Abstract
The conventional solar cells have met their efficiency barrier at present and faced the mechanical problems when we use screen-printed process of back-side aluminum metallization. As the consequence, when we want to decrease cell thickness or use large-scale wafer for further reduction of fabrication cost of solar cells, this problem will be enlarged. Thus, we choose to use bifacial silicon nitride passivated screen-printed solar cells as the substitute structure which share almost the same fabrication process as the conventional one. Bifacial solar cells not only have none of the disadvantages mentioned above but can be applied to a variety of concentrated modules, so they show the promising potential to be the major products in the future. Due to many processing parameters in solar cell fabrication, we want to derive a complete analysis by simulation first. We use Sentaurus TCAD to simulate the performance of the cells and obtain the front limiting efficiency of 20.1% and back efficiency of 19.5% under the optimized metal coverage of 5.59%. In addition, the implementation of selective BSF can further improve front efficiency to 20.3% and back efficiency to 19.9%