High Detectivity Photodetector Based on WO3 Nanowires by the Surface Plasmonic Effect of Ag Nanoparticles

This letter reports the synthesis of silver (Ag) nanoparticles (NPs) decorated on WO3 nanowires (NWs) using the glancing angle deposition (GLAD) technique for photodetector applications. Ag/WO3 NWs device reveals a significantly low dark current of $8.63\times10$ −11 A. The device also obtained a maximum photoresponsivity of 70.1 A/W and detectivity of $1.61\,\,\times10$ 14 Jones at 360 nm with an internal gain of 241. Moreover, the Ag decorated WO3 NWs shows a rise time of 0.84 s and a fall time of 0.78 s at an applied bias of 3V.