Computational study of a novel combination of dual-absorber structured perovskite solar cell with theoretical efficiency of 36.37%

This research explores an innovative dual-absorber solar cell design that incorporates MAGeI 3 and CsSnI 3 layers, aiming to achieve efficiency levels that exceed those of current single-junction solar cells. Simulations conducted with SCAPS-1D software identified optimal layer thicknesses for both materials, resulting in a maximum efficiency that significantly surpasses previously documented values for similar configurations. When considering defect densities, the optimized parameters revealed a strong open-circuit voltage, a high short-circuit current density, and an impressive fill factor, leading to a noteworthy overall efficiency even at certain defect levels. The enhanced performance of this dual-absorber design is attributed to the complementary bandgaps of the materials, which improve light absorption and charge carrier dynamics. Specifically, the smaller bandgap of CsSnI 3 allows for more effective harvesting of lower-energy photons, and the higher bandgap of MAGeI 3 helps in the absorption of higher-energy photons, while the dual-layer structure minimizes recombination losses. Further analyses of quantum efficiency and current-voltage characteristics support the architecture’s potential to approach theoretical efficiency limits. This study suggests that the proposed dual-absorber configuration holds considerable promise for advancing solar cell technology and warrants further experimental validation.