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Dissertations / Theses on the topic 'Infrared nanocrystals'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Geyer, Scott Mitchell. "Science and applications of infrared semiconductor nanocrystals." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62053.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2010.<br>Vita. Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 149-158).<br>In this work we study several applications of semiconductor nanocrystals (NCs) with infrared band gaps. In the first half, we explore the physics of two systems with applications in NC based photovoltaics. The physics of mixed films of CdTe and CdSe NCs is studied in chapter 2 as a model for NC based bulk heterojunction photovoltaics. We demonstrate that the presence of an active electron trap on the CdTe dramat

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2

Liyanage, Geethika Kaushalya. "Infrared Emitting PbS Nanocrystals through Matrix Encapsulation." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403953924.

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3

Kriegel, Ilka. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164558.

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Plasmonics with heavily doped semiconductor nanocrystals (NCs) is an emerging field in NC science. However, impurity doping of NCs remains far from trivial and is, as yet, dominated by a low chemical control over the incorporated dopant atoms. An appealing alternative is vacancy doping, where the formation of vacancies in the structure is responsible for an increased carrier density and elegantly circumvents the issues related to impurity doping. Due to high carrier densities of around 10^21cm^(-3) localized surface plasmon resonances (LSPRs) in the near infrared (NIR) are expected, and as suc

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4

Zhang, Huichen. "Colloidal nanocrystals for optoelectronics from visible to short-wave infrared." Electronic Thesis or Diss., Sorbonne université, 2025. http://www.theses.fr/2025SORUS101.

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Les nanocristaux semi-conducteurs colloïdaux constituent une plateforme prometteuse pour les applications optoélectroniques, grâce à leur gap énergétique dépendant de la taille, leur synthèse peu coûteuse et leur traitement en solution. Ces propriétés ont permis leur intégration dans des dispositifs tels que les diodes électroluminescentes (LED), les photodétecteurs et les cellules solaires, avec un succès commercial notable dans les technologies d'affichage et d'imagerie. Cette thèse explore leur potentiel dans le spectre allant du visible à l'infrarouge à ondes courtes (SWIR), en mettant l'a

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5

Panthani, Matthew George. "Colloidal Nanocrystals with Near-infrared Optical Properties| Synthesis, Characterization, and Applications." Thesis, The University of Texas at Austin, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3572875.

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<p> Colloidal nanocrystals with optical properties in the near-infrared (NIR) are of interest for many applications such as photovoltaic (PV) energy conversion, bioimaging, and therapeutics. For PVs and other electronic devices, challenges in using colloidal nanomaterials often deal with the surfaces. Because of the high surface-to-volume ratio of small nanocrystals, surfaces and interfaces play an enhanced role in the properties of nanocrystal films and devices. </p><p> Organic ligand-capped CuInSe<sub>2</sub> (CIS) and Cu(In<sub>X</sub>Ga<sub> 1-X</sub>)Se2 (CIGS) nanocrystals were synthes

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6

Lox, Josephine F. L., Zhiya Dang, Volodymyr Dzhagan, et al. "Near-Infrared Cu-In-Se-Based Colloidal Nanocrystals via Cation Exchange." ACS Publications, 2019. https://tud.qucosa.de/id/qucosa%3A36557.

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We developed a three-step colloidal synthesis of near-infrared active Cu-In-Se (CISe)/ZnS core/shell nanocrystals (NCs) via a sequential partial cation exchange. In the first step binary highly copper deficient Cu2‒xSe NCs were synthesized, followed by a partial cation exchange of copper to indium ions yielding CISe NCs. In order to enhance the stability and the photoluminescence (PL) properties of the NCs, a subsequent ZnS shell was grown, resulting in CISe/ZnS core/shell NCs. These core/shell hetero-NCs exhibited a dramatic increase in size and a restructuring to trigonal pyramidal particles

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7

Xiang, Hengyang. "Colloidal nanocrystals applied for short-wave infrared photodetectors with fast response." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS423.

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L'infrarouge à ondes courtes (SWIR) désigne généralement les photons dans la plage de longueurs d'onde allant de 1 à 3 micromètres. Les applications dans cette fenêtre de longueur d'onde exploitent divers avantages tels qu’une grande longueur de pénétration dans le tissu biologique, la couverture spectrale pour la vision nocturne atmosphérique et l'énergie d'excitation caractéristique de certains modes de vibration moléculaire. Les photodétecteurs SWIR sont donc les composants technologiques essentiels pour la communication optique, la détection de gaz dans l’environnement, le biodiagnostic et

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8

Livache, Clément. "Quantum-conﬁned nanocrystals for infrared optoelectronics : carrier dynamics and intraband transitions". Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS216.

