Document Type : Research
Author
Department of Electrical and Electronic Engineering, Bou.C., Islamic Azad University, Boukan, Iran
Abstract
A B S T R A C T
Lead-free, all-inorganic perovskite solar cells (PSCs) have emerged as promising environmentally benign and thermally stable alternatives to conventional lead-based devices. In this study, a comprehensive SCAPS-1D numerical simulation was conducted to investigate and optimize the photovoltaic performance of PSC based on Sr3SbI3 (Strontium Antimony Iodide) through systematic engineering of the absorber and charge transport layers. Various inorganic electron transport layers (ETLs) and hole transport layers (HTLs) were evaluated with particular emphasis on energy band alignment and interfacial recombination processes. An optimized device configuration of ITO/WO₃/Sr3SbI3/CuSCN/Au was identified, enabled by a favorable conduction band offset at the ETL/absorber interface and a near-flat valence band offset at the absorber/HTL interface. This band alignment facilitates efficient charge extraction while enhanced electron and hole blocking barriers effectively suppress interfacial recombination losses. Further optimization of absorber thickness, doping concentration, and defect density as well as parasitic resistances led to a high power conversion efficiency of 28%, accompanied by an open-circuit voltage of 1.07 V, a short-circuit current density of 31.8 mA/cm2, and a fill factor of 82%. These findings underscore the critical importance of interface and transport layer engineering in the development of high-efficiency, lead-free PSCs and provide valuable insights for future experimental realization.
Keywords
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