Simulation of CZTS(Se)4 Tandem Solar Cells By AFORS-HET Software

In this work, solar cells were simulated single, mechanically and monolithically stacked based on the czts (se) 4 absorption layer, both layers of tandem solar cell were simulated using by afors-het software (one-dimensional ). electrical properties of the monolithical tandem cell, it's determined after the current matching to the top and bottom sub-cell. the short circuit current density jsc is about 23.9 ma. cm-2 when the top cell thickness is 384 nm in conjunction with the 1000 nm bottom cell thickness. the maximum efficiency obtained is approximately 23.1% with an open circuit voltage voc ~ 1146.9 mv. the efficiency of the mechanical tandem cell with series connection was 23.76 % at open circuit voltage voc ~ 1166.9 mv and the efficiency about 26.62 % at open circuit voltage voc ~ 475.2 mv for mechanical tandem cell with parallel connection when the both cells had the same thickness(1000nm).