Sub-Bandgap Energy Photoresponse of Individual V2O5 Nanowires

Photoresponse of individual V2O5 nanowire (NW) under different controlled conditions were investigated. Individual V2O5 NW showed a significant photoresponse at vacuum condition and very small photocurrent (similar to 1 nA) in ambient condition, upon global irradiation of 808 nm laser beam. The photoconducting properties of the V2O5 NW are investigated at various pressure conditions and with varying laser power. The observed sub-bandgap energy laser irradiation induced photoresponse can be attributed to factors such as defect level excitation, desorption of adsorbed gas species and laser induced heating effects.