Ultrasensitive V doped WO3 1D nanorods heterojunction photodetector with pronounced photosensing activities

In this study, vanadium-doped tungsten oxide (V-WO3) nanorods heterostructures are designed by a simple, facile, and eco-friendly hydrothermal method and applied for photo-sensing activities. Physical characterization results indicate the phase purity, crystalline nature, tuneable energy bandgap, higher surface area, and successful formation of V doped WO3 nanorods. Optoelectronic properties reveal pronounced photo-sensing capabilities of the designed material demonstrating efficient charge transfer. The photo current density is enhanced with laser power. Large values of open-circuit voltage (V-oc) and short-circuit current (Isc) in the range of 0.91 V and 28 mA/cm(2), respectively, are obtained at 56 mW/cm(2) power. The Isc is enhanced considerably as a function of power intensity of laser due to the formation of large number of photo-induced electron-hole pairs and large value of built-in potential. Furthermore, to estimate the response time of the device, the measured temporal photoresponse is 4500 A/W, several-fold higher than previously reported materials, associated with suppression in the dark current. In addition, the detectivity of V doped WO3 NRs photodetector lies in the range of 5.15 x 10(11) Jones and the calculated value of detectivity and EQE is similar to 70%. These results are interesting and provide a roadmap to design ultrasensitive photodetectors. (c) 2022 Published by Elsevier B.V.