Design and numerical simulation of B‑γ CsSnI3‑based perovskite solar cells: Conventional versus inverted configurations

•This research utilizes SCAPS for an in-depth simulation study on B-γ CsSnI3 perovskite solar cells (PSCs).•A calibration step of the simulation model against fabricated B-γ CsSnI3 cell enables accurate validation of the simulation model.•Both inverted (n-i-p) and conventional (p-i-n) cell configurations are explored,•Optimizations achieved PCEs of 16.11% and 13.76% for p-i-n and n-i-p structures, respectively.•The study provides valuable insights into improving PSC efficiency by adjusting band alignments, optimizing back contact work functions, and considering HTL and ETL-free structures.