Room-Temperature High-Detectivity Flexible Near-Infrared\nPhotodetectors with Chalcogenide Silver Telluride Nanoparticles

Abstract

Herein, flexible\nnear-infrared (NIR) photodetectors were prepared\nusing silver telluride (Ag₅Te₃) nanoparticles\n(NPs) for optoelectronic applications. For the main channel materials\nof the photodetectors, Ag₅Te₃ NPs were used,\nwhich were synthesized in an aqueous solution. Moreover, Ag₅Te₃ thin films were successfully fabricated on plastic\nsubstrates at 150 °C using redistributed Ag₅Te₃ NPs in aqueous inks. The crystal structure, chemistry, and\noptoelectronic properties of the synthesized photodetectors were studied.\nThe fabricated flexible Ag₅Te₃-based photodetectors\nachieved a detectivity of 6.27 × 10⁹ cm Hz^1/2 W^–1 (>10⁹) at room temperature under\n∼0.35% compressive and tensile strains. The obtained detectivity\nvalue exceeds those of two-dimensional inorganic layered material\nphototransistorssuch as MoS₂or commercial\nthermistor bolometers at room temperature (∼10⁹).\nFurthermore, the proposed novel method for the synthesis of Ag₅Te₃ thin films on plastic substrates can be applied\nto other Ag₅Te₃-based applications in the future.