High-efficiency lead-free all-perovskite tandem solar cells achieving 28.22 % power conversion efficiency: A Cs2AgBi0.75Sb0.25Br6/FASnI3 heterostructure design

IF 3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-08-09 DOI:10.1016/j.rio.2025.100882

Sarowr Basm Almahsen, Ghaleb Ali Al-Dahash

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Abstract

This research looks at how well an all-perovskite, lead-free tandem solar cell works. It has a wide-bandgap (1.8 eV) Cs₂AgBi₀.₇₅Sb₀.₂₅Br₆ top subcell and a narrow-bandgap (1.41 eV) FASnI₃ bottom subcell. We show a very efficient device design by carefully adjusting the thicknesses of the absorber layers (600 nm for the top cell and 500 nm for the bottom cell) and the charge transport layers (TiO₂ as ETL and Cu₂O as HTL). Numerical simulations using SCAPS-1D under AM1.5G light show that the best power conversion efficiency (PCE) achieved is 28.22 %, along with a very satisfactory fill factor (88.74 %), short-circuit current density (27.886 mA/cm²), and Open-circuit voltage (1.1402 V) at 300 K. The optimized structure (FTO/TiO₂/Cs₂AgBi₀.₇₅Sb₀.₂₅Br₆/FASnI₃/Cu₂O) highlights the synergistic potential of these lead-free perovskites in tandem configurations. These results not only advance the development of environmentally friendly photovoltaics but also pave the way for scalable, high-performance tandem solar cells that rival their lead-based counterparts.

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实现28.22%功率转换效率的高效无铅全钙钛矿串联太阳能电池：Cs2AgBi0.75Sb0.25Br6/FASnI3异质结构设计

这项研究着眼于全钙钛矿无铅串联太阳能电池的工作效果。它具有一个宽带隙（1.8 eV）的Cs2AgBi0.75Sb0.25Br6顶部子单元和一个窄带隙（1.41 eV）的FASnI3底部子单元。通过仔细调整吸收层（顶部电池为600 nm，底部电池为500 nm）和电荷传输层（TiO2为ETL， Cu2O为HTL）的厚度，我们展示了一个非常有效的器件设计。利用SCAPS-1D在AM1.5G光下进行的数值模拟表明，该器件的最佳功率转换效率（PCE）为28.22%，填充系数（88.74%）、短路电流密度（27.886 mA/cm2）和开路电压（1.1402 V）均达到了令人满意的水平。优化后的结构（FTO/TiO2/Cs2AgBi0.75Sb0.25Br6/FASnI3/Cu2O）突出了这些无铅钙钛矿串联结构的协同潜力。这些结果不仅推动了环境友好型光伏电池的发展，而且为可扩展的高性能串联太阳能电池铺平了道路，可以与铅基太阳能电池相媲美。

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