de la fluorescence à une longueur d'onde dépendant de la taille du nanocristal et de sa composition chimique. Les QDs employés seront des QDs de CdSe émettant dans la gamme de 500nm à 630nm. Pour la réalisation de ces billes, nous avons opté po
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5

James, Daniel. "Fabrication and electrical characterisation of quantum dots : uniform size distributions and the observation of unusual electrical characteristics and metastability." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/fabrication-and-electrical-characterisation-of-quantum-dots-uniform-size-distributions-and-the-observation-of-unusual-electrical-characteristics-and-metastability(01bb9182-5290-4ad1-b6a4-3aed3970dbcf).html.

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Quantum dots (QDs) are a semiconductor nanostructure in which a small island of one type of semiconductor material is contained within a larger bulk of a different one. These structure are interesting for a wide range of applications, including highly efficient LASERs, high-density novel memory devices, quantum computing and more. In order to understand the nature of QDs, electrical characterisation techniques such as capacitance-voltage (CV) profiling and deep-level transient spectroscopy (DLTS) are used to probe the nature of the carrier capture and emission processes. This is limited, howev
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6

Xiaohong, Tang, and Yin Zongyou. "MOCVD Growths of the InAs QD Structures for Mid-IR Emissions." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35383.

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In this research, InAs quantum dot structures for mid-infrared emission were self-assembled on InP substrate by using metal-organic chemical vapor deposition. To improve the grown quantum dot’s shape, the dot density and the dot size uniformity, a two-step growth method has been used and investigated. By changing the composition of the InxGa1 – xAs matrix layer of the InAs / InxGa1 – xAs / InP quantum dot structure, emission wavelength of the InAs quantum dot structure has been extended to the longest  2.35 m measured at 77 K. When you are citing the document, use the following link htt
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7

Ye, Xinying. "SEMI-AUTOMATIC AND INTERACTIVE VISUALIZATION OF QUANTUM DOT NANO-STRUCTURES." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1195496291.

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8

Guellil, Imene. "Nano-fonctionnalisation par FIB haute résolution de silicium." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0361.

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Le but de ce travail est de développer un processus d’élaboration de boîtes quantiques (QD) de silicium-germanium (SiGe) avec des compositions allant du Si au Ge pur, et permettant d’obtenir des QD semi-conductrices et de tailles suffisamment petites pour l’obtention de confinement quantique. Pour cela, nous avons utilisé une combinaison de différentes techniques : l’épitaxie par jets moléculaires, la lithographie ionique par faisceau d’ions focalisés (FIBL) et le démouillage solide hétérogène. Dans ce contexte, la finalité de cette recherche est d’une part de développer un FIB qui puisse être
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9

Pereira, Geovane Módena. "Criptografia de qubits de férmions de Majorana por meio de estados ligados no contínuo." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152724.

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Submitted by GEOVANE MODENA PEREIRA null (geovanemodena@hotmail.com) on 2018-02-10T03:04:38Z No. of bitstreams: 1 Dissertação Geovane - Criptografia de Qubits de Férmions de Majorana por meio de Estados Ligados no Contínuo.pdf: 7524654 bytes, checksum: 0bd9409e8fa9c0c2da9190e44f4cfa33 (MD5)<br>Approved for entry into archive by Ana Paula Santulo Custódio de Medeiros null (asantulo@rc.unesp.br) on 2018-02-14T16:11:32Z (GMT) No. of bitstreams: 1 pereira_gm_me_rcla.pdf: 7420427 bytes, checksum: 0a0aec5beec2ecdd26883e0f4524844f (MD5)<br>Made available in DSpace on 2018-02-14T16:11:32Z (GMT). No
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10

Bain, Fiona Mair. "Yb:tungstate waveguide lasers." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1698.

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Lasers find a wide range of applications in many areas including photo-biology, photo-chemistry, materials processing, imaging and telecommunications. However, the practical use of such sources is often limited by the bulky nature of existing systems. By fabricating channel waveguides in solid-state laser-gain materials more compact laser systems can be designed and fabricated, providing user-friendly sources. Other advantages inherent in the use of waveguide gain media include the maintenance of high intensities over extended interaction lengths, reducing laser thresholds. This thesis present
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11

Pradeepa, H. L. "Study of Exciton Dynamics in MoS2 Monolayer and MoS2-QD Heterostructure." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4651.

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The recent studies of two-dimensional semiconductors (2D) and their hybrid structure with zero-dimensional (0D) semiconductors have led to discovering of many fascinating properties that are absent in their bulk counterparts. Here in this thesis, we have looked into two such systems, monolayer MoS2 (2D), CdSe Quantum Dots (0D), and their hybrid structures. We start with the optoelectronic study of monolayer MoS2 FET devices fabricated in the cleanroom. We studied the dynamics of excitons (electron-hole pair), which have high binding energy at room temperature using steady-state photoluminescen
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12

Rekha, M. "Study of Charge Separation in Quantum Dots and Their Assemblies." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3716.

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This thesis reports a passive method for Fermi level regulation in quantum dot assemblies through ground state transfer between QDs. Here, ZnTe/CdS, and PbSe/CdSe core/shell QDs were used as valence band electron donors, while Cu containing CdS or ZnSe acts as electron acceptor QDs. Prior to study of ground state charge transfer process, this report discusses the synthesis of ZnTe/CdS, and PbSe/CdSe core shell QDs, which are later used to study charge transfer. Since ZnTe QDs are unstable and prone to oxidation, a CdS coated ZnTe QDs were used. Growing a CdS shell on ZnTe core is difficult be
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13

Rekha, M. "Study of Charge Separation in Quantum Dots and Their Assemblies." Thesis, 2017. http://etd.iisc.ernet.in/2005/3716.

