Akos Nemcsics, College of Engineering Budapest, Tavaszmezo str. 17, H-1084 Budapest, Hungary and Research Institute for Technical Physics and Materials Science, P. O.Box 49, H-1525 Budapest, Hungary, e-mail: nemcsics. akos@kvk. bmf. hu

The problem of electrical energy storage possible can be solved with the help of electrochemical solar cell, which is suitable to generate either electrical energy or hydrogen under special condition. The greatest problem of the electrochemical solar cell technology is the find for novel materials with appropriate properties for electrochemical energy conversion. In this work will be presented Cd4GeSe6 which is a novel material for purpose of electrochemical solar cell.

Some Aspects to Electrochemical Solar Cell

Solar cell technology is a very developed area of the microelectronics where are still some researched problems. 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 [1]. The technology of electrochemical solar cells have some technical and scientific problems. One such problem is the solution of the photo corrosion, which occurs at the electrolyte — semiconductor interface. The photo corrosion 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 Cd4GeSe6.

In this work will be presented Cd4GeSe6 which is a novel material for purpose of electrochemical solar cell. The properties of this material are investigated, which has been a scarcely studied material whose properties are not known in detail. Cd4GeSe6 belongs to the agryrodite family where lattice parameters are determined [2]. The band gap and type of band transition was deterimined by absorption and also from — V characteristics determined by photoelectrochemical method [3]. Furthermore were found that this material shows very good resistivity against photocorrosion [4]. The electrical parameters of the Cd4GeSe6- electrolyte junction are very important to know for solar cell application which are also determined in this work. The properties of the Cd4GeSe6 crystal — electrolyte junction are investigated with impedance analysis. The evaluation of the measured data was carried out with the help of a computer program developed by us in pascal language. We used an equalent circuit with physical meaning which is appropriate for the calculation [5].