Dissertations / Theses on the topic 'Synthetic perovskite'
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CONFALONIERI, GIORGIA. "LOCAL DISORDER IN THE STRUCTURE OF BA(TI,CE)O3 PEROVSKITE BY MEANS OF POWDER DIFFRACTION AND TOTAL SCATTERING. EFFECT OF TEMPERATURE, DOPING CONCENTRATION AND GRAIN SIZE." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/478906.
Full textDaza, Yolanda Andreina. "Closing a Synthetic Carbon Cycle: Carbon Dioxide Conversion to Carbon Monoxide for Liquid Fuels Synthesis." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6079.
Full textWirthová, Michaela. "Reologické vlastnosti gelů pro Pechiniho syntézy." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216509.
Full textLjungström, Elin, Ellen Hådén, Lukas Lekberg, and Nima Taherpour. "Design, synthesis and characterization of Dimethylammonium / Ethylammonium / Cesium Lead Halide Perovskites for optoelectronic applications." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277109.
Full textČižauskaitė, Sigutė. "Sol-gel synthesis of perovskite structure aluminates and cobaltates." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20091202_112230-17664.
Full textŠiame darbe vienfazis perovskito struktūros gadolinio aliuminatas GdAlO3 zolių-gelių metodu buvo gautas 1000 oC temperatūroje, gadolinio jonų šaltiniu naudojant Gd2O3, kompleksus sudarančiu reagentu – 1,2 etandiolį, natūralią vyno rūgštį, citrinų rūgštį arba citrinų rūgšties ir etanolamino mišinį. Sintetinant GdAlO3, gautų tyrimų rezultatai parodė, kaip yra svarbu zolių gelių procese pasirinkti tinkamas pradines medžiagas bei kompleksus su metalais sudarančius reagentus: gadolinio jonų šaltiniu naudojant Gd2O3 buvo gauti geresni rezultatai nei naudojant Gd(NO3)3•6H2O, vienfazis GdAlO3 gali būti sėkmingai susintetintas kompleksus sudarančiu reagentu naudojant tiek natūralią vyno rūgštį, tiek 1,2 etandiolį, tiek citrinų rūgštį, tiek citrinų rūgšties ir etanolamino mišinį. Nustatyta, kad sintetinant stronciu pakeistus gadolinio aliuminatus Gd1–xSrxAlO3– (x = 0,10, 0,25, 0,50, 0,75), tinkamesnis gadolinio jonų šaltinis yra gadolinio oksidas nei gadolinio nitratas heksahidratas, kompleksus sudarantis reagentas – EDTA nei natūrali vyno rūgštis. Vienfazis perovskito struktūros stronciu pakeistas gadolinio aliuminatas Gd0,90Sr0,10AlO3– buvo susintetintas zolių-gelių metodu 1000 oC temperatūroje, gadolinio jonų šaltiniu naudojant Gd2O3, stroncio jonų šaltiniu – Sr(NO3)2, kompleksus sudarančiu reagentu – EDTA. Be to, 800 ºC iškaitinimo temperatūra yra per maža šiems junginiams sintetinti. Pirmą kartą pasiūlytas vandeninis zolių gelių metodas lantano ir gadolinio kobaltatams... [toliau žr. visą tekstą]
Liang, Xinxing. "Synthesis of perovskite nanocrystals and their applications in perovskite solar cells." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767584.
Full textČižauskaitė, Sigutė. "Perovskito struktūros aliuminatų ir kobaltatų sintezė zolių-gelių metodu." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20091202_112220-21150.
