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We propose a triple junction CBTSSe/CZTS/ACZTSe solar cell using earth abundant and non‐toxic CBTSSe, CZTS, and ACZTSe as the primary absorbing layers for top, middle, and bottom cells, respectively. Using rigorous optoelectronic simulation, we analyze the performance of the proposed cell and vary absorber thicknesses in order to maximize its efficiency. The maximum obtainable efficiency is calculated to be 36.04% with 2.73 V open circuit voltage, 17.88 mA cm−2 short circuit current density, and 73.7% fill factor including Shockley–Read–Hall, surface and radiative recombination mechanisms. The maximum achievable efficiency can be obtained from an optimized device structure with 250, 300, and 1000 nm thicknesses of CBTSSe, CZTS, and ACZTSe, respectively. The design and analyses presented in this work would help in achieving highly efficient eco‐friendly inorganic solar cells. [ABSTRACT FROM AUTHOR]

In this paper, we present a detailed performance analysis of monolithically integrated dual junction silicon-based tandem solar cells with perovskite as the top cell material, using physics-based model. The perovskite cell is modeled based on four different configurations, namely p-i-n, p-p-n, n-i-p, and n-p-p whereas standard models are considered for the silicon cell. We explore the sensitivity of the tandem cell performance by varying the transport layer properties, namely the minority carrier surface recombination velocities. We also investigate the effect of varying the sub-cell thicknesses on the tandem efficiency. The results illustrate the superior effect of top cell parameters, both surface recombination velocity and thickness, in improving the cell performance. We also demonstrate a range of optimum thickness for the top sub-cell while examining the co-dependence between the absorber layer thickness and minority carrier surface recombination velocities. In closing, we study the effect of series and shunt resistances on the overall tandem cell efficiency. [ABSTRACT FROM AUTHOR]