Construção e caracterização de célula solar tipo barreira Schottky CdTe/Al / Construction and caracterization of Schottky barrier solar cells CdTe/Al
Denis Rafael de Oliveira Pereira
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
In this work the techniques of hot wall epitaxy (HWE) and molecular beam epitaxy (MBE) on thin films of CdTe (cadmium telluride) were used in order to manufacture a prototype solar cell type Schottky barrier. The films were produced by evaporation of a solid alloy of CdTe, varying two parameters of deposition: the growth time and substrate temperature. In the manufacture the Schottky Barrier solar cells Al-CdTe, the CdTe film was grown on glass substrate coated with a layer of TO (tin oxide doped with fluorine - SnO2:F) and an evaporation system was used in the deposition of Al contacts. The films were characterized by several techniques including profilometry to measure the thickness, atomic force microscopy (AFM) for determining surface morphology and x-ray diffraction for crystalline properties. The prototypes of the solar cell were characterized by electrical measurements (IxV curve) with and without illumination. The results show a strong influence of substrate temperature and thickness on the properties of solar cells. It was observed that the increase of substrate temperature favors the increase of grain and the growth of films with better quality, resulting in devices with better features. In addition, thinner layers of CdTe cells also produce a higher short circuit current when illuminated. Although the cells produced showed very low efficiency, we believe that it is possible to improve manufacturing processes, achieving better efficiency.
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