Building of our solar cell related laboratory in the College was begun some years ago. One of the basic of our laboratory is a complete photovoltaic system. The system
contains 8 modules amorphous silicon based solar cells. The modules are type DS40 maden by Dunasolar [8]. The modules are mounted on the roof of the College. Different sensors such as for temperature and radiation measurement are attached to the holder of the modules. The indoor module of the photovoltaic system was installed in the laboratory. We have a 220 V AC inverter, a battery charger and batteries. The electrical energy made by solar cells serves for local lighting and the energy source serves for a computer. We utilize the electrical energy made by solar cells an indoor green house. The green house is equipped with artifical lighting and its work is controlled with the help of temperature and moisure sensors which have been designed by our students. We have some models for applications, especially for architectural applications [5].

We are dealing in laboratory work not only with practical questions but theoretical and experimental questions, too. We are dealing, for example, with the optical and electrical parameters of amorpous silicon thin layers and solar cells. Our other research is related tothe electrochemical solar cells. One of the greatest problems in the solar cell application is the storage of electrical enegy. This problem can possiby be solved with the help of electrochemical solar cells, which are suitable to generate either electrical energy or hydrogen under special conditions [3]. Hydrogen as energy carrier is very useful not only because the problem of storage of energy. Diminishing resources, more severe enviromental impacts and the ever-increasing demand for energy force us to reevaluate the structure of our energy supply system. Automobile and oil companies increasingly invest in hydrogen technology because it offers solutions to some of these concerns. This fascinating technology combines a sun energy supply with minimal impact on our natural resources. The technology of electrochemical solar cells have some technical and scientific problems. Such a problem is the solution of the photo corrosion, which occurs at the electrolyte / semiconductor interface [9]. The photocorrosion ruins the semiconductor electrode during the working of the solar cell. The possible direction of this research is the search for novel materials of appropriate properties for electrochemical applications. One of the important groups of such semiconductor compounds is the chalcogenides such as cadmium-germanium-selenide. This junction is investigated with impedance analysis among to others to research the charge transfer and the electrical parameters. The other task of the usage of photoelectrochemical solar cell is the conversion of hydrogen into electrical energy. We have a fuel cell for the different experiments.

The students study this project with enthusiasm and they often choose it as their thesis theme. Number of four to eight theses are made yearly in the topic of solar cells. An often used theme of thesis is planning a complette photovoltaic system for a real family house or other buildings. The students often deal with the compatibility of the photovoltaic with other electronic systems in their works. For example, a latest work which was presented also at a conference was dealing with solar cells in lighting technics[ 10]. Many works deal with the technological questions of solar cells.