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Listar por palabra clave "Semiconductors"

Mostrando ítems 1-20 de 20

Crystal Chemistry of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels under high pressure

Santamaría Pérez, David; Amboage, Mónica; Manjón Herrera, Francisco Javier; Errandonea, Daniel; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Mújica, Andrés; Radescu, Silvana; Ursaki, Veacheslav; Tinginyanu, Ivan (American Chemical Society, 2012-07-05)

We report X-ray diffraction measurements in CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature and high pressures. The pressure dependences of the structural parameters have been determined and compared to those ...
Development of a test automation framework for pre-certification of a coaxial cable communications standard for in-home applications

Muñoz Oliver, María Carmen (Universitat Politècnica de València, 2022-10-04)

[ES] MoCA, Multimedia over Coax Alliance, es un estándar de comunicaciones por cable coaxial cuya aplicación en el hogar se denomina MoCA Mesh. El producto candidato a obtener el sello de certificación de MoCA debe cumplir ...
Dye-sensitized solar cells made of titania nanoparticles structured into a mesoporous material

Aprile, Carmela; Teruel Biosca, Laura; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (NRC Research Press (Canadian Science Publishing), 2011-02)

Using cetyltrimethylammonium bromide as the structure-directing agent, titania nanoparticles (3–5 nm) were organized into a mesoporous material (8.6 nm average pore size and 99 m2/g). The textural and spatial structuring ...
Elaboración de capas delgadas semiconductoras basadas en óxidos metálicos utilizadas en células fotovoltaicas

Casas Jiménez, Esperanza (Universitat Politècnica de València, 2019-09-25)

[ES] El trabajo de fin de grado que se presenta se basa en la elaboración de capas finas utilizadas en células solares con alta eficiencia. Con ello se pretende obtener células solares eficientes y que sean más económicas ...
Electrochemical Deposition Mechanism for ZnO Nanorods: Diffusion Coefficient and Growth Models

Reyes Tolosa, María Dolores; Orozco Messana, Javier; Lima, A.N.C.; Camaratta, Rubens; Pascual Guillamón, Manuel; Hernández Fenollosa, María de los Ángeles (Electrochemical Society, 2011)

Fabrication of nanostructured ZnO thin films is a critical process for many applications based on semiconductor devices. So on understanding of the electrochemical deposition mechanism is also fundamental for knowing the ...
Harnessing Infrared Photons for Photoelectrochemical Hydrogen Generation. A PbS Quantum Dot Based "Quasi-Artificial Leaf"

Trevisan, Roberto; Rodenas, Pau; González-Pedro, Victoria; Sima, Cornelia; Sánchez, Rafael S.; Barea, Eva M.; Mora-Sero, Iván; Fabregat-Santiago, Francisco; Gimenez, Sixto (American Chemical Society, 2013-01-03)

[EN] Hydrogen generation by using quantum dot (QD) based heterostructures has emerged as a promising strategy to develop artificial photosynthesis devices. In the present study, we sensitize mesoporous TiO2 electrodes with ...
InBO3 and ScBO3 at high pressures: an ab initio study of elastic and thermodynamic properties

Gomis, O.; Ortiz, H. M.; Sans Tresserras, Juan Ángel; Manjón Herrera, Francisco Javier; Santamaría-Pérez, D.; Rodríguez-Hernández, P.; Muñoz, A. (Elsevier, 2016-11)

We have theoretically investigated the elastic properties of calcite-type orthoborates ABO(3) (A= Sc and In) at high pressure by means of ab initio total-energy calculations. From the elastic stiffness coefficients, we ...
Lattice dynamics study of HgGa2Se4 at high pressures

Vilaplana Cerda, Rosario Isabel; Gomis Hilario, Oscar; Manjón Herrera, Francisco Javier; Ortiz, H. M.; Pérez González, E.; López Solano, Javier; Rodríguez Hernández, Plácida; Múñoz, Alfonso; Errandonea, Daniel; Ursaki, V.; Tiginyanu, Ivan (American Chemical Society, 2013-08)

We report on Raman scattering measurements in mercury digallium selenide (HgGa2Se4) up to 25 GPa. We also performed, for the low-pressure defect-chalcopyrite structure, lattice-dynamics ab initio calculations at high ...
Microstructural evolution and optical properties of TiO2 synthesized by eggshellmembrane templating for DSSCs application

Camaratta, R.; Correia Lima, A.N.; Reyes Tolosa, María Dolores; Hernández Fenollosa, María de los Ángeles; Orozco Messana, Javier; Bergmann, C.P. (Elsevier, 2013)

[EN] This article presents the bio-inspired synthesis of TiO2 using eggshell membranes (ESM) as a biotemplate on which the crystals of TiO2 are nucleated and grown. The microstructure, phase transformations and optical ...
Open-Framework Chalcogenide Materials - from isolated clusters to highly ordered structures - and their photocalytic applications

Silva-Gaspar, Beatriz; Martinez-Franco, R.; Pirngruber, G.; Fécant, A.; DÍAZ MORALES, URBANO MANUEL; Corma Canós, Avelino (Elsevier, 2022-02-15)

[EN] Photocatalytic processes are regarded as a sustainable and environmental-friendly way to attenuate mankind's strong dependence on fossil fuels, which is the main responsable for high pollution levels in our planet. ...
Optical absorption of defect chalcopyrite and defect stannite ZnGa2Se4 under high pressure

