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We analyzed the degradation of dye-sensitized solar cells, subjected to thermal, electrical, and illumination stress, using DC characterization, electrochemical impedance spectroscopy, and UV/VIS spectroscopy. We separated and identified the effects of each stress: temperature mostly affects the dye, UV light mostly degrades the electrolyte and leads to a sudden collapse of the dye, the current flow...
In this work, we have characterized single nickel metal hydride (NiMH) cells with Electrochemical Impedance Spectroscopy (EIS) technique to determine online the state of the batteries. Studying the variations of the obtained impedance spectra at specific frequencies, which correspond to part of the spectra that change mostly during the charge and discharge processes of the batteries, we have constructed...
Vacuum devices, such as TWTs and BWOs, for THz regime, represent a new challenge in vacuum electronics. Structures with dimensions in the range of microns are required to optimize the energy transfer from an electron beam to the RF field. The availability of codes to accurately analyze micro slow-wave structures at THz frequency is fundamental for a reliable and fast design. A procedure to design...
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