Abstract
This work proposes and numerically optimises a four terminal mechanically stacked tandem with CuI/CH3NH3SnI3−x Br x /ZnO:Al/IZO as top subcell and IZO/GaSe/CI(G)S/CIGS-P+ as bottom subcell. The standalone optimised subcells exhibited power conversion efficiencies of 27.03% (CH3NH3SnI3 based cell) and 24.42% (CIGS based cell), with the tandem configuration showing a combined power conversion efficiency of 51.45%. Band gap optimisation of the CIGS based solar cell also revealed that its gallium content had to be nullified, which is a favourable outcome considering the high cost of gallium. Furthermore, the tandem device also exhibited excellent quantum efficiency while spanning the UV-Vis-NIR range of photon wavelength absorption, as a result of the CI(G)S based subcell complementing the top CH3NH3SnI3 based subcell.
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