Investigation of Cssn0.5ge0.5i3-On-Si Tandem Solar Device Utilizing SCAPS Simulation
IEEE Transactions on Electron Devices
With the perovskite-on-Si tandem solar technology at the onset of commercialization, it becomes imperative to tackle the toxicity concern of Pb in the perovskite structure. This study utilizes solar cell capacitance simulator (SCAPS) simulation software to investigate a tandem device with the crystalline Si (c-Si; bandgap: 1.12 eV) bottom cell in a mechanically stacked configuration with the stable and nontoxic CsSn0.55Ge0.55I3 (bandgap: 1.5 eV) as the top cell active layer. The device performance has been compared against that of a traditional tandem solar device setup utilizing MAPbI3 (bandgap: 1.55 eV) as the top cell active layer. Simulation results reveal power conversion efficiency (PCE) values of standalone CsSn0.55Ge0.55I3, MAPbI3, and c-Si cells to be 7.45%, 20.01%, and 25.95%, respectively, all in good agreement with published experimental results. The current matching condition between the top perovskite cell and the bottom c-Si cell has been probed through variation of perovskite layer thickness, yielding optimized thickness values for CsSn0.55Ge0.55I3 and,,,MAPbI3 to be 365 and 225 nm, respectively. A tandem device with CsSn0.55Ge0.55I3-on-Si showcases a PCE of 28.53% (Voc: 1.72 V; Jsc: 20.02 mA/cm²; and FF: 83.74%) compared with an MAPbI3-on-Si device yielding a PCE of 32.29% (Voc: 1.88 V; Jsc: 19.969 mA/cm²; and FF: 85.99%). The results and analyses of this study highlight the feasibility of utilizing nontoxic materials, such as CsSn0.55Ge0.55I3, to attain high tandem device PCE values.
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Islam, M. T., Jani, M. R., Islam, A. F., Shorowordi, K. M., Chowdhury, S., Nishat, S. S., & Ahmed, S. (2021). Investigation of CsSn0.5Ge0.5I3-on-Si Tandem Solar Device Utilizing SCAPS Simulation. IEEE Transactions on Electron Devices, 1–8. https://doi.org/10.1109/ted.2020.3045383