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Dissertations / Theses on the topic 'Crystal growth techniques'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Plaut, Annette Sally. "Laser spectroscopy of semiconductor quantum wells." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258014.

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2

Whiteley, Clinton E. "Advanced crystal growth techniques with III-V boron compound semiconductors." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8110.

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Doctor of Philosophy<br>Department of Chemical Engineering<br>James H. Edgar<br>Semiconducting icosahedral boron arsenide, B[subscript]12As[subscript]2, is an excellent candidate for neutron detectors and radioisotope batteries, for which high quality single crystals are required. Thus, the present study was undertaken to grow B[subscript]12As[subscript]2 crystals by precipitation from metal solutions (nickel) saturated with elemental boron and arsenic in a sealed quartz ampoule. B[subscript]12As[subscript]2 crystals of 8-10 mm were produced when a homogeneous mixture of the three elements wa

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3

Nawash, Jalal Mohammad. "A study of the crystal growth of select II-VI oxides by Czochralski and Bridgman techniques." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/J_Nawash_121406.pdf.

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4

Grasby, Timothy John. "Growth techniques and characterisation of Siâ†1â†-â†xGeâ†x heterostructures for pMOS applications." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365234.

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5

Howard, Fraser Peter. "Investigations into the growth and etching of antimonides by chemical beam epitaxy and related techniques." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302065.

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6

Yürüdü, Caner [Verfasser], Joachim [Akademischer Betreuer] Ulrich, and Günther [Akademischer Betreuer] Schulte. "Predicting crystal growth rates using molecular modelling techniques with explicit consideration of driving force / Caner Yürüdü. Betreuer: Joachim Ulrich ; Günther Schulte." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2010. http://d-nb.info/1025011279/34.

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7

Al-Tamimi, Mohammed A. "Growth of gallium nitride on silicon substrate using the interlayer growth technique." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173462509.

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8

Deniz, Derya. "Growth And Characterization Of Inse Single Crystals." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605213/index.pdf.

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In this study, InSe single crystals were grown from the melt using conventional Bridgman-Stockbarger system. The grown crystals were implanted by N-ions to investigate the doping effect. the stoichiometry and the structural features were examined by scanning electron microscope and X-ray diffraction method, respectively. We have observed that the ingot was stoichiometric and the structure was hexagonal. Temperature dependent conductivity and Hall effect measurements were carried out to investigate the electrical properties of as-grown, as-implanted and annealed samples within the temperature r

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9

Turco, Françoise. "Applications de techniques d'analyse in situ à l'épitaxie par jets moléculaires du système (Al, Ga, In) As." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0016.

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L'etude des oscillations d'intensite de diffraction rheed en incidence rasante dursant la croissance de (al,ga,in)as conduit a un controle en temps reel en fonction des parametres (temperature, composition de la phase solide, pressions incidentes). Le couplage in situ avec la spectroscopie xps a permis de mettre en evidence, au cours de la croissance de algaas, gainas et alinas, la segregation en surface de l'element iii le moins lie a as. Par la technique des oscillations de rheed, determination des variations du coefficient d'incorporation de in dans alinas en fonction de la contrainte de la

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10

Souptel, Dmitri. "Crystal growth and perfection of selected intermetallic and oxide compounds." Doctoral thesis, [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=973879408.

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11

Souptel, Dmitri. "Crystal growth and perfection of selected intermetallic and oxide compounds." Doctoral thesis, Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A24461.

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The aim of the present work is to clarify the interplay between the complex technological chain of crystal preparation, chemical and structural perfection of grown crystals of intermetallic compounds and oxides and their physical properties. This technological chain includes detailed studies of unknown or insufficiently known phase diagrams, their correlation with growth conditions and optimisation of process parameters for obtaining single crystals with high chemical and physical perfection. The measurements of the physical properties of the grown crystals such as superconductivity, thermoele

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12

Faraj, Sara. "Growth and characterization of Ce doped LuAG single crystal fibers by the micropulling down technique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1030/document.

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Les fibres monocristallines d'oxyde de lutécium et aluminium (Lu3Al5O12 - LuAG), non dopées ou intentionnellement dopées au cérium, élaborées par la technique de micro-pulling down sont de sérieuses candidates pour le développement de nouvelles générations de calorimètres à scintillation. Cependant, cette technique de croissance est complexe et nécessite une étude approfondie pour améliorer les propriétés optiques de ces fibres. Après avoir ajusté la température de croissance, les paramètres principaux étudiés furent la concentration en Cerium, la vitesse de croissance et l'orientation du cris

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13

Gullapalli, Vikranth. "Study of Metal Whiskers Growth and Mitigation Technique Using Additive Manufacturing." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804972/.

