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Дисертації з теми "Chalcogenide quantum dots"

Автор: Grafiati
Опубліковано: 13 квітня 2024

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1

Wang, Zheng. "Synthesis, properties and applications of glasses containing chalcogenide quantum dots." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENS093.

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Анотація:
Dans cette thèse, la synthèse, les propriétés et les applications de verres contenant des quantum dots (QDs) de chalcogénure ont été étudiées. Des verres contenant des QDs à base de chalcogénure de plomb (PbSe ou PbS) ont été préparés. Leurs propriétés optiques et leurs applications potentielles ont été explorées en combinaison avec le co-dopage aux ions Tm3+. De plus, sur la base de ces résultats, des verres contenant des QDs de ZnS ou de ZnSe, sans plomb, ont été préparés avec succès. Leurs performances luminescentes ont été encore améliorées par dopage avec des ions de métaux de transition
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2

Schnitzenbaumer, Kyle J. "The Impact of Chalcogenide Ligands on the Photoexcited States of Cadmium Chalcogenide Quantum Dots." Thesis, University of Colorado at Boulder, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3704804.

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Анотація:
<p> Quantum dots (QDs) are the foundation of many optoelectronic devices because their optical and electronic properties are synthetically tunable. The inherent connection between synthetically controllable physical parameters, such as size, shape, and surface chemistry, and QD electronic properties provides flexibility in manipulating excited states. The properties of the ligands that passivate the QD surface and provide such synthetic control, however, are quite different from those that are beneficial for use in optoelectronic devices. In these applications, ligands that promote charge tran
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3

Schornbaum, Julia [Verfasser], and Jana [Akademischer Betreuer] Zaumseil. "Lead Chalcogenide Quantum Dots and Quantum Dot Hybrids for Optoelectronic Devices / Julia Schornbaum. Gutachter: Jana Zaumseil." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2015. http://d-nb.info/1082426415/34.

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4

Schornbaum, Julia Verfasser], and Jana [Akademischer Betreuer] [Zaumseil. "Lead Chalcogenide Quantum Dots and Quantum Dot Hybrids for Optoelectronic Devices / Julia Schornbaum. Gutachter: Jana Zaumseil." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2015. http://nbn-resolving.de/urn:nbn:de:bvb:29-opus4-68977.

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5

Lystrom, Levi Aaron. "Influence of Organic and Inorganic Passivation on the Photophysics of Cadmium Chalcogenide and Lead Chalcogenide Quantum Dots." Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/31926.

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Анотація:
Quantum dots (QDs) are promising materials for photovoltaic (PV) and light-emitting diode (LED) applications due to their unique properties: photostability, size-tunable absorptivity, and narrow line-width emission. These properties are tailored by surface passivations by ligands. However, ligands used in the synthesis of colloidal QDs need to be exchanged with ligands designed for specific applications. The mechanism behind ligand exchange is not well understood. Density functional theory (DFT) is utilized to gain fundamental understanding of ligand exchange (LE) and the resulting effect on t
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6

Page, Robert Christopher. "Synthesis of cadmium chalcogenide based quantum dots for enhanced multiple exciton generation." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/synthesis-of-cadmium-chalcogenide-based-quantum-dots-for-enhanced-multiple-exciton-generation(0e0f2e8d-ea7f-42dc-abef-f230e20eabe5).html.

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Анотація:
Quantum dots (QDs) have the potential to produce more than one exciton per incident photon, if the photon energy is greater than twice the band gap energy. This process of multiple exciton generation (MEG) has the potential to lead to a step change in the efficiency of solar panels, by utilising energy commonly wasted as heat in conventional solar cells. A wide range of CdSe/CdTe and CdTe/CdSe quantum dots with and without a CdS shell were synthesised with varying core sizes and shell thicknesses. The excited state dynamics of these samples were studied with transient absorption and photolumin
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7

Thiagarajan, Suraj Joottu. "Thermoelectric properties of rare-earth lead selenide alloys and lead chalcogenide nanocomposites." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196263620.

