Advancing tandem solar technology: Achieving 37% efficiency with monolithically configured Ag2MgSnS4/SnS solar cells

•This current study presents the findings of simulation-based research on a novel 2 T monolithic SC.•The two cells combined in the structure described in this paper are classic SnS with a narrow Eg (1.3 eV) and large Eg Ag2MgSnS4 (1.63 eV), respectively.•The tandem model demonstrated high efficiency with good photovoltaic metrics.•In the current work, a 2 T tandem model with the main parameters of Jsc(mA/cm2) = 20.38, Voc(V) = 2.06, FF(%) = 88.77, and PCE (%) = 37.26 is concluded. This current study presents the findings of simulation-based research on a novel 2 T monolithic SC. The two cells combined in the structure described in this paper are classic SnS with a narrow Eg (1.3 eV) and large Eg Ag2MgSnS4 (1.63 eV), respectively. In order to determine whether the suggested tandem design is viable, top and bottom cells are first simulated and calibrated to achieve the best performance, and then both devices are assessed for tandem configuration. The tandem model demonstrated high efficiency with good photovoltaic metrics. The top and bottom cells’ current matching circumstances are attained at 700 nm of Ag2MgSnS4 thickness. In the current work, a 2 T tandem model with the main parameters of Jsc(mA/cm2) = 20.38, Voc(V) = 2.06, FF(%) = 88.77, and PCE (%) = 37.26 is concluded.