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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]

Thin-film silicon solar cells have sparked a great deal of research interest because of their low material usage and cost-effective processing. Despite the potential benefits, thin-film silicon solar cells have low power-conversion efficiency, which limits their commercial usage and mass production. To solve this problem, we design an ultrathin dual junction tandem solar cell with Cu 2 ZnSnS 4 (CZTS) and crystalline silicon (c-Si) as the main absorbing layer for the top and bottom cells, respectively, through optoelectronic simulation. To enhance light absorption in thin-film crystalline silicon, we use silver nanoparticles at the rear end of the bottom cell. We utilize amorphous Si with a c-Si heterojunction to boost the carrier collection efficiency. Computational analyses show that within 9 μm thin-film c-Si, we achieve 28.28% power conversion efficiency with a 220 nm top CZTS layer. These findings will help reduce the amount of Si (∼10 vs. ∼180 μm) in silicon-based solar cells while maintaining high power conversion efficiency., Competing Interests: There are no conflicts of interest to declare., (This journal is © The Royal Society of Chemistry.)