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Dissertations / Theses on the topic 'Perovskite'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Bufaiçal, Leandro Félix de Sousa. "Propriedades estruturais, eletrônicas e magnéticas dos óxidos Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278527.

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Orientador: Pascoal José Giglio Pagliuso<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-15T19:42:04Z (GMT). No. of bitstreams: 1 Bufaical_LeandroFelixdeSousa_D.pdf: 2467040 bytes, checksum: 4460b75c04d570fb27584b7dfff2c5f3 (MD5) Previous issue date: 2010<br>Resumo: Há muitas décadas os óxidos de metais de transição são tema de grande interesse científico devido à grande variedade de propriedades físicas interessantes que apresentam, com suas possíveis aplicações tecnológicas. Mais recentemente, por exemplo, os
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2

Tanabe, Eurico Yuji. "\"Óxidos do tipo Perovskitas para reações de decomposição direta de NO e redução de NO com CO\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-16042007-111408/.

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Uma tecnologia importante para reduzir a quantidade de poluentes atmosféricos lançados na atmosfera, é a utilização de catalisadores, que convertem os gases altamente poluentes como o NO, para outros gases inofensivos ao meio ambiente. Neste trabalho, os óxidos do tipo perovskitas La2CuO4, LaNiO3, LaMnO3, La1,4Sr0,6CuO4, La0,7Sr0,3NiO3 e La0,7Sr0,3MnO3 foram preparados através do método da co-precipitação, caracterizados por difração de raios-X, redução a temperatura programada, fisissorção de nitrogênio e análise química, e, posteriormente avaliados frente as reações de redução de NO com CO,
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3

Ahchawarattaworn, Jutharat. "Perovskite oxynitride dielectrics." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1186.

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The synthesis, crystal structures and dielectric properties of perovskite oxynitrides of the type LnTiO2N (Ln = La, Nd and mixtures) and ATaO2N (A = Ca, Sr, Ba and mixtures), have been investigated. The end-member oxynitrides and their associated LaxNd1-xTiO2N, CaxSr1-xTaO2N and BaxSr1-xTaO2N solid solutions were successfully prepared by ammonolysis of the appropriate precursor oxides at temperatures in the range 900-1200ºC. The complete range of LaxNd1-xTiO2N solid solution are orthorhombic perovskites, which show a small increase in unit cell parameters with increasing La content across the
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4

Prasad, Bhagwati. "Perovskite spin filters." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709021.

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5

Stenberg, Jonas. "Perovskite solar cells." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-137302.

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Perovskite solar cells (PSC) performance has risen rapidly the last few years with the current record having power conversion efficiency (PCE) of 22.1 %. This has attracted a lot of attention towards this alternative solar cell that can be manufactured with less energy and toxic material than traditional silicon solar cells. The purpose of this thesis is to reproduce high performance PSC from known recipe by Zhang et al. with potential of PCE reaching above 18 %. The thesis covers the theory regarding how a PSC operates, how they are measured and which parameters are important for a high perfo
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6

Lukose, Rasuole. "Liquid-delivery metal-organic chemical vapour deposition of perovskites and perovskite-like compounds." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16278.

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Perowskite und Perowskit-artige Materialien sind von großem Interesse, da sie eine Vielzahl von strukturellen und physikalischen Eigenschaften haben, welche die Möglichkeit bieten, sie für unterschiedliche Anwendungen einzusetzen. Die Methode der Liquid-Delivery Metal Organic Chemical Vapour Deposition (LD-MOCVD) wurde gewählt, da sie eine gute Kontrolle über die Zusammensetzung ternärer Oxide und eine hohe Homogenität der Filme ermöglicht. Darüber hinaus können mit dieser Methode Filme hergestellt werden, die aus Elementen bestehen, für welche nur feste Precursor oder welche mit niedrigem D
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7

Liu, 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.

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8

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.

