  In this article, we demonstrate CdSe-CuSbSe2-based double junction
two-terminal tandem solar cells simulated with SCAPS-1D. The highest
performance of the tandem cell has been confirmed by optimizing the electrical
and optical properties of window, top absorber, CdSe (bandgap 1.7 eV), bottom
absorber, CuSbSe2 (bandgap 1.08 eV) and back surface layers. In addition, the
effect of different parameters such as thickness, doping, defect density of
different layers has been investigated in details. With the optimized
condition, the modeled CdSe-CuSbSe2 double-junction two-terminal tandem solar
cell displays the noticeable efficiency of 42.64% with open circuit voltage of
2.09 V, short circuit current density of 24.09 mA/cm2 and fill factor of
84.36%, respectively. These results are highly propitious for the construction
of all-chalcogenide based high performance tandem photovoltaic cells in the
future.
