C. A. Arredondo

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In this work In(O,OH)S thin films were deposited on AgInS2 thin films for the system absorbent-layer/buffer-layer to be used in two junctions tandem and/or in single junction solar cells. AgInS2 layers were grown by co-evaporation from metal precursors in a two stage process, and In(O,OH)S thin films were deposited by chemical bath deposition. X-ray(More)
In this work is introduced a system for monitoring the performance of PV power plants using the virtual instrumentation concept. It will use a hardware based on the National Instruments SCXI system and as software the Lab VIEW graphical programming package. The equipment is capable of real time signal measuring giving information about the performance of(More)
This paper describes the design process and implementation of a two-axis sun tracker prototype for solar modules positioning by sensing the point of maximum brightness of the sky with the building of a sensor based on a geodesic dome and using a structure motion on horizontal celestial coordinates. The developed prototype system performs a continuous(More)
In this work, special emphasis was dedicated to find conditions to grow AgInSe<inf>2</inf> thin films with chalcopyrite type tetragonal structure using a procedure based on the co-evaporation of the precursors in a two stage process. Through a parameter study a set of synthesis parameters was found, which allowed us to grow thin films in the(More)
AgInS<inf>2</inf> (AIS) thin films with chalcopyrite type tetragonal structure were grown using a procedure based on the co-evaporation of their precursors in a two stage process. The effect of the evaporated mass of Ag to evaporated mass of In (m<inf>Ag</inf>/m<inf>In</inf>) ratio on the electrical transport properties was investigated through temperature(More)
This paper shows the comparison of two grid connected photovoltaic systems GCPVS that are operating in the city of Bogota&#x0301; - Colombia for more than three years. The systems are constituted by one of 0.8 kWp and the other of 3.6 kWp, they were designed with different dimensioning factor FD. The results revealed that the systems has different(More)
The purpose of this work is to introduce a novel system developed to be used as back-up of a conventional UPS, in order to increase its autonomy and to warrant continue operation for long periods of time in the case of a power failure in the public grid. The system is constituted by a conventional UPS connected in parallel to a standalone PV system and a(More)
AgInSe<inf>2</inf> (AISe) thin films grown with chalcopyrite type tetragonal structure using a procedure based on the co-evaporation of their precursors in a two stage process, were electrically and morphologically characterized. The effect of the evaporated mass of Ag to evaporated mass of In (m<inf>Ag</inf>/m<inf>In</inf>) ratio on the electrical and(More)
In Colombia, Law 1715/2014 addresses the issue of non-conventional renewable energy sources. It identifies them and defines its promotion and use, but dont limit the renewable sources to the ones mentioned in the law, but instead in a given moment it is possible to consider different sources of generation. It additionally establishes what tools are more(More)
This paper briefly describes the operation curves of some PV modules under actual irradiance conditions and temperature in 10 Colombian cities. Those curves were obtained from a Virtual Instrument (VI) developed in LabVIEW<sup>&#x00AE;</sup>. With the collected information from the VI, the cities were classified taking into account 5 parameters: solar(More)