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Perovskite solar cells are a very promising photovoltaic technology which was first reported in 2009 and developed very rapidly. The crystallisation within perovskite films is highly dependent on processing environments, such as temperature, humidity, atmosphere, even light, which makes the fabrication of perovskite solar cells rather lab-dependent and poorly reproducible. One strategy to overcome this problem is to develop a controlled synthesis of perovskite nanocrystals which can then be ordered into films in a separatestep. In this thesis, optimisation of planar perovskite solar cells is c
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9

Yildirim, Ceren. "Using a perovskite oxide as interfacial layer for halide perovskite optoelectronics." Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0001.

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Les cellules photovoltaïques et les diodes électroluminescentes pérovskites requièrent des couches d'injection/extraction de charges, qui sont cruciales pour plusieurs processus importants régissant les performances et la durée de vie. Bien que des études intensives aient été consacrées au développement de couches interfaciales innovantes de type p, des matériaux présentant des propriétés hautement ajustables et une stabilité photochimique élevée restent très recherchés. Cette thèse explore l’utilisation d’oxydes pérovskites comme couches d’interface pour des applications optoélectroniques en
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10

Montero, Rama María Del Pilar. "TOWARD NANOSTRUCTURED PEROVSKITE SOLAR CELLS BASED ON NANOPOROUS ANODIC ALUMINA TECHNOLOGY." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670596.

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En aquesta tesi es planteja fabricar una cel·la solar nano-estructurada de perovskita utilitzant alúmina nano-porosa anoditzada (NAA en les seves sigles en anglès) com a suport. Es va escollir la perovskita perquè les cel·les solars d'aquest material han assolit una eficiència molt similar a les cel·les existents de silici. A més a més, són barates i fàcils de preparar. El fet que la cel·la estigui nano-estructurada aportarà estabilitat davant la radiació, la temperatura i la humitat, sent aquest el principal problema d'aquests dispositius. Els nano-porus de la NAA tenen una forma cilíndrica
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11

Watterud, Geir. "Determination of Oxygen Transport Coefficients in Perovskites and Perovskite related Materials with mixed Conductivity." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-698.

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<p>Perovskites and perovskite related materials are materials that are candidates for applications such as oxygen permeable membranes, cathodes for SOFC and high-temperature oxygen sensors. This arises from the potential high ionic conductivity and the chemical stability even at low partial pressures of oxygen. From an application point of view, it is important to have knowledge about the oxygen transport properties in these materials. Oxygen transport in mixed conducting oxides involves two inherently different processes; oxygen exchange between bulk gas and surface and solid state diffusion.
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12

Bett, Alexander Jürgen [Verfasser], and Stefan [Akademischer Betreuer] Glunz. "Perovskite silicon tandem solar cells : : two-terminal perovskite silicon tandem solar cells using optimized n-i-p perovskite solar cells." Freiburg : Universität, 2020. http://d-nb.info/1214179703/34.

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13

Wang, Hongzhi. "Perovskite based ceramic nanocomposites." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443007.

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14

Isaac, Stephen Paul. "Grain boundary perovskite devices." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604963.

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The perovskite family has many novel features including, in certain compounds, either high temperature superconductivity or colossal magnetoresistance (CMR). The electrical and magnetic properties of grain boundaries in these materials also have their own unique properties. These distinct characteristics can be exploited to make devices with a range of potential applications. In this thesis, two types of devices are presented. Superconducting grain boundaries have been studied extensively and can form Jospehson junctions. The grain boundaries have a reduced supercurrent but a substantially enh
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15

Cleaver, Patrick Joseph. "Electronic and Crystalline Characteristics of Mixed Metal Halide Perovskite Semiconductor Films." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1547412870005544.

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16

Schulze, Patricia S. C. [Verfasser], Harald [Akademischer Betreuer] Hillebrecht, and Stefan [Akademischer Betreuer] Glunz. "High band gap perovskite absorbers for application in monolithic perovskite silicon tandem solar cells." Freiburg : Universität, 2020. http://d-nb.info/122336612X/34.

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17

Syed, Ali Asgher. "Hole extraction layer/perovskite interfacial modification for high performing inverted planar perovskite solar cells." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/553.