Full textIn the present thesis the reported results let us to conclude that the developed aqueous sol–gel procedure could be successfully used for the low-temperature synthesis of monophasic perovskite gadolinium aluminate ceramics. It was also demonstrated that the selection of raw materials for the sol–gel processing should be done with care. Monophasic perovskite structure gadolinium aluminate GdAlO3 has been synthesized by sol gel synthesis method at 1000 oC, using gadolinium oxide as gadolinium raw material and 1.2 ethanediol, natural tartaric acid, citric acid or mixture of citric acid and ethanolamine as complexing agent. According to the XRD results, the Gd2O3 instead of Gd(NO3)36H2O preferably should be used as starting material for the preparation of GdAlO3. Monophasic perovskite structure strontium substituted gadolinium aluminate Gd0.90Sr0.10AlO3– was synthesized by the same sol gel synthesis method at 1000 oC, using gadolinium oxide as gadolinium raw material, strontium nitrate as strontium ion source and EDTA as complexing agent. It was proved that better gadolinium ion source is gadolinium oxide than gadolinium nitate hexahydrate, better complexing agent – EDTA than natural tartaric acid in the synthesis of GdAlO3 and strontium substituted Gd1–xSrxAlO3– (x = 0.10, 0.25, 0.50, 0.75) samples. According to the XRD results, increasing amount of strontium reduces amount of peaks of perovskite structure gadolinium aluminate. Besides, 800 ºC temperature is too low for the... [to full text]
Husťák, Miroslav. "Vysoce porézní keramické oxidové materiály pro environmentální katalýzu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-449796.
Full textLiu, Tianyu. "Perovskite Solar Cells fabrication and Azobenzene Perovskite synthesis: a study in understanding organic-inorganic hybrid lead halide perovskite." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1576840261464488.
Full textBaker, Sara Jane. "Oxygen diffusion in natural and synthetic perovskites." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287878.
Full textTang, Yawei. "Synthesis and characterisation of iron-containing perovskites." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:993996ed-92ee-4ddf-963d-d98eafc99580.
Full textFrampton, Philip. "Synthesis and characterization of perovskite-related materials." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426404.
Full textWallace, Thomas Kerr. "The synthesis and characterisation of novel molybdenum double perovskites." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=225337.
Full textMoore, Caroline A. "Synthesis and characterisation of low-dimensional oxides." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289407.
Full textGurusinghe, Nicola Narmada Muthumanike. "Synthesis and characterisation of some layered and perovskite." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4052/.
Full textMcCabe, E. E. "Synthesis and characterisation of layered, perovskite-related materials." Thesis, Birmingham City University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539316.
Full textHoang, Minh Tam. "Metal halide perovskite nanocrystals: From synthesis to applications." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/227764/1/Minh%20Tam_Hoang_Thesis.pdf.
Full textNascimento, Cássia Costa. "Síntese de cerâmicas tipo perovskita com potencial uso em células solares." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/8819.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Visible light accounts for the biggest fraction of the solar irradiance. One of the strategies for achieving higher photovoltaic power conversion efficiency is the application of low band-gap materials (Eg ideal≈1.4 eV) capable of absorbing this fraction of the solar spectrum. Ferroelectric semiconductors have been studied in this field due to the above-bandgap generated photovoltages and their ferroelectric polarization-driven carrier separation. Ferroelectric oxides usually present wide bandgaps which allow the absorption of only 8-20% of the solar spectrum. However, the development of new ferroelectric materials, particularly KBNNO [KNbO3]0,9[BaNi0,5Nb0,5O3-δ ]0,1 (Eg = 1.39 eV) and KBiFe2O5 (Eg=1,60 eV), has encouraged the use of such materials in solar cells. Simple synthesis routes, with short steps, time and temperatures are essential for the future progress of the application of such ferroelectric oxides in solar cells. KBNNO and KBiFe2O5 require high crystallization temperatures, which reduce the number of potential substrates and electrode materials that could be used in devices, as polymer-based flexible ones. Obtaining this oxides in a high surface-area powder form might be a strategy to further incorporation in solar cells composed of low-temperature processing materials. This work reports for the first time synthesis of KBNNO and KBiFe2O5 by solution combustion (SCS). Characterization by WAXD, SEM, EDS, TG/DSC and Diffuse Reflectance UV-Vis Spectroscopy and dielectric constants indicates the success of the synthesis. The optical properties show the visible-light absorption contribution and band-gaps closer to the ideal magnitude for solar applications compared to the non doped materials. The SCS was shown as an effective route to obtaining the phase. Furthermore, it is possible to improve it in order to produce powders with smaller particle size and absent of secondary phases.