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Les nanocristaux colloïdaux sont des objets cristallins obtenus par voie chimique. Ces objets étant conﬁnés, leurs propriétés optiques dépendent de leur taille, et peuvent donc être ajustées à la demande. Les nanocristaux de tellurure de mercure et de séléniure de mercure possèdent notamment des propriétés d’absorption dans l’infrarouge: l’énergie de bande interdite (interbande) des nanocristaux de HgTe peut-être variée du SWIR au MWIR, tandis que les nanocristaux de HgSe, grâce à un auto-dopage électronique dégénéré, présentent des transitions intrabande ajustables du MWIR au LWIR. Un contrôl

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9

Gencer, Imer Arife. "Si Nanocrystals In Sic Matrix And Infrared Spectroscopy Of In A Dielecric Matrix." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611778/index.pdf.

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This study focuses on various aspects of nanocrystals embedded in a dielectric matrix. In the first part of this work, a new approach with the use of Fourier Transform Infrared spectroscopy (FTIR) in the nanocrystal analysis was developed and presented. Si and Ge nanocrystals embedded in SiO2 matrix were mainly studied. This new approach is based on the analysis of structural variations of SiO2 matrix during the formation of semiconductor nanocrystlas. It is shown that the chemical and structural variations of the host matrix are directly related to the precipitation of nanocrystals in it. Thi

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10

Kriegel, Ilka [Verfasser], and Jochen [Akademischer Betreuer] Feldmann. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals / Ilka Kriegel. Betreuer: Jochen Feldmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503316/34.

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11

Chen, Yue Ph D. Massachusetts Institute of Technology. "Syntheses of biocompatible luminescent nanocrystals for visible and short-wave infrared imaging applications." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115798.

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Thesis: Ph. D. in Physical Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The primary focus of this thesis is to synthesize biocompatible luminescent nanocrystals for visible and short-wave infrared (1-2 [mu]m, SWIR) imaging applications. Quantum dots (QDs) have been promising fluorescent probes for biomedical imaging due to their high quantum yield (QY), narrow photoluminescence spectra, and excellent photostability. However, challenges remain to be solved to transfer the as-s

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12

Wu, Mengfei Ph D. Massachusetts Institute of Technology. "Infrared-to-visible upconversion in hybrid thin films of colloidal nanocrystals and organic molecules." Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/122872.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 152-163).<br>Photon upconversion is a process where two or more low-energy photons are converted into a single higher-energy photon. Upconversion that turns infrared photons into visible ones is particularly useful, having potential applications in photovoltaics, infrared sensing, and biological imaging. In this thesis, I present a solid-state thin-film device that converts infrared photons

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13

Gonzalez, Reinaldo J. "Raman, Infrared, X-ray, and EELS Studies of Nanophase Titania." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30605.

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Sol-gel titania particles were investigated, primarily by optical techniques, by systematically varying synthesis, sample handling, and annealing variables. The material phases investigated were amorphous titania, anatase TiO2, and rutile TiO2. Annealing-induced phase transformations from amorphous TiO2 to anatase to rutile were studied by Raman scattering, infrared reflectivity, infrared absorption, x-ray diffraction, and electron energy-loss spectroscopy (EELS). Detailed experiments were carried out on the effects of annealing on the Raman and infrared spectra of anatase nanocrystals. Th

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14

Smith, Kristen Colleen. "Surface processes ruthenium film growth, silicon nanocrystal synthesis, and methylene partial oxidation /." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035980.

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15

Izquierdo, Eva. "Synthèse et caractérisation d'homostructures et d'hétérostructures de nanoplaquettes de chalcogénures de mercure." Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLET028.

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Dans un contexte de développement de photo-détecteurs et lasers dans le domaine de l’infrarouge, les nanocristaux colloïdaux de chalcogénures de mercure sont des candidats prometteurs pour l’imagerie infrarouge à bas coût. Des nanoplaquettes de chalcogénures de cadmium sont développées depuis 10 ans. Ces nanoparticules 2D présentent des propriétés optiques originales dans le visible, du fait de leur confinement quantique limité à une di-mension. L’objectif de cette thèse est de syn-thétiser des nanoplaquettes à base de chalco-génures de mercure afin d’obtenir des proprié-tés optiques fines dan

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16

Khalili, Lazarjani Adrien. "Advancing Nanocrystal-based Infrared Imaging : Exploring Novel Strategies in the Design and Characterization." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS379.