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For years, the alloy of choice for electroplating electronic components has been tin-lead (Sn-Pb) alloy. However, the legislation established in Europe on July 1, 2006, required significant lead (Pb) content reductions from electronic hardware due to its toxic nature. A popular alternative for coating electronic components is pure tin (Sn). However, pure tin has the tendency to spontaneously grow electrically conductive Sn whisker during storage. Sn whisker is usually a pure single crystal tin with filament or hair-like structures grown directly from the electroplated surfaces. Sn whisker is h

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14

Aubel, Dominique. "Apport des techniques de photoémission à la connaissance des hétérostructures Ge/Si(001), Si/Ge(001), Si1-xGex/Si(001) et Si1-xGex/Ge(001)." Mulhouse, 1995. http://www.theses.fr/1995MULH0412.

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Les premières phases de la croissance à température ambiante (TA) et 400°C des deux hétérostructures Si/Ge(001) et Ge/Si(001) ont été étudiées par des techniques de surface comme la spectroscopie de photoélectrons X(XPS) et UV(UPS) et la diffraction d'électrons lents (LEED). Un effort particulier a été fait pour développer la dernière née des méthodes d'investigations structurales dérivée de l'XPS à savoir la diffraction de photoélectrons X(XPD). L'analyse fine de l'émergence des signatures XFD et la mesure des contrastes sur les pics de diffusion vers l'avant en fonction du recouvrement, appo

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15

Ergunt, Hasan Yasin. "Bulk Growth And Characterization Of Cadmium Zinc Telluride Crystals For Mercury Cadmium Telluride Infrared Detector Applications." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614738/index.pdf.

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HgCdTe (MCT) infrared (IR) photodetectors have been used for various military and civilian applications including thermal imaging, medical imaging, and astronomy. These detectors are commonly fabricated on MCT layers grown on a foreign substrate epitaxially using delicate growth techniques such as Molecular Beam Epitaxy (MBE). The crystal quality of epitaxial layers grown on a substrate critically depends on the quality of the substrate. One of the stringent requirements in choosing the substrate material is the lattice match between grown layer and the underlying substrate. With perfectly mat

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16

Karaagac, Hazbullah. "Structural, Electrical And Optical Characterization Of Ge -implanted Gase Single Crystal Grown By Bridgman Method." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606522/index.pdf.

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In this work, structural, electrical and optical characterization of as-grown, Ge-implanted, and annealed GaSe single crystals grown by using 3-zone vertical Bridgman-Stockbarger system, have been studied by carrying out X-ray Diffraction (XRD), electrical conductivity, Hall effect, photoconductivity, and spectral transmission measurements. The temperature dependent electrical conductivity of these samples have been measured between 100 and 400 K. As a result, it was observed that upon implanting GaSe with germanium following annealing process, the resistivity is reduced from 2.1x109 to 6.5x10

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17

Karabulut, Orhan. "Structural, Electrical And Optical Characterization Of N- And Si-implanted Gase Single Crystal Grown By Bridgman Method." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1135755/index.pdf.

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Single crystals of GaSe were grown from the melt using 3-zone vertical Bridgman-Stockbarger system. In order to determine the doping effect, nitrogen and silicon ions were implanted to the grown crystals. Surface morphology and stoichiometry were examined using scanning electron microscope equipped with EDAX and structure properties were examined by x-ray diffraction technique. It was observed that the resulting ingot was stoichiometric and the structure was hexagonal. To identify the effects of ion implantation on the physical properties of the samples depending on annealing<br>electrical co

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18

Despréaux, Stéphane. "Optimisation de forme en cristallogenèse." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10220.

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L'origine de ce travail est l'étude d'un problème industriel sur la mise en forme de cristaux par l'intermédiaire des forces capillaires. Le modèle mathématique utilisé consiste à résoudre un problème surdimensionné basé sur l'équation à courbure principale. Nous avons résolu le problème en lui associant un problème d'optimisation de forme. Le travail présenté dans cette thèse comprend deux principales parties : - l'étude mathématique de l'équation à courbure principale avec conditions aux limites mixtes - l'étude mathématique et numérique du problème d'optimisation de forme. Nous avons prouvé

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19

Sanci, Rukiye. "Synthesis Of Colloidal Silver Particles With Different Sizes By Seeding Approach For Surface Enhanced Raman Scattering (sers) Studies." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611076/index.pdf.