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Organo-metallic halide perovskite solar cells (PSCs) are considered as a promising alternative photovoltaic technology due to the advantages of low-cost solution fabrication capability and high power conversion efficiency (PCE). PSCs can be made using a conventional (n-i-p) structure and an inverted (p-i-n) configuration. PCE of the conventional p-i-n type PSCs is slightly higher than that of the inverted n-i-p type PSCs. However, the TiO2 electron transporting layer adopted in the conventional PSCs is formed at a high sintering temperature of >450 °C. The TiO2 electron transporting layer limi
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18

Morelli, Marcio Raymundo. "Liquid phase sintering of perovskite." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297279.

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19

Copplestone, Francis A. "Catalytic studies of perovskite oxides." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358591.

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20

Pockett, Adam. "Characterization of perovskite solar cells." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715261.

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A range of electrical characterization techniques previously used for DSSC have been transferred to the study of planar perovskite devices. These include impedance spectroscopy (EIS), intensity modulated photovoltage spectroscopy (IMVS) and open-circuit voltage decay measurements (OCVD). An investigation into the observed response from these measurements has been carried out in order to gain a deeper understanding of device operation. Multiple processes with time constants on the microsecond, millisecond and second timescale were observed. The complimentary frequency and time domain techniques
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21

Wei, Rongsheng. "Modelling of perovskite solar cells." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/119218/1/Rongsheng_Wei_Thesis.pdf.

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This project focuses on simulation performance of perovskite solar cells using two models. One is a simplified model developed for perovskite absorber layer of PSCs by using matlab program to investigate the effect of density of state, relative dielectric permittivity and band gap energy of the perovskite material on the device performance. The other model is based on SCAPS to investigate the influence of hole mobility and band gap offset of different hole transport materials on device performance.
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22

Diab, Hiba. "Propriétés optiques des pérovskites hybrides 3D pour le photovoltaique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN061/document.

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Depuis 5 ans, les pérovskites hybrides organiques-inorganiques sont apparues comme une nouvelle classe de semiconducteurs possédant des propriétés optoélectroniques très intéressantes pour les dispositifs photovoltaïques et émetteurs de lumière. Cette thèse porte sur une étude expérimentale de spectroscopie optique, qui s’inscrit dans le champ d’exploration des propriétés optiques et des effets excitoniques des pérovskites hybrides CH3NH3PbX3 avec X = I ou Br. Nous avons étudié les propriétés optiques de couches minces déposées par spin-coating et de monocristaux élaborés en solution. Les couc
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23

Moghadamzadeh, Somayeh [Verfasser], and U. [Akademischer Betreuer] Lemmer. "Multi-Cation Perovskite Semiconductors for All-Perovskite Tandem Solar Cells / Somayeh Moghadamzadeh ; Betreuer: U. Lemmer." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1230475737/34.

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24

Kapusta, Bénédicte. "Étude des propriétés de transport des corps de structure perovskite : application à la perovskite MgSiO /." Saclay : Commissariat à l'énergie atomique, 1990. http://catalogue.bnf.fr/ark:/12148/cb351005625.

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25

Francisco, López Adrian. "Understanding the temperature and pressure dependence of the optoelectronic and structural properties of FAxMA1-xPbI3 perovskite solid solutions." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670182.

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Les perovskita orgàniques/inorgàniques híbrides han atret molta atenció des que es van introduir per primera vegada en un dispositiu fotovoltaic fa deu anys, obtenint una eficiència de el 3%. Des de llavors, l’eficiència de les cel·les solars de perovskita ha augmentat fins a gairebé igualar l’eficiència de les cel·les fotovoltaiques comercials de silici. A més, permet la fabricació de dispositius flexibles a un preu reduït. A causa de les seves propietats optoelectròniques excepcionalment bones, també s’està duent a terme una intensa recerca per trobar diferents aplicacions d’aquest tipus de
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26

Bufaiçal, Leandro Félix de Sousa. "Investigação das propriedades estruturais, eletrônicas e magnéticas dos óxidos com estrutura perovskita dupla Ca2-xLaxFeIrO6." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278507.

