Pd Nanoparticle Adsorption ZnO Nanorods for Enhancing Photodetector UV-Sensing Performance

Abstract

Ultraviolet (UV) detection is an important index, as UV rays can cause skin diseases in humans. To enhance the performance of UV photodetectors, we fabricated palladium nanoparticles- (Pd NPs) modified ZnO nanorods. The surface morphology is observed by using transmission electron microscopy and transmission electron microscopy. The crystal structure is analysed by using X-ray diffraction. The optical property is investigated by using photoluminescence spectra. The text{I}-{mathrm {dark}} of the ZnO and Pd/ZnO samples was 5.05times 10 {-8} and 2.24 times 10 {-9} A when a 1 V bias was applied. On the other hand, the text{I}-{mathrm {photo}} of the ZnO and Pd/ZnO samples was 2.56times 10 {-6} and 4.38times 10 {-6} A when the sample is illuminated UV light (365 nm). The current ratio of text{I}-{mathrm {photo}}/text{I}-{mathrm {dark}} for the ZnO and Pd/ZnO samples was 50.8 and 1960, respectively. The enhanced performance of the Pd NPs can produce a strong electric field after light is absorbed via the localised surface plasmon resonance effect.