Silicio padėklų naudojamų foto-elementų gamyboje tyrimai ; Investigation Of Silicon Wafers Used In Photo-voltaic Manufacturing

In recent years there was an exploding rise in solar cell demand and manufacturing. The need for cheaper and more effective photovoltaic devices has led to a rise of increased funding for the development of these technologies. Polycrystalline silicon substrates have a major part in solar cell manufacturing and makes up more than 90 % of the market, also production of polycrystalline silicon wafers are the most expensive process in the photovoltaic manufacturing. This work circles around the concerns of silicon wafer quality. Photoluminescence imaging was used for wafer analysis. The object of this research was to compare polycrystalline silicon wafers processed in different age acidic solutions. It was shown that older solutions tend to leave more adsorbed impurities and crystallographic deformations. Adsorbed impurities were described using scanning electron microscopy and x-ray energy dispersion spectroscopy. The absorbed photoliuminescent impurities were shown to be high quantities of carbon, oxygen and chloride