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39 results on '"Riveros, Gonzalo"'

6. Characterizing the Hexagonality of Anodic Aluminium Oxide Nanoporous Arrays

Author

Costa, Luciano da Fontoura, Riveros, Gonzalo, Gomes, Humberto, Cortes, Andrea, Gilles, Maxime, Dalchiele, Enrique A., and Marotti, Ricardo E.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Nanoporous anodized alumina oxide have been used as templates for obtaining nanomaterials such as nanowires, which exhibit interesting electronic, magnetic and optical properties. This article presents how the regularity of the spatial distribution of pores in such templates, which affects several of the physical properties of the obtained nanomaterials, has been objectively quantified. The method uses adaptive thresholding, wave propagation image analysis methods, as well as an hexagonality measurement which was found to be particularly suitable because of its locality and invariance to translation, rotation and scaling. A comparison between commercial and laboratory-made samples is presented in order to test the method, resulting higher hexagonality for the latter type of templates., Comment: 12 pages, 2 figures. The following article has been submitted to Applied Physics Letters. If it is published, it will be found online at http://apl.aip.org/

Published
2005

14. Photophysical and Photoelectrochemical Properties of CsPbBr 3 Films Grown by Electrochemically Assisted Deposition

Author

Gau, Daniel L., primary, Ramírez, Daniel, additional, Iikawa, Fernando, additional, Riveros, Gonzalo, additional, Díaz, Patricia, additional, Verdugo, Javier, additional, Núñez, Gerard, additional, Lizama, Susy, additional, Lazo, Pamela, additional, Dalchiele, Enrique A., additional, Contreras, Lidia, additional, Idigoras, Jesús, additional, Anta, Juan, additional, and Marotti, Ricardo E., additional

Published
2022
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17. Electrochemically Assisted Growth of CsPbBr 3 ‐Based Solar Cells Without Selective Contacts

Author

Ramírez, Daniel, primary, Riveros, Gonzalo, additional, Díaz, Patricia, additional, Verdugo, Javier, additional, Núñez, Gerard, additional, Lizama, Susy, additional, Lazo, Pamela, additional, Dalchiele, Enrique A., additional, Gau, Daniel L., additional, Marotti, Ricardo E., additional, Anta, Juan A., additional, Contreras‐Bernal, Lidia, additional, Riquelme, Antonio, additional, and Idigoras, Jesús, additional

Published
2020
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20. Electrochemically Assisted Growth of CsPbBr3‐Based Solar Cells Without Selective Contacts.

Author

Ramírez, Daniel, Riveros, Gonzalo, Díaz, Patricia, Verdugo, Javier, Núñez, Gerard, Lizama, Susy, Lazo, Pamela, Dalchiele, Enrique A., Gau, Daniel L., Marotti, Ricardo E., Anta, Juan A., Contreras‐Bernal, Lidia, Riquelme, Antonio, and Idigoras, Jesús

Subjects
SOLAR cells, SILICON solar cells, OPEN-circuit voltage, METAL coating, DYE-sensitized solar cells, PROTHROMBIN, ELECTROPLATING
Abstract

In this work we report a simple and cost‐effective CsPbBr3‐based solar cell without ordinary selective contacts. To do so we follow an electrochemical approach consisting of three successive steps: (1) electrodeposition of PbO2 directly on top of FTO substrates, (2) heterogeneous phase reaction with gaseous HBr and (3) spin‐coating of methanolic CsBr solutions followed by annealing. This method is more adequate for large‐scale environmentally friendly production as it reduces chemical waste, particularly toxic lead. The resulting films were structurally and optically characterized showing good coverage of the FTO substrates, absence of defects such as pinholes and orthorhombic structure. Photovoltaic and impedance characterization was carried out by pressing a carbon coated metal spring onto the CsPbBr3 film until obtaining maximized open‐circuit potential (Voc) and short‐circuit photocurrent density (jsc) under simulated sunlight. The stabilized current at fixed voltage (SCFV) technique gave a maximum PCE value of 2.70 % close to devices with similar configuration. Impedance measurements demonstrated analogous behavior to that of state‐of‐art CsPbBr3 based solar cells, comprising a recombination arc at mid‐high frequencies, geometrical capacitance and ideality factors closed to 2, typical of SRH recombination in the perovskite bulk. [ABSTRACT FROM AUTHOR]

