Analytical Model of All-Inorganic 2-D Ruddlesden-Popper (RP) Layered Halide Perovskite Solar Cells and Their Performance Optimization

All-inorganic 2-D Ruddlesden-Popper (RP) layered halide perovskite absorbers will be the real game changer for perovskite solar cells (PSCs) in the near future. In this work, we report an analytical model for all-inorganic 2-D RP layered mixed halide perovskite-based solar cells with Cs2PbI2Cl2 and Cs2SnI2Cl2 as absorbers. As these perovskites manifest layer-dependent properties, we investigate the variation of performance for monolayer, bilayer, and trilayer of the said layered perovskites. In addition, we explore the photovoltaic performance with these absorbers having two different architectures, namely, p-i-n and n-i-p. The power conversion efficiency (PCE) values are found to be significantly higher in the case of the n-i-p architecture for all the absorbers. The obtained PCEs are as high as 24.37% for bilayer Cs2PbI2Cl2 and 23.45% for trilayer Cs2SnI2Cl2 for n-i-p architecture. Moreover, we obtain the highest PCE of 24.58% at 500-nm thickness of bilayer Cs2PbI2Cl2 and 23.61% at 475-nm thickness of trilayer Cs2SnI2Cl2 for the n-i-p architecture.