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

초록

Herein, flexible near-infrared (NIR) photodetectors were prepared using silver telluride (Ag5Te3) nanoparticles (NPs) for optoelectronic applications. For the main channel materials of the photodetectors, Ag5Te3 NPs were used, which were synthesized in an aqueous solution. Moreover, Ag5Te3 thin films were successfully fabricated on plastic substrates at 150 degrees C using redistributed Ag5Te3 NPs in aqueous inks. The crystal structure, chemistry, and optoelectronic properties of the synthesized photodetectors were studied. The fabricated flexible Ag5Te3-based photodetectors achieved a detectivity of 6.27 x 10(9) cm Hz(1/2) W-1 (>10(9)) at room temperature under similar to 0.35% compressive and tensile strains. The obtained detectivity value exceeds those of two-dimensional inorganic layered material phototransistors-such as MoS2-or commercial thermistor bolometers at room temperature (similar to 10(9)). Furthermore, the proposed novel method for the synthesis of Ag5Te3 thin films on plastic substrates can be applied to other Ag5Te3-based applications in the future.