Simulation Study of Environmentally Friendly Lead-Free All-Perovskite Tandem Solar Cells

Wei Luo; Yan Hua; Jian Han

doi:10.54691/1zd8kt57

Authors

Wei Luo
Yan Hua
Jian Han

DOI:

https://doi.org/10.54691/1zd8kt57

Keywords:

Perovskite; Solar Cell; Tandem; Lead-free; Device Simulation.

Abstract

The toxicity of lead in perovskite solar cells has long been a significant barrier to their widespread commercialization. The improvement of environmentally friendly tandem solar cells presents the additional challenge of identifying highly efficient materials for both the wide-bandgap top cell and the narrow-bandgap bottom cell. In this study, we have reported a lead-free, non-toxic tandem perovskite solar cell , investigated through numerical simulations, by pairing an Sb³⁺-doped double perovskite, Cs₂AgBi_0.75Sb_0.25Br₆, with a bandgap of 1.8 eV, as the top cell, with a tin-based MASnI₃ bottom cell, which has a bandgap of 1.3 eV. Upon optimization, the simulated device achieves an open-circuit voltage of 2.29 V, a current density of 15.5 mA/cm², and a remarkable photovoltaic conversion efficiency of 26.8%. These results are on par with the performance of state-of-the-art Pb-based tandems, highlighting the competitiveness of Pb-free materials. These simulation results highlight the potential of lead-free perovskite tandem architectures for environmentally sustainable, high-efficiency photovoltaic applications.

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