Relevant bibliographies by topics / Core-shell Heterostructure / Dissertations / Theses
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Dissertations / Theses on the topic 'Core-shell Heterostructure'

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Published: 7 September 2023

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1

Walsh, T. M. "Theoretical characterisation of spheroidal PbSe/PbS core/shell colloidal quantum dot heterostructures." Thesis, University of Salford, 2016. http://usir.salford.ac.uk/41075/.

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Nanocrystal quantum dots (NQDs) show great promise in the advancement of the field of photovoltaics. While the maximum efficiency of conventional solar cell (SC) devices is limited to ∼ 31% (Shockley-Queisser limit), devices based on NQDs may attain a maximal thermodynamic efficiency of 42% through the exploitation of multiple exciton generation (MEG). In this process, several electron- hole pairs are created by the absorption of a single high energy photon, as opposed to the single excitons created in conventional solar cell devices. IV-VI semiconductor nanocrystals (PbS, PbSe) are of particu
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2

Migas, Jeremiah. "A PHOTOCATALYTIC INVESTIGATION OF CORE-SHELL AND HIERARCHICAL Zn-Ti-O/ZnO HETEROSTRUCTURES PRODUCED BY HYBRID HYDROTHERMAL GROWTH AND SPUTTERING TECHNIQUES." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/824.

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With an increasing demand for alternative clean energy solutions, much effort is being invested in the progression of nanoscale semiconductor materials in hopes of better harnessing solar energy. ZnO and TiO2 remain the most prominent photocatalytically active materials. This thesis reports on a comparison between nanoscale core-shell and hierarchical Zn-Ti-O/ZnO heterostructures. After a seed layer thickness optimization, hydrothermally grown ZnO nanorods were coated with mixed concentrations of Ti and Zn within an oxygen rich sputtering environment at two distinct temperature zones. Core-she
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3

Connors, Benjamin James. "Simulation of current crowding mitigation in GaN core-shell nanowire led designs." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41206.

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Core-shell nanowire LEDs are light emitting devices which, due to a high aspect ratio, have low substrate sensitivity, allowing the possibility of low defect density GaN light emitting diodes. Current growth techniques and physical non-idealities make the production of high conductivity p-type GaN for the shell region of these devices difficult. Due to the structure of core-shell nanowires and the difference in conductivity between ntype and p-type GaN, the full junction area of a core-shell nanowire is not used efficiently. To address this problem, a series of possible doping profiles
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4

Adam, Adeline. "étude du couplage élastique au sein d'hétérostructures cœur-coquille à base d'analogues du bleu de Prusse." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX076/document.

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Le contrôle optique des propriétés physiques d’un matériau suscite l’intérêt des scientifiques pour des enjeux aussi bien fondamentaux qu’appliqués. L’axe de recherche original que nous avons développé dans le cadre de ce travail de thèse visait à la réalisation et l’étude d’hétérostructures moléculaires photo-magnétiques dans des gammes de température susceptibles d’applications. L’approche proposée consistait à élaborer des hétérostructures de type multiferroïque constituées de deux phases, l’une piézomagnétique et l’autre photo-strictive. L’idée était d’optimiser le couplage, d’origine élas
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5

Cossuet, Thomas. "Problématique de la polarité dans les nanofils de ZnO localisés, et hétérostructures reliées pour l’opto-électronique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI086/document.

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Le développement d’architectures nanostructurées originales composées de matériaux abondants et non-toxiques fait l’objet d’un fort intérêt de la communauté scientifique pour la fabrication de dispositifs fonctionnels efficaces et à bas coût suivant des méthodes d’élaborations faciles à mettre en œuvre. Les réseaux de nanofils de ZnO élaborés par dépôt en bain chimique sont, à ce titre, extrêmement prometteurs. L’étude des propriétés de ces réseaux de nanofils et leur intégration efficace au sein de dispositifs nécessitent toutefois un contrôle avancé de leurs propriétés structurales et physiq
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6

Mouafo, Notemgnou Louis Donald. "Two dimensional materials, nanoparticles and their heterostructures for nanoelectronics and spintronics." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE002/document.

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Cette thèse porte sur l’étude du transport de charge et de spin dans les nanostructures 0D, 2D et les hétérostructures 2D-0D de Van der Waals (h-VdW). Les nanocristaux pérovskite de La0.67Sr0.33MnO3 ont révélé des magnétorésistances (MR) exceptionnelles à basse température résultant de l’aimantation de leur coquille indépendamment du coeur ferromagnétique. Les transistors à effet de champ à base de MoSe2 ont permis d’élucider les mécanismes d’injection de charge à l’interface metal/semiconducteur 2D. Une méthode de fabrication des h-VdW adaptés à l’électronique à un électron est rapportée et b
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7

Gomes, Umesh Prasad. "Catalyst-assisted and catalyst-free growth of III-V semiconductor nanowires." Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85884.

