Effect of the Length of TiO2 Nanotube Arrays on Responsivity of Photoelectrochemical-Based Ultraviolet Photodetectors.

In this study, one-dimensional titanium dioxide (TiO 2) nanotube arrays (NTAs) with different tube lengths are synthesized via anodic oxidation of Ti foils and their ultraviolet (UV) light detection properties are investigated to determine their optimum growth conditions. A TiO2 nanotube ultraviolet photodetector based on photoelectrochemical cell is fabricated using the optimum TiO2 nanotubes and its characteristics in the ultraviolet region are determined. The photodetector is examined under a UV illumination intensity of 10 mW/cm2and at a wavelength of 368 nm. Its responsivity is measured to be about 96 μ A/cm2 and its response time is less than 0.2 s under an applied bias of 0.5 V. [ABSTRACT FROM AUTHOR]