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In this study, silver nanorods and nanospheroids were prepared both in aqueous solution and on the surface of glass slides through seed-mediated growth approach at room temperature and used as a surface enhanced Raman scattering (SERS) substrate. The synthesis of metallic nanorods was started with the production of silver nanospheres as seed utilizing sodium borohydride and trisodium citrate as reducing and capping agents, respectively. These seeds were then added to a growth solution containing additional silver salt, ascorbic acid and cetyltrimethylammonium bromide (CTAB.) Nanorod preparati

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20

Sebastián, Paula. "Surface Influence on the First Stages of Metal Electrodeposition in Ionic Liquids." Doctoral thesis, Universidad de Alicante, 2018. http://hdl.handle.net/10045/79870.

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Esta tesis es un estudio profundo de las propiedades interfaciales Metal|líquido iónico (LI), y como estas influyen en las primeras etapas de formación de electrodepósito metálico. Dos líquidos iónicos, de dos familias diferentes, se han escogido para el análisis: un Room Temperature Ionic Liquid (RTIL): [Emmim][Tf2N]; y un Deep Eutectic Solvent (DES): 1ChCl:2urea. Para estudiar la influencia superficial en los distintos procesos, se empleó monocristales de platino (Pt(111)) y de oro Au(hkl), principalmente. El análisis inicial de las propiedades interfaciales M(hkl)|LI se realizó utilizando,

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21

Denis, Sylvain. "Cristallogenèse et caractérisations physico-chimiques des solutions solides supraconductrices La2-xSrxCuO4 et La1,6-xNd0,4SrxCuO4." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112330/document.

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La découverte de la supraconductivité à haute température dans les cuprates supraconducteurs en 1986 a révolutionné le secteur et remis en cause la théorie conventionnelle (BCS) de la supraconductivité. Malgré des avancées importantes dans la course aux plus hautes températures critiques, à ce jour, aucune théorie ne fournit une interprétation satisfaisante des propriétés de ces matériaux.L’évolution de la température critique en fonction du taux de strontium dans les solutions solides supraconductrices La2-xSrxCuO4 et La1,6 xNd0,4SrxCuO4 forme un dôme supraconducteur pour 0,05 < x < 0,3

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22

Assi, Farah. "Élaboration et caractérisation de fibres cristallines de nouveaux matériaux pour la conversion de fréquence dans le domaine V-UV par la technique micro-pulling down." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0194/document.

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L’intérêt des systèmes laser UV compacts à solide ne cesse de s’accroître du fait de leurs nombreuses applications dans différents domaines : stockage optique d’information, micro-usinage, médecine, biologie, science des matériaux ... Cependant, dans les cristaux de type oxyde, l’obtention d’une lumière laser UV ne peut se faire que par conversion de fréquences d’un laser émettant dans le domaine infra-rouge. Dans ces conditions, les efforts de recherche s’orientent vers des cristaux à base de borates du fait de leurs performances, de leur transparence dans l’ultraviolet et de leur résistance

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23

Bierlich, Jörg. "Einfluss der Bekeimung auf die Qualität von schmelztexturierten YBCO-Hochtemperatur-Supraleitern." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-33090.

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Die für technische Anwendungen attraktivsten Eigenschaften der Hochtemperatur-Supraleiter beruhen auf der Wechselwirkung der Materialien mit einem externen Magnetfeld. Für hochleistungsfähige Supraleiteranwendungen werden großvolumige Funktionselemente mit eindomänigem Magnetisierungsverhalten benötigt. Zur Vergrößerung der magnetischen Domäne schmelztexturierter YBa2Cu3O7-δ-Kompaktsupraleiter wurde anhand der Multi-Seeding-Technik, die Rekristallisation unter Verwendung mehrerer SmBa2Cu3O7-δ-Keimpräparate untersucht. Als Schlüsseltechnologie zur Herstellung anwendungsorientierter Supraleiter

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24

El, Ghani Nouhayla. "Modélisation expérimentale du transfert de masse en croissance cristalline par des méthodes électrochimiques en présence d'ultrasons." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI037.

