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      Propiedades estructurales, ópticas y eléctricas de películas de SnO<bold>2</bold> y SnO<bold>2</bold>:F depositadas por rocío pirolítico ultrasónico

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          Abstract

          <p>En esta investigación, reportamos la preparación y caracterización de películas delgadas de SnO<sub>2</sub> preparadas por la técnica de Rocío Pirolítico Ultrasónico con diferente contenido de flúor disuelto en etanol como solución precursora, para su posible aplicación como TCO´s. Las propiedades estructurales, ópticas y eléctricas de películas SnO<sub>2</sub>:F sintetizadas se caracterizaron mediante Difracción de Rayos-X (DRX), Perfilometria, Espectroscopia UV-Vis-NIR y mediciones eléctricas por Efecto Hall. Asimismo los cambios estructurales se estudiaron mediante Difracción de Rayos-X. Los principales resultados muestran que la resistividad eléctrica de las películas disminuyó con el contenido de flúor. Las mejores propiedades electro-ópticas (resistividad eléctrica de 4.14x10<sup>-4</sup> Ω-cm y transmitancia media de 80 %) se alcanzaron en un contenido de flúor con relación de estaño de aproximadamente 0.52. Además, se observó un cambio sistemático en la intensidad de las líneas de los máximos de difracción de rayos-X en función del contenido de flúor.</p>

          Translated abstract

          <p>In this research, we report the preparation and characterization of SnO<sub>2</sub> thin films preparation by the Ultrasonic Spray Pyrolysis technique using different fluorine content dissolved in ethanol as precursor solution, for its possible application as TCO´s. The structural, optical and electric properties of synthesized SnO<sub>2</sub>:F films have been characterized by X-ray Diffraction (XRD), Profilometer, UV-Vis-NIR spectroscopy and electrical measurements by Hall Effect. Also structural changes were studied by X-ray diffraction. The main results show that the electrical resistivity of the films decreased with the fluorine content. The best electro-optical properties (electrical resistivity of 4.14x10<sup>−4</sup> Ω-cm and average transmittance of 80 %) were achieved in a fluorine content in relative with tin of about 0.52. Furthermore, a systematic change was observed in the intensity of the lines of the diffraction maxima of X-rays in function of fluorine content.</p>

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          Conditions for the growth of smooth La0.7Sr0.3MnO3 thin films by pulsed electron ablation

          We report on the optimisation of the growth conditions of manganite La0.7Sr0.3MnO3 (LSMO) thin films prepared by Channel Spark Ablation (CSA). CSA belongs to pulsed electron deposition methods and its energetic and deposition parameters are quite similar to those of pulsed laser deposition. The method has been already proven to provide manganite films with good magnetic properties, but the films were generally relatively rough (a few nm coarseness). Here we show that increasing the oxygen deposition pressure with respect to previously used regimes, reduces the surface roughness down to unit cell size while maintaining a robust magnetism. We analyse in detail the effect of other deposition parameters, like accelerating voltage, discharging energy, and temperature and provide on this basis a set of optimal conditions for the growth of atomically flat films. The thicknesses for which atomically flat surface was achieved is as high as about 10-20 nm, corresponding to films with room temperature magnetism. We believe such magnetic layers represent appealing and suitable electrodes for various spintronic devices.
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            Automated electron diffraction tomography - a new tool for nano crystal structure analysis

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              III–V compound semiconductor transistors—from planar to nanowire structures

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                Author and article information

                Journal
                sv
                Superficies y vacío
                Superf. vacío
                Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. (México, DF, Mexico )
                1665-3521
                2014
                : 27
                : 4
                : 126-132
                Affiliations
                [1] orgnameBenemérita Universidad Autónoma de Puebla orgdiv1ICUAP orgdiv2CIDS Mexico
                [4] Belgrade orgnameSerbian Academy of Sciences and Arts orgdiv1Institute of Technical Sciences Serbia
                [2] Madrid Madrid orgnameUniversidad Complutense de Madrid orgdiv1CSIC orgdiv2Instituto de Geociencias Spain
                [3] Madrid Madrid orgnameUniversidad Carlos III de Madrid orgdiv1IAAB orgdiv2Dept. of Materials Science and Engineering and Chemical Engineering Spain
                Article
                S1665-35212014000400126 S1665-3521(14)02700400126
                cf2319df-1bab-4ac6-8bd3-3e33c8c99349

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 40, Pages: 7
                Product

                SciELO Mexico


                Ultrasonic spray pyrolysis,TCO´s,SnO<sub>2</sub>:F,SnO<sub>2</sub>,Rocío pirolítico ultrasónico

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