Abstract
Lead-free semiconductor materials are of great interest for energy harvesting and optoelectronics. We present a new synthesis method for silver bismuth iodide(Ag2BiI5) by iodizing of silver/bismuth iodide(Ag/BiI3) thin films. X-ray diffraction, energy dispersive spectroscopy and X-ray photoelectron spectroscopy analyses confirmed the formation of hexagonal Ag2BiI5 with nearly stoichiometric composition. The crystal structure, optoelectronic and photocatalytic properties of Ag2BiI5 thin films obtained by varying Ag thickness were examined. The films formed at different conditions showed good visible-near infrared(NIR) light absorption with direct bandgaps of 1.2 – 1.6 eV. Visible and NIR photodetector devices were fabricated using the Ag2BiI5 thin films. The photocatalytic activity of the Ag2BiI5 thin films was examined by studying the photodegradation of methylene blue (MB) dye as a representative contaminant. 96% of dye decay was obtained after 120 min of light irradiation for Ag2BiI5 thin films. This work will be an inspiration to explore more lead-free materials for Vis- NIR sensing and photocatalysis.
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