Abstract
Recently, numerical simulation of lead (Pb)-free perovskite solar cells (LFPSCs) has attracted scientific community and received great attention. All-inorganic cesium antimony iodide (Cs3Sb2I9) which is perovskite-like material has been widely explored as light absorbing layer in the development of LFPSCs. In present work, we have reported the numerical simulation of LFPSCs with device architecture of FTO/TiO2/Cs3Sb2I9/spiro-OMeTAD/Au. The thickness of electron-transport layer (ETL), light absorber layer, and hole-transport layer (HTL) were optimized to achieve the highest efficiency. The optimized LFPSCs exhibited excellent efficiency of 12.54% using SCAPS-1D. Further, Cs3Sb2I9 films were obtained and their physiochemical and optical properties were examined by X-ray diffraction (XRD), scanning-electron spectroscopy (SEM), and ultraviolet–visible (UV–vis) absorption spectroscopy. Furthermore, LFPSCs device (FTO/TiO2/Cs3Sb2I9/spiro-OMeTAD/Au) was fabricated under controlled humidity (∼30–40%). The fabricated LFPSCs showed good efficiency of 1.07%.
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