Published
2020
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26. Presentación digital de apoyo en la exportación de caracoles chilenos Tesis

Author

Vigorena Riveros, Gonzalo and Cáceres, Guillermo

Subjects
Aspectos Sociales, Diseño Gráfico, Caracoles, Promoción
Abstract

Tesis (Diseñador Gráfico) La exportación de caracoles de tierra cuyo nombre científico es (Helix Aspersa) se ha vuelto un negocio cada vez más rentable sobre todo para nuestro país que posee las condiciones climáticas óptimas para el cultivo, y la crianza del caracol puesto que en la época de alto consumo en Europa que es en verano, aquí en Chile( invierno) en ese periodo se está cultivando el caracol, por lo tanto al acabarse la cosecha de consumo en Europa nosotros les ofrecemos nuestra cosecha de caracoles ( de diciembre hasta abril) El consumo del caracol de tierra en Europa asciende a casi 40 000 toneladas anuales. No existen canales de difusión apropiados para ofrecer el producto, que den a conocer sus características, procedencia y formas de cultivo, y que potencien, la comercialización al exterior.

Published
2004

38. Morphological, structural, and photoelectrochemical characterization of n-type Cu2O thin films obtained by electrodeposition.

Author

Grez, Paula, Herrera, Francisco, Riveros, Gonzalo, Ramírez, Andrés, Henríquez, Rodrigo, Dalchiele, Enrique, and Schrebler, Ricardo

Abstract

Thin films of copper(I) oxide (Cu2O) were electrodeposited on fluorine-doped tin oxide predeposited glass substrates, by reduction of Cu2+ from Cu(II) acetate acid aqueous solutions. The Cu2O was potentiostatically grown at a potential value of −0.450 V (vs. SMSE) at 70 °C. The Cu2O thin films were characterized by means of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), optical transmission, electrochemical impedance spectroscopy, and photoelectrochemical experiments. Through these techniques, it was possible to establish the cubic Cu2O phase with a high crystallinity and a strong preferential growth along the [200] and [220] directions. Cu2O thin films show oxygen vacancies with formation of a nonstoichiometric compound with the presence of Cu(0) in the crystal lattice as determined by XPS analysis. In addition, Cu2O was used as the photoanode for the I− oxidation reaction when the system was illuminated ( Φ0 = 50.0 mW cm−2). The films exhibited a clear n-type semiconductor behavior, which was in agreement with the Mott-Schottky results. This behavior was explained by considering the nonstoichiometry of the oxide. [ABSTRACT FROM AUTHOR]

Published
2012
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39. Electrodeposition and Characterization of Hematite Films Obtained from DMSO Solution

Author

Riveros, Gonzalo, Ramírez, Daniel Luis, Dalchiele, Enrique A., Marotti, Ricardo, Peter, Laurie M., Grez, Paula, Martín, Francisco, and Ramos-Barrado, José-Ramón

Abstract

The present study shows the results obtained in the electrodeposition of hematite thin films from DMSO solution employing FeCl3and molecular oxygen as precursors. The films were obtained through a potential cycling program at different cathodic limits and at different electrolytic bath temperatures. In all cases, as-grown films were amorphous and photoelectrochemically inactive. An annealing procedure is necessary to completely transform the electrodeposited iron oxide to a-Fe2O3phase. XRD analyses confirm the presence of diffraction peaks corresponding to hematite after annealing, showing a strong preferential orientation of the [110] axis vertical to the substrate. Different techniques (XRD techniques, XPS analyses, SEM images, UV-Vis spectroscopy, Mott-Schottky plots and photocurrent – potential curves) have been employed in order to characterize the films and determinate their properties according with the conditions of electrodeposition and the annealing temperature.

Published
2013
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