Self-driven Photoelectrochemical UV-visible Photodetectors Using ZrO2@TiO2 Core-shell Nanorod Arrays Modified with Single-walled Carbon Nanotubes

We report a self-driven photoelectrochemical (PEC) photodetector (PD) using Ar-annealed ZrO 2 @TiO 2 core-shell nanorod arrays (TNRAs) modified with single-walled carbon nanotubes (SWCNTs) to enhance the photoelectric performance and extend the spectral range from UV to visible light. It is demonstrated that the PECPD based on SWCNTs/ZrO 2 @TNRAs structure has higher responsivity (155.56 mA/W and 1.75 mA/W) and faster response time (80 ms) than pure TNRAs-based PECPD under ultraviolet and visible irradiation at zero bias. The performance enhancement can be associated to the fact that ZrO 2 @TiO 2 core-shell structure can effectively suppress the recombination of photoexcited electrons and I 3 −in electrolyte and the SWCNTs loaded on the TNRAs can act as hole acceptors, providing sufficient active reactions sites for redox species.