An inorganic lead-free Cs2SnI6-based perovskite solar cell optimization by SCAPS-1D

Cs₂SnI₆ is an environmentally friendly and reliable perovskite solar cell (PSCs) material. Its optimal band gap and strong light absorption make it a promising candidate for the absorption layer. However, the current challenge is to improve its photoelectric conversion efficiency. To address this, this study investigates the performance of PSCs based on Cs₂SnI₆ using SCAPS-1D simulation. The influence of various factors on PSC performance is examined, including different hole transport layers(HTLs) and electron transport layers(ETLs), perovskite layer thickness, ETL doping density, HTL doping density, absorber doping density, perovskite layer defect density, different back contacts and temperature. Finally, a Cs₂SnI₆-based solar device with an inorganic configuration of FTO/NiO/Cs₂SnI₆/SnO₂/Au has been developed, reaching the power conversion efficiency(PCE) of 28.69 %. The study demonstrates that Cs₂SnI₆ PSCs exhibit promising photovoltaic performance, offering valuable insights for the solar energy sector in the production of cost-effective, efficient, and environmentally friendly Cs-based perovskite solar cells.