Design and numerical characterization of high-performance all-perovskite multi-junction solar cells

Tunable bandgap and excellent optoelectronic properties can make perovskite solar cells (PSC) achieve high power conversion efficiencies in single junction as well as tandem architecture. In this work, 3 types of perovskite solar cell architectures i.e., single-junction, all-perovskite tandem and all-perovskite triple-junction, are modeled in SunSolve. The optimized layer thickness, reflection/parasitic absorptions, quantum efficiency, IV characteristics and power conversion efficiencies (PCE) of each cell are analyzed in detail. The single-junction solar cell of CH3NH3PbI3 with bandgap of 1.55 eV produces the PCE of 21.4%. The all-perovskite tandem solar cell of (CH3NH3)0.9Cs0.1Pb(I0.6Br0.4)3 (1.82 eV) as top sub-cell and CH3NH3Pb0.5Sn0.5I3 (1.22 eV) as bottom sub-cell exhibits a PCE of 26.06%. While the all-perovskite triple-junction solar cell of FA0.83Cs0.17Pb(I0.7Br0.3)3 (1.94 eV) as top sub-cell, CH3NH3PbI3 (1.55 eV) as middle sub-cell and CH3NH3Pb0.5Sn0.5I3 (1.22 eV) as bottom sub-cell has the remarkable PCE potential of 28.38%. This work guides towards multi-junction solar cells based on perovskite materials for the low-cost utilization of solar energy.