A luz visível representa a fração mais relevante da radiação solar. Desta maneira, busca-se empregar nas camadas ativas das células solares materiais com baixos band-gaps (Eg ideal ≈1,4 eV), capazes de absorver fótons nessa região do espectro. Semicondutores ferroelétricos com estrutura da perovskita ou estruturas relacionadas têm sido estudados nesse campo devido ao potencial de obtenção de voltagens superiores à magnitude de seus band-gaps e à contribuição na separação de portadores de cargas decorrente da polarização intrínseca presente nesses materiais. Óxidos ferroelétricos geralmente possuem Eg elevados (2,7-4 eV), permitindo o aproveitamento de somente 8-20% do espectro solar. No entanto, o desenvolvimento de novos semicondutores ferroelétricos, particularmente a KBNNO [KNbO3]0,9[BaNi0,5Nb0,5O3-δ ]0,1 (Eg=1,39 eV) e KBiFe2O5 (Eg=1,60 eV), tem encorajado a aplicação desses materiais em células solares. Rotas de síntese simples, com etapas, tempos e temperaturas reduzidas são essenciais para o progresso futuro da aplicação de tais óxidos ferroelétricos em células solares. A KBNNO e KBiFe2O5 cristalizam em temperaturas mais elevadas do que perovskitas orgânico-inorgânicas, o que reduz a possibilidade de fabricação de dispositivos na presença de substratos e eletrodos sensíveis à temperatura, como substratos poliméricos flexíveis. Assim, a obtenção desses óxidos na forma de pós de elevada área superficial pode ser uma estratégia para posterior incorporação em dispositivos contendo materiais processados a baixas temperaturas. Neste trabalho, reporta-se pela primeira vez a síntese da KBNNO e KBiFe2O5 por combustão em solução. Caracterizações por DRX, MEV, EDS, TG/DSC, Espectroscopia UV-Vis e constantes dielétricas indicam a obtenção das fases com sucesso. As propriedades ópticas confirmam contribuição na absorção da luz visível com respeito aos materiais não dopados, KNbO3 e BiFeO3. A síntese por combustão em solução se mostra efetiva para obtenção das fases, mas passível de melhorias para produção de pós com menor tamanho de partícula e sem a presença de fases secundárias.
CNPq: 155305/2014-0
Lufaso, Michael Wayne. "Perovskite Synthesis and Analysis Using Structure Prediction Diagnostic Software." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1039132858.
Full textBartoníčková, Eva. "Syntéza a analýza kompozitních oxidových keramik v přítomnosti nekonvenčních energetických polí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233312.
Full textMcClure, Eric Thomas. "Synthesis and Characterization of New Visible Light Absorbing, Lead-Free Halide Double Perovskite Semiconductors." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492431322941272.
Full textChakravorty, Ruma 1973. "Synthesis and sintering of nanostructured multicomponent perovskites." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9866.
Full textSher, Falak. "Synthesis and properties of magnetoresistive double perovskites." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614834.
Full textGuggilla, Srinivas. "Synthesis and characterization of Perovskite-related ionic and mixed ionic-electronic conductors /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Full textAkizuki, Yasuhide. "High-Pressure Synthesis and Properties of Novel Perovskite Oxides." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199319.
Full textKususe, Yoshiro. "Synthesis, Structure, and Properties of Eu2+-containing Perovskite Oxides." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199320.
Full textBos, J. W. G. "Synthesis, structures and properties of new double perovskite oxides." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596791.
Full textEl-Shinawi, Hany Zakaria Ibrahim. "Synthesis and characterization of cobalt-containing perovskite-type oxides." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/625/.