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The aim of this thesis is to understand the dynamics of the nucleation and growth of III-V semiconductor nanowires and associated heterostructures grown by chemical beam epitaxy. These nanowires represent well-controlled and high quality materials suitable for both fundamental physics and applications in optical and electronic devices. The first part of the thesis investigates growth recipes to obtain Au-catalyzed InAs NWs with controlled morphology. Good control of NW length and diameter distributions has been achieved by a systematic study of two different Au deposition techniques: Au thin
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8

Lee, Yan-Tsuo, and 李彥佐. "Synthesis and Characterization of Core-ZnO/Shell-MgZnO Heterostructure Nanorods." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/f7h5p7.

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碩士<br>國立臺北科技大學<br>光電工程系研究所<br>97<br>The formation of heterostrucure in nanorods is essential for their potential applications in nanoelectronic and photonic devices. Here we demonstrate that vertically well-aligned ZnO nanorods and ZnO/MgZnO core-shell nanorods can be successfully synthesized via catalyst-free vapor phase transport combined with pulsed laser deposition (PLD) method. The thesis consists of two parts. First, the vertically well-aligned ZnO nanorods were grown on a PLD-predeposited ZnO thin film via a simple thermal evaporation and vapor transport process. These ZnO nanorods
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9

HSU, NAI-CHIEH, and 徐廼杰. "Enhancement on field emission properties of nanowires using ZnO-Zn core-shell heterostructure." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/49yavd.

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10

Dillen, David Carl. "Confined electron systems in Si-Ge nanowire heterostructures." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-4360.

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Semiconductor nanowire field-effect transistors (NWFET) have been recognized as a possible alternative to silicon-based CMOS technology as traditional scaling limits are neared. The core-shell nanowire structure, in particular, also allows for the enhancement of carrier mobility through radial band engineering. In this thesis, we have evaluated the possibility of electron confinement in strained Si-Si1-xGex core-shell nanowire heterostructures. Cylindrical strain distribution was calculated analytically for structures of various dimensions and shell compositions. The strain-induced conduction
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11

Das, Bamadev. "Fabrication of Chemical Vapor Deposition (CVD) Setup & Preparation of Copper Oxide (CuO) -CdX (X= Se, S) Nanoparticles Decorated Core-Shell Heterostructure." Thesis, 2015. http://ethesis.nitrkl.ac.in/6968/1/2015_Bamadev_Mtech(R)_612ph301.pdf.

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The goal of this project is to fabricate a low cost chemical vapor deposition (CVD) setup and synthesize hybrid nanomaterials i.e. copper oxide (CuO)-CdX (X=Se, S) nanoparticles decorated core-shell heterostructure. The synthesized hybrid nanomaterials have been fabricated into a device (photodetector) for the measurement of current-voltage characteristics in dark and under UV illumination. Furthermore, the growth model for the formation of core-shell heterostructure has also been discussed in this project. Chapter-I narrates about the fundamentals of materials, nanomaterials and hybrid nano
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12

Chu, Ji-Fan, and 褚季凡. "Synthesis and characterization of Ge/GeO2/GeOx core-shell nanowire heterostructures." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/71696224664335173316.

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碩士<br>國立東華大學<br>材料科學與工程學系<br>104<br>Abstract The Ge/Ge/GeOx nanowire core-shell nanowire heterostructures were synthesiz-ed on the sapphire substrates by using a non-toxic physical vapor deposition method. First, Ge vapor were transported onto the Au coated sapphire substrates to grow Ge nanowires. By controlling the ambient oxygen (0%, 1%, 5%, and 10%) during growth, Ge/GeO2/GeOx nanowire heterostructures with different shell thickness can be obtained. The field-emission scanning electron microscope (FE-SEM) and energy dispersive spectroscopy (EDS) were used to characterize samples. The sampl
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13

Ramesh, Vidya. "Growth and characterisation of InP-based core-shell nanowires for optoelectronic device applications." Master's thesis, 2011. http://hdl.handle.net/1885/149902.

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In order to achieve high performance III-V nanowire heterostructure based devices, it is essential that the heterostructures are of good structural and optical quality. Hence controlling the morphology and crystal structure is a critical factor in the nanowire heterostructure growth. Au-nanoparticle assisted vapour-liquid-solid (V-L-S) technique is one of the superior methods used in recent years for nanowire growth. This thesis investigates InP-based core-shell nanowire growth by the metal organic chemical vapour deposition (MOCVD) on (111)B InP substrates via V-L-S growth mechanism. The m
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14

Gallardo, Ignacio Francisco. "Tuning of core-shell heterostructured nanoparticles generated by laser ablation of microparticles." Thesis, 2009. http://hdl.handle.net/2152/23467.