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L’infrarouge est une région spectre électromagnétique avec des longueurs d'onde plus longues que celles de la lumière visible. Cette gamme spectrale fournit des informations complémentaires au domaine visible, et trouve des applications dans divers domaines tels que la défense, l'astronomie, et les technologies civiles émergentes dont le LiDAR dans les véhicules autonomes, ou la reconnaissance faciale dans nos smartphones. Alors que la technologie de détection à base de silicium règne sur le marché du visible, son équivalent reste à développer dans l'infrarouge. Les nanocristaux colloïdaux off

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17

Nemchinov, Alexander. "Using Colloidal Nanocrystal Matrix Encapsulation Technique for the Development of Novel Infrared Light Emitting Arrays." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339806993.

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18

Lian, Zichao. "Photo-Induced Carrier Transfer in Heterostructured Semiconductor Nanocrystals for Solar Energy Conversion." Kyoto University, 2018. http://hdl.handle.net/2433/235053.

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19

Leubner, S., R. Schneider, A. Dubavik та ін. "Influence of the stabilizing ligand on the quality, signal-relevant optical properties, and stability of near-infrared emitting Cd1₁₋ₓHgₓTe nanocrystals". Royal Society of Chemistry, 2014. https://tud.qucosa.de/id/qucosa%3A36257.

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Bright and stable near-infrared (NIR) and infrared (IR) emitting chromophores are in high demand for applications in telecommunication, solar cells, security barcodes, and as fluorescent reporters in bioimaging studies. The best choice for wavelengths >750 nm are semiconductor nanocrystals, especially ternary or alloy nanocrystals like CdHgTe, which enable size and composition control of their optical properties. Here, we report on the influence of growth time and surface chemistry on the composition and optical properties of colloidal CdHgTe. Up to now, these are the only NIR and IR emissive

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20

Cavallo, Mariarosa. "Control and Imaging of the Energy Landscape in Nanocrystal-based Devices for Infrared Photodetection." Electronic Thesis or Diss., Sorbonne université, 2025. http://www.theses.fr/2025SORUS029.

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Les nanocristaux colloïdaux présentent des propriétés optiques et électroniques accordables grâce au confinement quantique. Les nanocristaux semiconducteurs à faible bande interdite de tellurure de mercure (HgTe), offrent une accordabilité des propriétés optiques couvrant l'ensemble du spectre infrarouge. Ces nanocristaux peuvent être intégrés dans des films minces pour créer des photodétecteurs infrarouges, avec des applications potentielles dans des caméras infrarouges. La connaissance de la structure électronique de ces matériaux est cruciale pour permettre un design rationnel. Cependant, l

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21

Qu, Junling. "Colloidal semiconductor nanocrystals for optoelectronic applications : photodetectors and light emitting diodes." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS021.

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Les nanocristaux dont la dimension est inférieure à leur rayon de Bohr excitonique peuvent fournir des propriétés optoélectroniques accordables avec la taille. Cela permet d’obtenir des propriétés électroniques à façon. En particulier, le développement de la synthèse par voie colloïdale des nanocristaux en fait des briques élémentaires prometteuses pour des applications optoélectroniques à bas coût. Ma thèse cible deux aspects des dispositifs à base de nanocristaux: les photodétecteurs infrarouges et les diodes électroluminescentes (LED). Ma thèse est d'abord centrée sur la photodétection infr

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22

ROSINA, IRENE. "Exploiting Cation Exchange Reactions in Doped Colloidal NIR Semiconductor Nanocrystals: from synthesis to applications." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1019427.

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Colloidal quantum dots (CQDs) have tunable optical properties through manipulation of their size, shape, and surface chemistry. Among pholuminescent QDs, near-infrared (NIR) emitting ones are of particular interest since they can be used in several applications, from the labeling in living tissues, to the integration in commercial optoelectronic devices, like photovoltaics for solar energy conversion or photodetectors from visible to the near-infrared and mid-infrared. In addition, the exciting promise of CQDs is that is associated with easy and low-cost device fabrication process. In fact, so

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23

Moghaddam, Nicolas. "Synthèse de nanoplaquettes épaisses de chalcogénures de cadmiumet étude des propriétés électroniques de nanoplaquettes de tellure de mercure." Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLS090.

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Les nanoplaquettes de chalcogénures de cadmium sont des semiconducteurs de la famille II-VI, dont l’épaisseur est contrôlée à la monocouche atomique près, permettant ainsi un contrôle fin de leurs propriétés optiques. Ces matériaux peuvent s’étendre sur une centaine de nanomètres et présenter une épaisseur de quelques nanomètres.Lorsque les nanoplaquettes de CdSe 3 monocouches sont passivées par des ligands halogénures à température ambiante grâce à un précurseur de CdX2 (X = Cl, Br, I), l’énergie surfacique diminue. En chauffant (160 °C), des monomères de CdSe se dissolvent des bords des nano

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24

Martinez, Bertille. "Étude des propriétés optoélectroniques de nanocristaux colloïdaux à faible bande interdite : application à la détection infrarouge." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS254.