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8

Nxusani, Ezo. "Synthesis and analysis of Novel Platinum group Metal Chalcogenide Metal Quantum Dot and Electrochemical Markers." University of the Western Cape, 2018. http://hdl.handle.net/11394/6424.

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Анотація:
Magister Scientiae - MSc (Chemistry)<br>Although cadmium and lead chalcogenide quantum dot have excellent optical and photoluminescent properties that are highly favorable for biological applications, there still exists increasing concerns due to the toxicity of these metals. We, therefore, report the synthesis of new aqueous soluble IrSe quantum dot at room temperature utilizing a bottom-up wet chemistry approach. NaHSe and H2IrCl6 were utilized as the Se and Ir source, respectively. High-resolution transmission electron microscopy reveals that the synthesized 3MPA-IrSe Qd are 3 nm in diamete
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9

Akdas, Tugce [Verfasser], and Wolfgang [Gutachter] Peukert. "Colloidal Semiconductor Nanocrystals: The Interplay of Process Steps and Product Properties for the Case of non-toxic Compound Chalcogenide Quantum Dots / Tugce Akdas ; Gutachter: Wolfgang Peukert." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1129455106/34.

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10

Chassin, de Kergommeaux Antoine. "Synthèse de nouveaux types de nanocristaux semi-conducteurs pour application en cellules solaires." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENV057/document.

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Анотація:
Pour que l'énergie photovoltaïque devienne compétitive, les coûts de production doivent être baissés et l'efficacité des cellules augmentée. Les cellules solaires à base de nanocristaux semi-conducteurs constituent une approche prometteuse pour remplir ces objectifs combinant une mise en œuvre par voie liquide avec la possibilité d'ajuster précisément la largeur de bande interdite et les niveaux électroniques. Aujourd'hui, les rendements de conversion des cellules constituées de nanocristaux de sulfure de plomb approchent les 7%. Seulement, à cause des normes européennes destinées à l'affranch
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11

Bera, A. "Scalable Synthesis of dispersible semiconducting metal chalcogenides nanocrystals and their application." Thesis(Ph.D.), CSIR-NCL, 2021. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/6030.

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Анотація:
Abhijit Bera_Ph.D thesis<br>The work incorporated in this thesis is mainly focused on various single source metal precursors like metal thiolates and metal dithiocarbamate complexes. Herein, several simple and general methods have been developed for the synthesis of various such single source metal precursors, which comprising the main two constituents of metal chalcogenide nanocrystals (NCs), namely, the tiny inorganic metal chalcogenide complex as core and an organic molecule as shell. Specially, both binary metal thiolates and bimetallic (ternary) thiolates have been prepared and both of th
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12

Thiagarajan, Suraj Joottu. "Thermoelectric properties of rare-earth lead selenide alloys and lead chalcogenide nanocomposites." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196263620.

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13

Hatami, Soheil, Christian Würth, Martin Kaiser та ін. "Absolute photoluminescence quantum yields of IR26 and IR-emissive Cd₁₋ₓHgₓTe and PbS quantum dots: method- and material-inherent challenges". Royal Society of Chemistry, 2015. https://tud.qucosa.de/id/qucosa%3A36307.

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Анотація:
Bright emitters with photoluminescence in the spectral region of 800–1600 nm are increasingly important as optical reporters for molecular imaging, sensing, and telecommunication and as active components in electrooptical and photovoltaic devices. Their rational design is directly linked to suitable methods for the characterization of their signal-relevant properties, especially their photoluminescence quantum yield (Φf ). Aiming at the development of bright semiconductor nanocrystals with emission >1000 nm, we designed a new NIR/IR integrating sphere setup for the wavelength region of 600–160
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14

Chassin, de kergommeaux Antoine. "Synthèse de nouveaux types de nanocristaux semi-conducteurs pour application en cellules solaires." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00870418.

