TURK 2025

This study investigates the performance of cesium lead triiodide (CsPbI₃)-based perovskite solar cells (PSCs), incorporating titanium dioxide (TiO₂) as the electron transport layer (ETL), copper barium tin sulfide (CBTS) as the hole transport layer (HTL), and nickel (Ni) as the back contact layer. CsPbI₃ was chosen for its exceptional photovoltaic properties, including a near-optimal bandgap of ~1.7 eV, high absorption coefficients, and superior charge carrier mobility, making it a promising candidate for achieving high power conversion efficiencies (PCEs) in PSCs. The objective of this study is to optimize the device performance by examining the effects of absorber layer thickness, doping density, and defect density on device efficiency using SCAPS-1D simulation software. The simulation results were compared with those from previous studies to evaluate performance trends and identify optimization strategies. The study also aims to assess the impact of interface defect layers on the overall device performance. Specifically, this work examines how these parameters influence the PCE and identifies the optimal conditions for achieving high-performance CsPbI₃-based PSCs. The SCAPS-1D simulation achieved a maximum power conversion efficiency (PCE) of 24.17%, showing a 27% improvement compared to values reported in related simulation studies. These results demonstrate the potential of CsPbI₃ as a high-performance absorber layer and provide valuable insights for the further development and optimization of PSCs.