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 WO
₃
nanowires (NWs) using the glancing angle deposition (GLAD) technique for photodetector applications. Ag/WO
₃
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 WO
₃
NWs shows a rise time of 0.84 s and a fall time of 0.78 s at an applied bias of 3V.