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This thesis reports a passive method for Fermi level regulation in quantum dot assemblies through ground state transfer between QDs. Here, ZnTe/CdS, and PbSe/CdSe core/shell QDs were used as valence band electron donors, while Cu containing CdS or ZnSe acts as electron acceptor QDs. Prior to study of ground state charge transfer process, this report discusses the synthesis of ZnTe/CdS, and PbSe/CdSe core shell QDs, which are later used to study charge transfer. Since ZnTe QDs are unstable and prone to oxidation, a CdS coated ZnTe QDs were used. Growing a CdS shell on ZnTe core is difficult be
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14

Mukherjee, Arpita. "A Study of Dissipative Phenomena in Semiconductor Nanocrystals." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5075.

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Quantum dots (QDs) are semiconductor nanoparticles, where carriers are confined in regions smaller than a few tens of nanometers. The physics governing the behavior of these nano structures are fundamentally different from their bulk counterpart. This thesis studies the dissipative phenomena in QDs. In chapter 1, I give a brief introduction of QDs and their carrier dissipation dynamics. In chapter 2, I show that in CuInS2/CdS QDs, the spontaneous emission (SE) lifetime evolves from 46 ns to ~ 300 ns over a 15 ps time scale due to the collapse of the hole to the intragap states through dissipat
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15

Tripathi, Laxmi Narayan. "Preparation and Optical Properties of Hybrid Assemblies of Metallic Gold Nanoparticles and Semi-Conducting CdSe Quantum Dots." Thesis, 2013. https://etd.iisc.ac.in/handle/2005/3411.

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This thesis summarizes the methods of preparation and optical properties of hybrid assemblies of Au NPs and cadmium selenide (CdSe) QDs. First chap-ter deals with the literature survey and theoretical aspects of plasmonics and discussions on optical excitations of metal (plasmons) and semiconducting QDs (excitons). Variation of energy levels of CdSe QDs and its optical properties i e. absorption and emission properties under strong confinement regime have been discussed with respect to effective mass approximation (EMA) model. This is followed by the discussion on optical properties of Au NPs
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16

Tripathi, Laxmi Narayan. "Preparation and Optical Properties of Hybrid Assemblies of Metallic Gold Nanoparticles and Semi-Conducting CdSe Quantum Dots." Thesis, 2013. http://etd.iisc.ernet.in/2005/3411.

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This thesis summarizes the methods of preparation and optical properties of hybrid assemblies of Au NPs and cadmium selenide (CdSe) QDs. First chap-ter deals with the literature survey and theoretical aspects of plasmonics and discussions on optical excitations of metal (plasmons) and semiconducting QDs (excitons). Variation of energy levels of CdSe QDs and its optical properties i e. absorption and emission properties under strong confinement regime have been discussed with respect to effective mass approximation (EMA) model. This is followed by the discussion on optical properties of Au NPs
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17

Martins, João Ricardo Gonçalves. "Study of the Förster resonance energy transfer in ensembles of colloidal PbS quantum dots, emitting in the near-infrared spectral range." Master's thesis, 2020. http://hdl.handle.net/1822/73680.

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Dissertação de mestrado em Physics<br>Förster resonance energy transfer (FRET) is a non-radiative energy transfer mechanism between two light-emitting systems, such as two quantum dots (QDots) or molecules. This mechanism involves an excited donor fluorophore (e.g., a QDot or a dye molecule) which transfers its energy of excitation to an acceptor (another QDot or molecule which is in resonance with the donor), via dipole-dipole coupling. FRET is the dominant type of energy transfer between emitters at a nanometre proximity. Other factors that influence the efficiency of this energy trans
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18

Moquin, Alexandre. "Points quantiques : caractérisation et applications en sciences pharmaceutiques." Thèse, 2014. http://hdl.handle.net/1866/11758.

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L’imagerie médicale a longtemps été limitée à cause des performances médiocres des fluorophores organiques. Récemment la recherche sur les nanocristaux semi-conducteurs a grandement contribué à l’élargissement de la gamme d’applications de la luminescence dans les domaines de l’imagerie et du diagnostic. Les points quantiques (QDs) sont des nanocristaux de taille similaire aux protéines (2-10 nm) dont la longueur d’onde d’émission dépend de leur taille et de leur composition. Le fait que leur surface peut être fonctionnalisée facilement avec des biomolécules rend leur application particulièrem
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19

Tauchnitz, Tina. "Novel Methods for Controlled Self-Catalyzed Growth of GaAs Nanowires and GaAs/AlxGa1-xAs Axial Nanowire Heterostructures on Si Substrates by Molecular Beam Epitaxy." 2019. https://tud.qucosa.de/id/qucosa%3A38708.

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GaAs-based nanowires are attractive building blocks for the development of future (opto)electronic devices owing to their excellent intrinsic material properties, such as the direct band gap and high electron mobility. A pre-requisite for the implementation of novel functionalities on a single Si chip is the monolithic integration of the nanowires on the well-established Si complementary-metal-oxide-semiconductor (CMOS) platform with precise control of the nanowire growth process. The self-catalyzed (Ga-assisted) growth of GaAs nanowires on Si(111) substrates using molecular beam epitaxy has o
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