Full textRogers, Fiona Kate. "Combinatorial synthesis and high throughput screening of Perovskite Electrocatalysts." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/409725/.
Full textPorter, Spencer H. "Perovskite and Pyrochlore Tantalum Oxide Nitrides: Synthesis and Characterization." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332499280.
Full textGreul, Enrico [Verfasser], and Thomas [Akademischer Betreuer] Bein. "On the way to non-toxic and highly stable perovskite-based optoelectronics : synthesis and investigations of lead-free perovskites for photovoltaic applications / Enrico Greul ; Betreuer: Thomas Bein." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/119109815X/34.
Full textTang, Ya. "Studies on perovskite oxyhydrides: catalysis and hydride anion diffusion." Kyoto University, 2018. http://hdl.handle.net/2433/232484.
Full textChavez-Carvayar, Jose Alvaro. "Synthesis and characterisation of new calcium-ferrite based phases." Thesis, University of Aberdeen, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318281.
Full textTseggai, Mehreteab. "Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4826.
Full textSHAMSI, JAVAD. "Colloidal Synthesis of Lead Halide Perovskite Nanocrystals for Optoelectronic Application." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929994.
Full textAdkin, Josephine J. "The synthesis and characterisation of some hexagonal perovskites." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:9b339008-23e6-432f-ad59-b90a018c9740.
Full textGustin, Lea. "Synthesis and Topochemical Manipulation of New Layered Perovskites." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2149.
Full textJosepha, Elisha A. "Topochemical Manipulation of Layered Perovskites." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/464.
Full textGao, Weiran. "Synthesis and Quantification of Surface Reactivity on CsSnBr3 and Cs2TiBr6." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1322.
Full textBONOMI, SARA. "Perovskites for optoelectronic applications: new synthetic approaches and properties modulation routes." Doctoral thesis, Università degli studi di Pavia, 2022. http://hdl.handle.net/11571/1450823.
Full textChen, Chen. "Synthesis, structural and ferroelectric properties of perovskite-like layered structured materials." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9526.
Full textRen, Xiaolin. "Synthesis and characterisation of metal oxides and fluorinated perovskite-related oxides." Thesis, Open University, 2005. http://oro.open.ac.uk/54200/.
Full textChen, Wei-tin. "Synthesis, structural and property studies of bismuth containing perovskites." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3861.
Full textRawal, Ritesh. "Synthesis and characterisation of B-site deficient hexagonal perovskites." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445124.
Full textNavas, Pérez Carlos Justo 1971. "Synthesis, electrical conductivity and nonstoichiometry of dopped layered perovskites." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85242.
Full textWilliams, Anthony James. "Synthesis and neutron diffraction studies of manganese oxide perovskites." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615786.
Full textManjon, Sanz Alicia. "Synthesis, structure and properties of bismuth based electroceramic perovskites." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2011763/.
Full textMANFREDI, NORBERTO. "Synthesis and investigations of multifunctional organic molecules and materials for applications in the field of renewable energy." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/153280.