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Orientador: Pascoal Jose Giglio Pagliuso<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-10T19:13:39Z (GMT). No. of bitstreams: 1 Bufaical_LeandroFelixdeSousa_M.pdf: 1501359 bytes, checksum: 7c304c6377511ffd74495c952b919ec0 (MD5) Previous issue date: 2006<br>Resumo: Um grande número de óxidos de metais de transição se forma em estrutura perovskita simples ou em uma de suas variantes, e muitos deles apresentam propriedades físicas interessantes, como supercondutividade, magneto-resistência colossal e ferro
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Silva, Gabriel Magalhães e. "Sí­ntese e propriedades de cerâmicas de LaxSr1-xCryFe1-y(Mn1-y)O3-δ para aplicações em célula de combustí­vel e catalisadores." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19092018-155147/.

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O mundo moderno é extremamente dependente de combustíveis fósseis como fonte de energia primária e essa forte dependência leva a problemas políticos, econômicos e ambientais. Como possível solução a esses problemas tem-se as células combustíveis, pois são dispositivos que geram energia elétrica limpa diretamente de reações eletroquímicas produzindo, além da energia elétrica, apenas calor e água. Logo, percebe-se que essas células são fontes de energia confiáveis, renováveis e não poluentes, que contribuem para o desenvolvimento sustentável. Devido a isso, este trabalho teve como objetivo princ
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FU, QIANG FU. "POLYMER-TEMPLATED NUCLEATION AND CRYSTAL GROWTH OF PEROVSKITE FILM AND CONDUCTIVE IONOMER DOPED PEROVSKITE FILLM FOR HIGH PERFORMANCE OF ORGANIC-INORGANIC HYBRID PEROVSKITE SOLAR CELLS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495207539153854.

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29

Čižauskaitė, 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.

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In 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 ethano
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30

Hossain, Ihteaz Muhaimeen [Verfasser], and U. W. [Akademischer Betreuer] Paetzold. "Semitransparent perovskite solar cells for perovskite-based tandem photovoltaics / Ihteaz Muhaimeen Hossain ; Betreuer: U. W. Paetzold." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1230475745/34.

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31

KAPUSTA, PERNOT BENEDICTE. "Etude des proprietes de transport des corps de structure perovskite : application a la perovskite mgsio#3." Paris 7, 1990. http://www.theses.fr/1990PA077049.

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Notre etude experimentale de la perovskite kznf#3 montre que les valeurs de la conductivite electrique a haute temperature ne sont pas caracteristiques d'un electrolyte solide. Nous attribuons le transport ionique a la migration des lacunes de fluor creees par dissolution de l'oxygene dans le reseau. L'energie de migration de la lacune de fluor est d'environ 0,9 ev. Par une etude en dynamique moleculaire de la perovskite mgsio#3 nous mettons en evidence lors du chauffage a la pression constante de 310 kb, une transition de phase orthorhombique-quadratique, qui s'amorce a 2600 k. Cette transiti
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Brivio, Federico. "Atomistic modelling of perovskite solar cells." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698992.

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This thesis focuses on the study of hybrid perovskites properties for the purposes of photovoltaic applications. During the almost four years PhD project that has lead to this thesis the record photovoltaic efficiency for this technology has in- creased from 10.9% to 22.1%. Such a significant pace of development can be com- pared with few other materials. It is for this reason that hybrid perovsites have at- tracted impressive research efforts. We approached the study of such unique ma- terials using computational ab-initio techniques, and in particular Density Func- tional Theory. We consider
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33

Sullivan, Eirin Courtney. "Anion manipulation in perovskite-related materials." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/484/.

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Sr\(_2\)Co\(_2\)O\(_5\) with the perovskite-related brownmillerite structure has been synthesised via quenching, with the orthorhombic unit cell parameters \(a\) = 5.4639(3) Å, \(b\) = 15.6486(8) Å and \(c\) = 5.5667(3) Å based on refinement of NPD data collected at 4K. Electron microscopy revealed L R L R intralayer ordering of chain orientations which requires a doubling of the unit cell along the \(c\) parameter, consistent with the assignment of the space group \(Pcmb\). However, on the length scale pertinent to NPD, no long-range order is observed and the disordered space group \(Imma\) a
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Sun, Jingyu. "Carbon nanotube growth on perovskite substrates." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:2b77fe9b-7313-49b2-b490-70574b4af565.