Повний текст джерела
Анотація:
Pour que l'énergie photovoltaïque devienne compétitive, les coûts de production doivent être baissés et l'efficacité des cellules augmentée. Les cellules solaires à base de nanocristaux semi-conducteurs constituent une approche prometteuse pour remplir ces objectifs combinant une mise en œuvre par voie liquide avec la possibilité d'ajuster précisément la largeur de bande interdite et les niveaux électroniques. Aujourd'hui, les rendements de conversion des cellules constituées de nanocristaux de sulfure de plomb approchent les 7%. Seulement, à cause des normes européennes destinées à l'affranch
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15

Abel, Keith Alexander. "Synthesis and characterization of colloidal lead chalcogenide quantum dots and progress towards single photons on-demand." Thesis, 2011. http://hdl.handle.net/1828/3481.

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Анотація:
Nanometer-sized semiconductor crystals, termed ‘quantum dots’, are of fundamental interest because of their size-tunable properties. Three-dimensional quantum confinement of charge carriers by the small crystal size results in discrete atomic-like electronic states. This dissertation describes the synthesis and in-depth characterization of lead chalcogenide colloidal quantum dots for forthcoming applications as near-infrared single photon emitters. An efficient single photon source that operates at telecommunication wavelengths (between 1.3 and 1.6 µm) is a basic requirement for many photonic
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16

McMurtry, Brandon Makana. "Synthesis and Formation Mechanism of Metal Phosphide and Chalcogenide Nanocrystals." Thesis, 2021. https://doi.org/10.7916/d8-nfgk-at97.

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Анотація:
Semiconductor nanocrystals, or quantum dots, have attracted significant interest for use in solid state lighting, biological imaging, photovoltaics, catalysis, and displays such as televisions or tablets. Quantum dots excel in these applications because of their narrow emission profiles, high absorptivity at high energies, and optoelectronic properties that can be easily tuned using colloidal chemistry. The last point in particular has driven the development of new synthetic methods for producing a range of semiconducting materials on the nanoscale. Academically, interest in the synthesis of q
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17

Anumol, S. "A Study of Synthesis and Optoelectronics of Copper Iron Chalcogenide Nanocrystals." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4984.

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Анотація:
Copper iron chalcogenides constitute a promising class of optoelectronic materials courtesy of their narrow bandgaps and earth abundant constitution. However, they are yet to receive the attention they deserve due to the lack of easy synthetic protocols and poorly understood material properties. Discordant narratives in the literature regarding their optoelectronic properties has also prevented them from being used for device-based applications. This thesis is aimed at rectifying a few of these issues. The objective of this thesis is to synthesize and study the properties of copper iron chalc
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18

Lin, Mei-Chia, and 林美佳. "Synthesis of silver chalcogenides-Cu2-xS quantum dots for applications in solar cells." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51546675763472857731.

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Анотація:
碩士<br>中興大學<br>奈米科學研究所<br>99<br>We study copper sulfide (Cu2-xS), a low-cost and non-toxic light absorbing material and apply to the quantum dot-sensitized solar cells (QDDSC). The copper sulfide quantum dots (QDs) were synthesized on a nanoporous TiO2 electrode by the successive ionic layer adsorption and reaction method (SILAR). To improve efficiency, passivation treatments including a TiO2 under layer ,a ZnS coating and additional treatments including annealing, a TiO2 scattering layer and an Au counterelectrode were used. The best cell yields a short-circuit current of 22.9 mA/cm2, an open
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19

Tubtimtae, Auttasit, and 高貴生. "Synthesis, optical and photovoltaic properties of silver chalcogenides-Ag2S and Ag2Se quantum dots as sensitizers for solar cells application." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/243b2z.

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Анотація:
博士<br>國立中興大學<br>物理學系所<br>99<br>We present a new photosensitizer – Ag2S quantum dots (QDs) – for solar cells. The QDs were grown by the successive ionic layer adsorption and reaction deposition method. The assembled Ag2S-QD solar cells yield a best power conversion efficiency of 1.70% and a short-circuit current of 1.54 mA/cm2 under 10.8% sun. The solar cells have a maximal external quantum efficiency (EQE) of 50% at λ=530 nm and an average EQE of ~ 42% over the spectral range of 400–1000 nm. For the family of silver chalcogenide system-Ag2Se quantum dots (QDs), the external quantum efficiency
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