Gomis, O.; Vilaplana Cerda, Rosario Isabel; Pérez-González, E.; Ruiz-Fuertes, J.; Rodríguez-Hernández, P.; Muñoz, A.; Errandonea, D.; Segura. A.; Santamaría-Pérez, D.; Alonso-Gutiérrez, P.; Sanjuan, M.L.; Tiginyanu, I.M.; Ursaki, V.V.; Manjón, Francisco-Javier (Elsevier, 2023-04-05)

[EN] Optical absorption measurements at high pressure have been performed in two phases of the ordered -vacancy compound (OVC) ZnGa2Se4: defect stannite (DS) and defect chalcopyrite (DC). The direct bandgap energy of both ...
Photocatalytic CO2 reduction using non-titanium metal oxides and sulfides

Navalón Oltra, Sergio; Dhakshinamoorthy, Amarajothi; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2013-04)

[EN] Titanium dioxide (TiO2) is by far the most widely used photocatalyst both for the degradation of pollutants and in the field of renewable energies for the production of solar fuels. However, TiO2 has strong limitations ...
Photocatalytic production of hydrogen from biomass-derived feedstocks

Puga, Alberto V. (Elsevier, 2016)

[EN] The application of photocatalysis for the utilisation of sunlight energy is intensely investigated in present times, particularly in prospect of generating solar fuels by hydrogen production or CO2 reduction processes ...
Retroceso en la digitalización debido al desabastecimiento de las materias primas

Mezquida Gorczynska, Natalia María (Universitat Politècnica de València, 2022-10-19)

[ES] El actual desabastecimiento en determinados productos está generando incertidumbre en el mercado internacional y entre los consumidores, sobre cómo se resolverá este acontecimiento. Por esta razón, el objetivo de TFG ...
Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics

Mora-Sero, Iván; Bertoluzzi, Luca; González-Pedro, Victoria; Gimenez, Sixto; Fabregat-Santiago, Francisco; Kemp, Kyle W.; Sargent, Edward H.; Bisquert, Juan (Nature Publishing Group, 2013-08)

[EN] Colloidal quantum dot solar cells achieve spectrally selective optical absorption in a thin layer of solution-processed, size-effect tuned, nanoparticles. The best devices built to date have relied heavily on drift-based ...
Solar-Assisted CO2 Methanation via Photocatalytic Sabatier Reaction by Calcined Titanium-based Organic Framework Supported RuOx Nanoparticles

Rueda-Navarro, Celia Maria; González-Fernández, Marta; Cabrero-Antonino, Maria; Amarajothi, Dhakshina Moorthy; Ferrer Ribera, Rosa Belén; Garcia-Baldovi, Hermenegildo; Navalón Oltra, Sergio (John Wiley & Sons, 2024-10)

[EN] CO2 reduction by sunlight under mild reaction conditions is a research area of increasing interest expected to favor decarbonization and produce fuels and chemicals in the circular economy. We hereby report on the ...
Structural and elastic properties of defect chalcopyrite HgGa2S4 under high pressure

Gomis Hilario, Oscar; Santamaría-Pérez, D.; Vilaplana Cerda, Rosario Isabel; Luna Molina, Ramón; Sans, J. A.; Manjón Herrera, Francisco Javier; Errandonea, D.; Pérez-González, E.; Rodríguez-Hernández, P.; Muñoz, A.; Tiginyanu, I. M.; Ursaki, V. V. (Elsevier, 2014-01-15)

In this work, we focus on the study of the structural and elastic properties of mercury digallium sulfide (HgGa2S4) at high pressures. This compound belongs to the family of AB(2)X(4) ordered-vacancy compounds and exhibits ...
Thermally-activated cation ordering in ZnGa2Se4 single crystals studied by Raman scattering, optical absorption, and ab initio calculations

Vilaplana Cerda, Rosario Isabel; Gomis Hilario, Oscar; Pérez-González, E.; Ortiz, H. M.; Manjón Herrera, Francisco Javier; Rodríguez-Hernández, P.; Muñoz, A.; Alonso-Gutiérrez, P.; Sanjuán, M. L.; Ursaki, V. V.; Tiginyanu, I. M. (IOP Publishing: Hybrid Open Access, 2013-04-24)

Order-disorder phase transitions induced by thermal annealing have been studied in the ordered-vacancy compound ZnGa2Se4 by means of Raman scattering and optical absorption measurements. The partially disordered as-grown ...
Trapping of three-dimensional electrons and transition to two-dimensional transport in the three-dimensional topological insulator Bi2Se3 under high pressure

Segura, A.; Panchal, V.; Sánchez-Royo, J. F.; Marín-Borrás, V.; Muñoz-Sanjosé, V.; Rodríguez-Hernández, P.; Muñoz, A.; Pérez-González, E.; Manjón Herrera, Francisco Javier; González, J. (American Physical Society, 2012-05-24)

[EN] This paper reports an experimental and theoretical investigation on the electronic structure of bismuth selenide (Bi2Se3) up to 9 GPa. The optical gap of Bi2Se3 increases from 0.17 eV at ambient pressure to 0.45 eV ...
Visible-ligth photocatalytic conversions of carbon monoxide to methane by nickel (II) oxide

Sastre Calabuig, Francesc; Corma Canós, Avelino; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2013-12-02)

Solar Fuels: Different n- and p-type semiconductors have been investigated for sustainable solar fuel production. p-Type semiconductors, such as NiO, Fe3O4, Co3O4, and CuO, are able to reduce carbon monoxide by water or ...