Problem Analysis of Fabricated Monocrystalline Silicon Solar Cell in Bangladesh

Abstract

This paper discusses of the follow-up problem analysis of monocrystalline silicon solar cell fabricated in Bangladesh. For monocrystalline solar cell fabrication one and only laboratory is available in Atomic Energy Research Establishment (AERE), Savar, Bangladesh. The fabricated silicon solar cells in this laboratory have the efficiency of only 6.89% so far. It is very important to identify the problems of fabrication to enhance the efficiency. Problems like wafer bowing has been observed and measurement shows the peak height of wafer bowing is 315 micrometer. Busbars and grid fingers of the fabricated solar cell have been compared with standard solar cells and result shows that the busbars and grid fingers are not straight and smooth as they should be. Furthermore, micro cracks and silver paste degradation have been found in busbars. Dektak 150 Surface Profiling System measurement shows more unevenness and less aspect ratio in the locally fabricated solar cells. Moreover, oxygen and nitrogen gas has not been used in metallization process during fabrication, which is one of the reasons for wafer bowing and micro cracks in busbars.