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Le brassage acoustique présente une alternative prometteuse pour l'amélioration des procédés de purification pendant la solidification du silicium photovoltaïque. Dans cette étude, on s'intéresse à la caractérisation de l'efficacité d'un brassage par acoustic streaming pour favoriser le phénomène de ségrégation. Nous avons ainsi développé une approche expérimentale originale basée sur des démonstrateurs en eau des phénomènes présents lors de la solidification. Cette démarche s'appuie sur une analogie entre d'une part la diffusion solutale des impuretés à travers la couche limite, au niveau du

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25

Rothman, Johan. "Etude des propriétés structurales, électroniques et magnétiques des couches minces épitaxiées de cerium." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10019.

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Les proprietes structurales, electroniques et magnetiques de couches minces epitaxiees de cerium ont ete etudiees avec l'objectif de mieux connaitre l'element ce lui meme, ainsi que d'effectuer une premiere etude d'un systeme de basse dimensionnalite presentant des proprietes de type reseau kondo. Les couches ont ete preparees sous ultra-vide par depot laser pulse sur une couche tampon de w(110) ou de wnb(110), elle meme initialement epitaxiee sur un substrat d'al#2o#3(1120). Une nouvelle methode originale de croissance des couches tampon a ete developpee, qui permet une croissance parfaitemen

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26

Song, Shing Ru, and 宋相如. "Single crystal growth, computer simulation, and flow visualization of the VDGF technique." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/91450961257745351189.

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碩士<br>國立中央大學<br>化學工程學系<br>84<br>A transparent computer controlled muti-zone furnace was developed for vertical dynamic gradient freeze(VDGF) growth of Benzil single crystals for nonlinearoptics. The effects of impurities, heating profiles and speeds on the growth rates, the interface shape, and constitutional supercooling were investigated through close-up observation andcomputer simulation. In addition to good agreement between experiments andsimulation, it was found that the constitution

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27

Chen, Yingwei, and 陳瑩瑋. "Study on the Growth and Optical Properties of Large-Sized Highly-Doped Nd:YAG Crystal by Czochralski Technique." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/60707052019310899071.

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碩士<br>國立中山大學<br>材料與光電科學學系研究所<br>100<br>This paper mainly focuses on the discussion about how to grow a large-sized highly-doped laser crystal- Neodymium yttrium aluminum garnet( {NdxY1-x}3Al5O3; Nd:YAG). The higher concentration of Nd:YAG crystal can allow the better efficiency of the laser. Since the ion size doped with Nd3+ ( R= 1.12A ) is larger than the ion size of Y3+ (R= 1.01A ), in the lattice of YAG, it’s not easy to mix the smaller Y3+ site with the larger diameter of the Nd3 + ion. Therefore, the higher concentration of the laser crystal we want to grow, the more difficult work it is

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28

Hsu, Chao-Hsien, and 許肇顯. "Doping Effects on the Growth of Benzil Single Crystals by Vertical Dynamic Gradient Freeze Technique." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/10908677571191499011.

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碩士<br>國立中央大學<br>化學工程學系<br>85<br>Due to the highly nonlinear optical properties and the versatility in synthesis, organic materials are quite promising in optics devices. Crystal properties, mainly determined by the growth environment and impurities segregation, are very important in application. The vertical dynamic gradient freeze (VDGF) technique using a transparent furnance was applied to the growth of benzil single crystal for nonlinear optics. The effects of dopants on crystal growth,

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29

Xu, Zhao-Xian, and 許肇顯. "Doping Effects on the Growth of Benzil Single Crystals by Vertical Dynamic Gradient Freeze Technique." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/62386533255140643885.

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30

Manuspiya, Hathaikarn. "Electrical properties of niobium based oxides-ceramics and single crystal fibers grown by the laser-heated pedestal growth (LHPG) technique." 2003. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-306/index.html.

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31

Bierlich, Jörg. "Einfluss der Bekeimung auf die Qualität von schmelztexturierten YBCO-Hochtemperatur-Supraleitern." Doctoral thesis, 2008. https://tubaf.qucosa.de/id/qucosa%3A22720.

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Die für technische Anwendungen attraktivsten Eigenschaften der Hochtemperatur-Supraleiter beruhen auf der Wechselwirkung der Materialien mit einem externen Magnetfeld. Für hochleistungsfähige Supraleiteranwendungen werden großvolumige Funktionselemente mit eindomänigem Magnetisierungsverhalten benötigt. Zur Vergrößerung der magnetischen Domäne schmelztexturierter YBa2Cu3O7-δ-Kompaktsupraleiter wurde anhand der Multi-Seeding-Technik, die Rekristallisation unter Verwendung mehrerer SmBa2Cu3O7-δ-Keimpräparate untersucht. Als Schlüsseltechnologie zur Herstellung anwendungsorientierter Supraleiter

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