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We investigate the temperature and size distribution of Ag, Ge, CdSe and ZnS nanoparticles undergoing UV excimer laser pulses. A two laser pulse experiment is designed to monitor nanoparticle size before and after laser interaction. We study HRTEM images and measure the ablation and fluorescence spectra of particles before and after evaporation. Results show that the nanoparticle mean radius decreases from 3.4 ± 0.2 nm to 2.6 ± 0.2 nm, from 4.3 ± 0.1 nm to 3.5 ± 0.1 nm, and from 3.1 ± 0.2 nm to 2.6 ± 0.2 nm for Ag, Ge and CdSe, respectively. No ZnS nanoparticle size reduction was observed. The
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15

Su, Yu-Hsuan, and 蘇毓軒. "Synthesis of ZnS nanowires and ZnS-ZnO core-shell heterostructured nanowires and their UV detector applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/89cyw3.

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碩士<br>國立臺北科技大學<br>機械工程系機電整合碩士班<br>106<br>At the beginning of this study, a horizontal furnace tube was used to deposit ZnS nanowires on P-type Silicon substrate (100) by chemical vapor deposition and through a VLS mechanism, and the working pressure was changed to find out the best crystallinity. And the crystal structure is wurtzite structure with the (002) plane as the preferred growth direction. The second step is annealing ZnS nanowires at different temperatures in an oxygen environment. From the results of the annealing, it can be found that the surface of the ZnS nanowire starts to trans
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16

Yang, Min-Yi, and 楊敏儀. "Ⅰ.One-Pot Synthesis of Silver Nanocubes and Their Morphological Transformation Ⅱ.Synthesis and Plasmonic Properties of Au-Pd Core-Shell Heterostructures with Variable Shapes and Shell Thickness." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/72863362151053373974.

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碩士<br>國立清華大學<br>化學系<br>101<br>CHAPTER 1 One−Pot Synthesis of Silver Nanocubes and Their Morphological Transformation We have used one-pot reaction to synthesize cubic silver nanoparticles with average sizes of 62 to 80 nm in aqueous solution at 50 ºC for 6 hours. The reagents used here are AgNO3, cetyltrimethylammonium chloride (CTAC), ascorbic acid, and NaOH. In this method, silver nanoparticles are obtained by using ascorbic acid as reducing agent to reduce AgCl(s) in the presence of CTAC. NaOH is added to increase the reducing ability of ascorbic acid. Silver nanocubes with sizes varying f
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17

Pu, Ying-Chih, and 蒲盈志. "Titanium Oxide Nanowire-based Heterostructures and Cd1-xZnxSe Core/Shell Quantum Dots: Interfacial Charge Carrier Dynamics and Photoelectric Conversion Applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/eth9x3.

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博士<br>國立交通大學<br>材料科學與工程學系所<br>102<br>Due to the difference in band structure between the constituents, semiconductor heterostructures exhibit remarkable charge separation property which is beneficial to solar fuel generation. On the other hand, the advantages of quantum dots-based light emitting diodes (QD-LEDs) include color tunability, high color saturation and high color rendering index (CRI) white lighting. The performance of both photon-to-electron and electron-to-photon conversions is closely related to the intrinsic charge carrier dynamics of the constitutes. In this dissertation, the c
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18

Kuo, Chun-Hong, and 郭俊宏. "Morphosyntheses of Cuprous Oxide Nanocrystals and Au-Cu2O Core-Shell Heterostructures with Systematic Shape Evolution and The Examination of Their Physical and Chemical Properties." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/48750263055328420778.

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19

曹育琪. "I.Seed-Mediated Growth of Silver Nanocubes and Their Morphological Transformation II.Synthesis of Au–Ag Core–Shell Heterostructures with Systematic Shape Evolution and Their Optical Properties." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/91916369197954240831.

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碩士<br>國立清華大學<br>化學系<br>103<br>CHAPTER 1 Seed-Mediated Growth of Silver Nanocubes and Their Morphological Transformation Silver nanoparticles are often synthesized in organic solvents with the use of high reaction temperatures. If nanoparticles can be synthesized in aqueous solution, the method would be energy-saving and environmentally friendly. In the literature, long reaction time and high temperatures are still need to synthesize silver nanocubes. Here we present a facile and low temperature approach to prepare silver nanocubes in aqueous solution and investigat how the reaction rate cont
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