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Relevant bibliographies by topics / Core-shell Heterostructure

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Dissertations / Theses

Academic literature on the topic 'Core-shell Heterostructure'

Author: Grafiati

Published: 7 September 2023

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Dissertations / Theses on the topic "Core-shell Heterostructure"

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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