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Les nanocristaux colloïdaux de semiconducteurs sont des nanomatériaux synthétisés en solution. En deçà d’une certaine taille, ils deviennent confinés : leurs propriétés optiques et électroniques sont alors dépendantes de leur taille. Le développement de ces nanocristaux a atteint une grande maturité dans le visible. L’enjeu est maintenant d’étendre la gamme accessible et d’obtenir des nanocristaux ayant des propriétés dans l’infrarouge. Parmi les candidats, on trouve les nanocristaux de tellure de mercure, HgTe, et de séléniure de mercure, HgSe. L’objectif de ce doctorat est d’approfondir la c

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Gréboval, Charlie. "Étude et contrôle de la densité de porteurs dans des nanocristaux à faible bande interdite : application à la détection infrarouge." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS221.

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Les nanocristaux de semiconducteur colloïdaux sont des objets cristallins synthétisés par voie chimique. En raison du confinement quantique présent dans ces objets, leur propriétés optiques dépendent de leur taille et peuvent être ajustés lors de leur synthèse. Connus principalement pour leur photoluminescence dans le visible, ils peuvent également absorber le rayonnement infrarouge. Parmi les matériaux absorbant dans l’infrarouge, j’ai utilisé pendant ma thèse le tellurure de mercure dont l’énergie de bande interdite peut être ajustée continument sur l’ensemble de la gamme infrarouge. Ces nan

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26

Mushonga, Paul. "Fabrication of type-I indium-based near-infrared emitting quantum dots for biological imaging applications." University of the Western Cape, 2013. http://hdl.handle.net/11394/8271.

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Doctor Scientiae - DSc<br>Semiconductor nanocrystals or quantum dots (QDs) are fluorescent nanometer-sized particles which have physical dimensions that are smaller than the excitonic Bohr radius, large surface area-to-volume ratios, broad absorption spectra and very large molar extinction coefficients. Biomedical applications of QDs are mainly based on II-VI QDs containing cadmium, such as CdSe/ZnS. These cadmium-based systems are associated with high toxicity due to cadmium. As a result, potential replacements of cadmium-based QDs in biological applications are needed. In this study, I

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27

Ouma, Linda Achiengꞌ. "Synthesis, optical and morphological characterization of pbse quantum dots for diagnostic studies: a model study." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/3975.

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>Magister Scientiae - MSc<br>In this study PbSe quantum dots (QDs) were successfully synthesized via the organometallic and aqueous routes. Optical characterization was carried out using photoluminescence (PL) spectroscopy, structural and morphological characterization were carried out using X-ray diffraction (XRD) and transmission electron microscopy (TEM). Energy-dispersive X-ray spectroscopy (EDS) was used to determine the composition of the QDs. All the synthesized QDs were found to have emissions within the near-infrared region of the spectrum (≥1000 nm) with most of them being less than

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Chu, Audrey. "Couplage lumière-matière au sein de détecteurs infrarouges à base de nanocristaux colloïdaux." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS082.

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Les nanocristaux colloïdaux sont des nanoparticules dont la croissance se fait en solution. Lorsque la taille de ceux-ci est suffisamment faible, des effets de confinement quantique apparaissent et leurs propriétés optiques deviennent ajustables avec leur taille. Ces nanocristaux sont en particulier utilisés pour leur luminescence dans le visible mais peuvent aussi être utilisés pour réaliser de la photodétection dans la gamme infrarouge. Les nanocristaux de HgTe et PbS présentent des propriétés d’absorption dans l’infrarouge. Le mécanisme de transport au sein d’un film de nanocristaux induit

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Chang, Tung-Wah Frederick. "Luminescence and energy transfer excitation of infrared colloidal semiconductor nanocrystals /." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=442439&T=F.

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Koleilat, Ghada. "Efficient, Stable Infrared Photovoltaics based on Solution-Cast PbSe Colloidal Quantum Dots." Thesis, 2008. http://hdl.handle.net/1807/17189.

