Organic-Inorganic Perovskite-Metal Sulfide Composite Nanorods for Solar Cell Application*

One-dimensional (1D) Organic-inorganic perovskites (OIPs) have become widely used materials in numerous optoelectronic (OE) researches due to better optical performance and economical fabrication process. This work demonstrates the nanorod synthesis of CH₃NH₃PbI₃ (MAPbI₃) perovskite with metal sulfide (MS) composite nanorods vai one-step spin coating for solar cell (SC) application. The crystal structure of MAPbI₃-MS, determined using X-ray diffraction, revealed a decrease of cell volume and a phase transition with increasing MS concentration. Fourier transform infrared spectroscopy was performed and all preferred bonds were observed. Nanorod grains were observed via Scanning electron microscopy with a decreasing diameter from 200 nm to 100 nm via MS incorporation. The thin films showed a fine absorbance in the visible and near-infrared wavelength region with a high absorption coefficient up to 10⁴ cm^-1. The overall absorption coefficient increased after MS addition. All the thin films showed very less reflectance (<7.5%) hence very less optical loss. The bandgap of the thin films was calculated using Tauc plot ranges from 1.5 eV - 1.6 eV with increasing MS stoichiometry which is preferable for SC and other OE applications.