Estudo de filme de EVA com partículas do vidro aluminossilicato de cálcio codopado com íons de neodímio e itérbio depositado em células solares de silício de alto desempenho

Abstract

Over the last few years, climate change has become a worldwide concern. The search for clean and efficient energy production has become a global goal. From this perspective, photovoltaic solar energy has presented itself as a great solution. Currently, the solar energy market is more than 90% composed of crystalline silicon solar cell technologies. Crystalline silicon solar cells have a theoretical limitation in efficiency due mainly to the spectral mismatch between the cell response and the sunlight spectrum. A number of techniques has been studied with the objective of developing new solar cell technologies or to develop mechanisms to improve existing technologies, such as the use of spectral converters. Therefore, in order to improve the efficiency, this work aims to study the use of aluminosilicate glass particles codoped with neodymium and ytterbium ions as a cover layer in crystalline silicon solar cells. Two pairs of prototypes were produced, one with the cells encapsulated with EVA film and the other with the cells with a layer of grains of the glassy material and the EVA encapsulation. Verification that the glassy material adhered to the surface of the solar cell was done with Raman spectroscopy. An experimental setup was developed to automatically obtain the I-V and P-V curves of the prototypes. The results showed that the solar cells with the glassy material incorporated presented relative efficiencies up to 5,38% compared to the cells encapsulated only with the EVA film and also presented improvements in all the electrical parameters such as maximum power, short circuit current, open circuit voltage and fill factor.