Full textIn this PhD project, we studied molecules and new materials for application in third generation solar cells and photocatalytic or photoelectrochemical production of H2. The first part of this work was focused on the study of DSSCs devices going to investigate new organic-based photosensitizers, some of them obtained from external collaborations, and several phenothiazine based dyes bearing different functionalization to modulate optical and photovoltaic properties either in presence of organic and water based electrolyte. Perovskite solar cells (PSC) have also been studied and a reliable fabrication procedure have been developed. A study of feasibility about integration in multi-junction devices with mc-Si have been done successfully. Several hydrazone-based hole transport materials have been synthesized and their optical and electrochemical properties have been investigated. The mobility of carriers of these new materials have been studied in organic field effect transistor and they have been employed in PSC devices. Dibranched phenothiazine based dyes, were tested as photosensitizers in the photocatalytic production of H2, in combination with a Pt/TiO2 catalyst. The optical and electrochemical properties of the dyes were investigated, showing that careful design of the new dyes afforded enhanced optical properties. In the H2 production over 20 h, the new sensitizers revealed improved stability after longer irradiation times and enhanced performances, in terms of H2 production rates and light-to-fuel efficiencies, which were for the first time associated with enhanced stability under photocatalytic production of H2 and the absence of critical dye degradation. Analogous phenothiazine dye has been functionalized with a peripheral glucose unit (PTZ-GLU) to bust its affinity to water and enhance dye-sensitized photogeneration of H2. Compared to the corresponding alkyl derivative, as well as the common hydrophilic triethylene glycol substitution (PTZ-TEG); PTZ-GLU performed twice more efficient than PTZ-TEG in the photogeneration of H2 in terms of evolved gas and turnover number. PTZ-GLU has been investigated in presence of properly designed glucose-based co-adsorbents (GLU) to promote beneficial directional interactions on the semiconductor catalytic surface and, access enhanced catalytic activity. We have demonstrated that the combined use of the glucose-based dye and co-adsorbent afforded enhanced photocatalytic H2. A series of carbazole-based dyes have been synthesized and used as photosensitizers in the photocatalytic H2 generation. Compared to the more commonly used PTZ dyes, the exploitation of the planar and sulfur-free carbazole scaffold allows a ligand-to-metal charge transfer (LMCT) visible light absorption, busting the H2 production. A preliminary study on p-type dyes for H2 production by photoelectrochemistry has begun with interesting results.
Blomdahl, Emil. "Synthesis and characterization of novel hybrid organic-inorganic materials." Thesis, KTH, Tillämpad fysikalisk kemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302288.
Full textThe demand for better and more sustainable material is increasing. More efficient materials will be needed to meet the growing global need. Hybrid organic-inorganic materials are one type of materials that have been of great interest recently, which can be described as a class of materials that mix organic and inorganic components. This thesis focused on hybrid organic-inorganic materials inspired by the classical perovskite crystal structure ABX3, where component A is an organic cation, component B is a divalent metal cation and component X is an anion. Hybrid organic-inorganic materials based on the classical perovskite structure may have various functional properties and may have a broad range of potential applications. Some examples of those properties as well as some and possible applications include good photoconductivity and power conversion efficiency for photovoltaic devices, excellent emission properties for light emitting diodes and tunable dielectric properties for electronic switches and sensors. The physical properties of the hybrid organic-inorganic material are determined by the crystal structure of the material, which in turn will be decided by the choice of components. With the many possible choices for organic and inorganic components, there is an opportunity to synthesize completely new hybrid organic-inorganic compounds that may display new or superior physical properties. Current hybrid organic-inorganic materials based on the perovskite crystal structure mainly use lead as the divalent metal, since it currently gives the best performance. The toxicity of lead is a major drawback for current lead-based hybrid organic-inorganic materials. The possibility to replace lead with another divalent metal has been explored during this project. For this thesis, the organic cation cyclohexylammonium (CHA) has been of focus as the organic component. The aim of this thesis was to design, synthesize and characterize novel hybrid organic-inorganic compounds. The hybrid organic-inorganic compounds CHAZnBr3 and (CHA)2ZnBr4 were synthesized for the first time, to the best of our knowledge, and will be the focus of this thesis. The two new hybrid organic-inorganic compounds were structurally characterized by X-ray Diffraction (XRD) and thermally characterized by Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The first compound, CHAZnBr3, could be determined to be orthorhombic at 298 K. The compound was found to be thermally stable up 490 K, and to undergo a phase transition at 445 K. The second compound, (CHA)2ZnBr4, could not be fully structurally solved at either 100 K or 298 K. The compound was found to be thermally stable up to 490 K, and to undergo a phase transition at 230 K. Further characterization will be needed to better understand the properties of these two compounds and their possible applications.
Pack, Maria Joyce. "Complex metal oxide materials : synthesis, structural characterisation and development of combined EXAFS and powder differaction analysis." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243098.
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