Industrial development of silicon hetero-junction back contact solar cells

Silicon hetero-junction (SHJ) with the a-Si:H/c-Si structure is one of the candidates for high efficiency solar cells. Despite SHJ solar cells show more than 22% efficiency, SHJ solar cells are limited by optical losses on the front surface. To overcome these limitations, silicon hetero-junction back contact (HBC) solar cells are suggested. HBC solar cells combined the advantages of silicon hetero-junction (SHJ) and Interdigitated Back Contact (IBC) solar cells. In this study, HBC solar cell structures were designed by simulation methods and optimized fabrication processes for industrial application. Dimensions of back contact patterns were design by TCAD ATLAS software. Based on simulation results, p-type and n-type back contact patterns were fabricated.