An Efficient Method To Form Heterojunction CdS/TiO₂ Photoelectrodes Using Highly Ordered TiO₂ Nanotube Array Films

A heterojunction CdS/TiO 2 photoelectrode is prepared by filling CdS nanoparticles into one-dimensional TiO 2 nanotube (NT) array films. The self-assembled TiO 2 NTs are fabricated by an anodization method and sensitized with CdS nanoparticles by the close space sublimation technique. The photoactivity of the as-prepared photoelectrodes was measured in a photoelectrochemical solar cell. Under AM 1.5G illumination, a 5.6 mA/cm 2 short-circuit current density is achieved using the CdS modified photoelectrode, which represents an enhancement by a factor of 36 in photoactivity compared with that of the plain TiO 2 NT array film.