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Half of the sun’s power lies in the infrared. As a result, the optimal bandgaps for solar cells in both the single-junction and even the tandem architectures lie beyond 850 nm. However, progress in low-cost, large-area, physically-flexible solar cells has instead been made in organic and polymer materials possessing absorption onsets in the visible. Recent advances have been achieved in solution-cast infrared photovoltaics through the use of colloidal quantum dots. Here we report stable solution-processed photovoltaic devices having 3.6% power conversion efficiency in the infrared. The use of

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31

Panthani, Matthew George. "Colloidal nanocrystals with near-infrared optical properties : synthesis, characterization, and applications." 2011. http://hdl.handle.net/2152/19825.

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Colloidal nanocrystals with optical properties in the near-infrared (NIR) are of interest for many applications such as photovoltaic (PV) energy conversion, bioimaging, and therapeutics. For PVs and other electronic devices, challenges in using colloidal nanomaterials often deal with the surfaces. Because of the high surface-to-volume ratio of small nanocrystals, surfaces and interfaces play an enhanced role in the properties of nanocrystal films and devices. Organic ligand-capped CuInSe2 (CIS) and Cu(InXGa1-X)Se2 (CIGS) nanocrystals were synthesized and used as the absorber layer in proto

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王耀霆. "Near Infrared Photodetectors Based on Solution – Phase Synthesis of FeS2 Nanocrystals." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/94134269647258036240.

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碩士<br>國立臺灣師範大學<br>化學系<br>98<br>In this thesis, the near infrared photodetectors based on FeS2 nanocrystals were studied. We used FeS2 nanocrystals as the active layer and ZnO as blocking layer for the devices. FeS2 is a indirect band gap semiconductor which has a narrow band gap of 0.95 eV with high absorption to the light even near-infrared range, and the advantage in using the FeS2 nanocrystals is because they are low-cost, abundant and non-toxic materials. The well dispersed FeS2 nanocrystals were synthesis by Solution –phase methods, furthermore, we could control the shapes of FeS2 nanocry

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Hsu, Yi-Husan, and 徐憶瑄. "Synthesis and characterization of near-infrared light triggered lanthanide-doped upconversion nanocrystals." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/08626558123607409893.

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碩士<br>中山醫學大學<br>應用化學系碩士班<br>103<br>This study mainly discusses the synthesis of NaYF4/LiYF4 nanoparticles containing Tm3+/Yb3+. The upconversion efficiency of these nanoparticles correlated to the equivalent of activator or base during the syntheses is also demonstrated. The TEM images of the particles prepared by autoclave under lower temperature show that most of the particles are irregular (AC7 and AC14). In the meantime, the particles could not show the upconversion efficiency under 980 nm excitation. In order to improve the diameter and the upconversion efficiency of the nanoparticles, we

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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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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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Sreeshma, D. "Investigations on deep-level defects in HgTe nanocrystals-based photovoltaic devices using a novel instrumentation for Deep Level Transient Spectroscopy." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6161.

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Colloidally produced nanocrystals (NCs) arranged in thin films hold promise for next-generation semiconductors. These NCs offer tunability in semiconductor properties due to their size, shape, composition, and surface characteristics. However, the performance of NC-based optoelectronic devices still lags behind theoretical predictions. This is primarily attributed to electronic deep-level trap states, which act as recombination centres and limit effective mobility. The large surface area, hybrid nature, and disordered structure of NCs contribute to the abundance of trap states. To improve devi

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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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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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Chen, Chi-Feng, and 陳啟峰. "Infrared Spectroscopic Studies of Nanocrystal Diamonds." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/27075145598143235967.

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碩士<br>國立東華大學<br>材料科學與工程研究所<br>89<br>This research investigated the nanometer-sized diamond particles created from both High temperature/High pressure and detonation methods by using Fourier Transform Infrared Spectroscopy (FTIR). Nanodiamonds were hydrogenated/etched via microwave plasma or hot filament generated atomic hydrogen, and C-H vibrational spectra on the surfaces were measured. Cycloaddition reactions on diamond surfaces conducted with the addition of organic gases. The resulting spectra were compared to the Unidentified Infrared Emission Bands (UIBs) that observed in the interstella

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Johnston, Keith. "Solution-processed Schottky-quantum Dot Photovoltaics for Efficient Infrared Power Conversion." Thesis, 2008. http://hdl.handle.net/1807/11145.

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Solar energy harvesting demands low-cost energy conversion in the infrared from 1 – 2 μm. However, solution-processed photovoltaic devices have remained relatively inefficient in this spectral region. Herein, lead sulfide colloidal nanocrystal quantum dots are used to facilitate efficient infrared power conversion. Solution-cast nanocrystal films are employed in a simple metal/semiconductor/metal architecture to produce a photovoltaic effect. It is shown that a Schottky barrier is induced, which is responsible for the charge separating action. Through optimization of chemical processes and dev

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