In the last decade, lead perovskites have shown a remarkable performance in photovoltaic applications, but they are vulnerable to stability problems. Therefore, in order to obtain lead-free materials that could successfully replace the single perovskites, we have experimentally realized methylammonium (MA) based double perovskite (MA)2NaBiCl6 for the very first time by the single-step method of hydrothermal which could be a potential analog of lead-based single perovskite for various semiconducting applications. We have investigated the structural characteristics of ((MA)2NaBiCl6 from X-Ray Diffraction (XRD) measurement. The observed diffraction peaks confirm the phase formation of the (MA)2NaBiCl6 and are in accordance with the reference data. To look into the optical behavior of (MA)2NaBiCl6, we have done a room temperature Photoluminescence (PL) spectroscopy experiment and observed a broad PL peak at 480 eV corresponding to an optical band gap of 2.58 eV attributed to the phenomena of phonon-assisted carrier recombination and band-to-band transition in the synthesized material. Moreover, an excellent absorbance peak has been seen from the ultraviolet-visible (UV-vis) spectroscopy plot. Furthermore, a direct and indirect bandgap of 2.25 eV and 2.01 eV respectively has been observed from the Tauc plot extracted using UV-vis data. Also, we have observed a good transmittance behavior from Fourier Transform Infrared (FTIR) spectroscopy plot. The Scanning Electron Microscopy (SEM) images were observed for (MA)2NaBiCl6 which indicate the presence of a uniform nanorod-like structure. This novel finding provides a stable and greener alternative for lead halide-based single perovskite to the research and scientific community for numerous semiconducting applications.
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