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This thesis reports on the chemical vapour deposition (CVD) growth of carbon nanostructures (mainly carbon nanotubes (CNTs)) on perovskite oxide surfaces with the aid of various catalysts. Two types of perovskite oxide, single crystal SrTiO3 (001) and polycrystalline BaSrTiO<sub>3</sub>, have been used as catalyst supports (in metal-catalyst-involved CVD routes) or as catalysts (via metal-catalyst-free CVD routes) for the growth of carbon nanostructures. In metal-catalyst-involved cases, SrTiO<sub>3</sub> (001) single crystal has been proven, for the first time, to serve as a substrate for the
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Sutton, Rebecca J. "Towards stable perovskite materials for photovoltaics." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:4cc567a2-9c2f-44c8-9fdf-b2d0493683d3.

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This thesis explores a range of photoactive metal halide perovskite materials for use in photovoltaic applications. These materials are of huge interest due to their outstanding optoelectronic properties which result in high photovoltaic power conversion efficiencies. In particular, this thesis discusses perovskites with stoichiometry ABX<sub>3</sub> where A is a singly charged cation, for example methylammonium (MA), B is predominantly lead (Pb<sup>2+</sup>), and X is iodide (I-) and/or bromide (Br<sup>-</sup>). At present the commercial applications of these materials are limited by the chem
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Mkehlane, Moleko Samuel. "Electroanalysis of Organo-Chalcogenic Perovskite Nanomaterials." University of the Western Cape, 2017. http://hdl.handle.net/11394/6115.

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Magister Scientiae - MSc (Biotechnology)<br>Organometallic halide perovskite solar cells have developed as one of the most promising contenders for the production of solar cells. The generic perovskite (PS) structure ABX3 allows manufacturing a broad range of PS materials by simple modification of building blocks A, B, and X (A = organic group, B = metal, and X = halide). The preparation of a series of solution-processed solar cells based on methylammonium (MA) lead halide derivatives, CH3NH3PbX3 (X=Cl, Br, and I) has been reported. These solar cells showed tunable optical properties dep
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Logvinovich, Dmitry. "Anionic substitution in perovskite-type oxides." kostenfrei, 2008. http://d-nb.info/993937535/34.

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Kang, Jian. "Perovskite-inspired Bismuth-based Photovoltaic Devices." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/415825.

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Global energy consumption has gradually increased in the last few decades. Limited fossil fuels sources call for research on sustainable and renewable energy resources to meet future demand. The direct conversion of sunlight into electricity is one of the most promising ways to meet future energy demands with minimal environmental impacts. Solar technology provides an ecofriendly and renewable energy route to convert photon energy into electricity. Since 2009, metal halide perovskite solar cells have achieved the most notable progress in the field of photovoltaics with a certified power conver
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Jiménez, López Jesús. "Analysis of the Different Kinetic Processes in Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668405.

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L'energia fotovoltaica s'ha convertit en una de les alternatives més populars com a font d'energia renovable. Es basa en la transformació directa de radiació solar en electricitat. Es troba disponible a escala global i a més no necessita de cap transformador per convertir l'energia mecànica en energia elèctrica, el que fa que sigui fàcil d'implementar. Avui en dia, el material més utilitzat per a aplicacions fotovoltaiques segueix sent el silici. En canvi, el desenvolupament de noves tecnologies, més barates, fàcils de processar i que a més poden utilitzar-se en substrats flexibles, ha sor
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Almohareb, Muneerah. "Novel Lithium Ionic Conducting Perovskite Materials for Lithium-Air Batteries." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36515.

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Lithium Air (Li/O2) batteries are energy conversion devices that produce electricity from the oxidation of lithium metal at the anode and the reduction of molecular oxygen at the cathode. These batteries are considered as promising rechargeable cells for high power applications due to their high power density ranging from 1000 to 2000 Wh/kg. However, one of the most significant challenges is the need to separate the metallic lithium anode from any oxygen or water-containing environment while at the same time allowing fast and efficient lithium ion transport through the electrolyte. Therefore,
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41

Farhoudi, Mohammad Mehdi. "Studies of structures, transport and magnetic properties of doped novel three-dimensional perovskite compounds." Institute for Superconducting and Electronic Materials - Faculty of Engineering, 2009. http://ro.uow.edu.au/theses/3047.

