Examinando por Autor "Galagan, Yulia"

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High stable CsFAPbIBr perovskite solar cells with dominant bulk recombination at real operating temperatures
(Royal Society of Chemistry, 2023-05-02) Romero, Beatriz; Delgado, silvia; Glowienka; Chang, Cheng-Tsung; del Pozo, Gonzalo; Arredondo, Belén; Martin-Martin, Diego; Contreras, Pedro; Galagan, Yulia
Mixed-cation mixed-halide perovskite solar cells have been characterized in DC at different temperatures (from -20 degrees C up to 50 degrees C) and the time evolution of the device efficiency has been assessed using different degradation protocols (indoors and outdoors). The completely planar p-i-n structure is ITO/CuNiOx/PTAA/CsFAPbIBr/PCBM/PEI/Ag. Pristine current-voltage characteristics barely show hysteresis, at any temperature. Open circuit voltage decreases with temperature at a rate of -1.5 mV degrees C-1, and the obtained PCE temperature coefficient is lower than -0.001% K-1, which is an outstanding value for this emerging photovoltaic technology. Cells have been degraded under different protocols: indoors using different light/dark cycles and outdoors in a high temperature and high irradiation location. Cells show no significant decrease of the efficiency after more than 350 h of indoor light cycling and the estimated T-80 obtained for the sample degraded outdoors under high irradiation and high temperature conditions is similar to 15 days.
Visible Light Communication system using an organic emitter and a perovskite photodetector
(Elsevier, 2019-10-01) Lopez-Fraguas, Eduardo; Arredondo, Belén; Vega-Colado, Cesar; del Pozo, Gonzalo; Najafi, Mehrdad; Martin-Martin, Diego; Galagan, Yulia; Sanchez-Pena, José Manuel; Vergaz, Rcardo; Romero, Beatriz
The past few years have seen a great increase in the development of Visible Light Communication systems (VLC), mainly triggered by the wide variety of situations they can be used in. These communication systems have traditionally employed inorganic light emitters and photodetectors. In this work, we present a VLC system using an organic emitter and a perovskite photodetector, both fabricated using low cost processing techniques. Perovskite devices have been widely studied as photovoltaics cells since they have achieved great efficiencies, and, in the recent years, there is also an intense research of these devices as photodetectors. In this work, we have fabricated and characterized a perovskite photodetector with layer structure ITO/PTAA/Perovskite/PCBM/ BCP/Cu, and integrated it in a visible communication system to successfully link an audio signal.