Figure 3From: Giant Persistent Photoconductivity of the WO3 Nanowires in Vacuum ConditionThe I ds – V ds curves of the device coated with SiO 2 under dark ( black curve ) and 312-nm illumination ( red curve ) and without SiO 2 coating under 312-nm UV illumination ( blue curve ), respectively. Inset is the device coated with 200-nm SiO2 layer.Back to article page