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Perovskite oxide compounds have generated a great amount of interest over the past twenty years, as they exhibit exotic magnetic, electric, and magnetoelectric properties, which, apart from their intrinsic interest, would have a wide range of applications in industry, with special utilization in the engineering of data storage devices.Starting with a general definition of the perovskite structure of ABO3 materials, the magnetic and transport properties of cobalt and manganese based compounds are reviewed. The objective of this thesis is focused on the investigation of the structures, and the m
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42

Tanabe, Eurico Yuji. "Catalisadores de níquel e cobalto obtidos a partir de óxidos do tipo perovskita para reações de reforma a vapor de etanol." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-24032011-093816/.

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Neste trabalho foram avaliadas as atividades de catalisadores do tipo perovskita LaNi1-xCoxO3 frente à reação de reforma a vapor de etanol. Devido à baixa área superficial, característica de óxidos do tipo perovskita, esses foram suportados em SiO2, Al2O3 e ZrO2, a fim de verificar o efeito do suporte na atividade catalítica.<br /> Os catalisadores foram preparados pelo método da co-precipitação e caracterizados por espectrometria de emissão atômica por plasma induzido, difração de raios X pelo método do pó, adsorção de nitrogênio pelo método B.E.T, redução a temperatura programada e espectros
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43

Ribeiro, Guilherme Kubo. "Síntese e caracterização de materiais nanoestruturados luminescentes de composição CaTiO3:Pr,La,Al /." Rio Claro, 2019. http://hdl.handle.net/11449/183379.

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Orientador: Alexandre Mesquita<br>Resumo: O titanato de cálcio CaTiO3 é um material com estrutura de tipo perovskita que tem sido aplicado como luminóforo. É bem estabelecido que a inserção de íons de terra rara no sítio ocupado pelo Ca2+ provoca mudanças significativas nas suas propriedades estruturais e produz efeitos luminescentes na faixa do visível. Entretanto não existem trabalhos reportando a inserção do La3+ no sítio do Ca2+ no que se refere às características estruturais e luminescentes desses materiais. Portanto, o presente trabalho estuda as propriedades fotoluminescentes apresentad
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44

Tainter, Gregory Demaray. "Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/286026.

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Metal-halide perovskites show great promise as solution-processable semiconductors for efficient solar cells and LEDs. In particular, the diffusion range of photogenerated carriers is unexpectedly long and the luminescence yield is remarkably high. While much effort has been made to improve device performance, the barriers to improving charge transport and recombination properties remain unidentified. I first explore charge transport by investigating a back-contact architecture for measurement. In collaboration with the Snaith group at Oxford, we develop a new architecture to isolate charge ca
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45

Gelmetti, Ilario. "Advanced Characterization and Modelling of Charge Transfer in Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668085.

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Aquesta tesis inclou el treball fet en ICIQ sobre fabricació, caracterització, i modelització de cel·les solars de perovskita híbrida. Agafades des de la recerca en altres tipus de cel·les solars, les eines de anàlisi, les metodologies i, més important, la seva interpretació han sigut analitzades i adaptades a aquest nou tipus de dispositiu. Llavors, aquestes tècniques han sigut utilitzades per analitzar i entendre la influència de quatre diferents i nous transportadors de forats electrònics sobre el voltatge de cel·les de perovskita. Un altre estudi ha investigat la acumulació dels elec
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46

Johnsson, Peter. "Processing and Properties of Ultrathin Perovskite Manganites." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3511.

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47

Farrell, Shannon. "Crystallographic studies of selected perovskite-group compounds." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ33371.pdf.

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48

Noailles, Liam Dagme. "Chemistry and properties of complex Perovskite oxides." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249440.

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49

Frampton, Philip. "Synthesis and characterization of perovskite-related materials." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426404.

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50

Hassler, Julia. "Mesoporous metal oxides for perovskite solar cells." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-263064.

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