Abstract
Bandgap-graded ZnO/(CdS)1−x(ZnS)x (0 ≦̸ x ≦̸ 1) coaxial nanowire arrays on transparent conducting oxide substrates have been successfully fabricated by a facile two-step-approach, combining hydrothermal method and successive ion exchange reactions. Energy-dispersive x-ray spectroscopy elemental analysis suggests that the shells are composed of (CdS)1−x(ZnS)x double-layer structures, which are thoroughly and tightly synthesized on the ZnO cores, and play the role of sensitizers. The as-prepared ZnO/(CdS)1−x(ZnS)x coaxial nanowire arrays are demonstrated to be controllably adjusted in their optical absorption from ultraviolet to green via compositional effect, and are promising electrodes for semiconductor-sensitized solar cells. The photoelectrode based on the ZnO/CdS coaxial nanowire array shows good performance with power conversion efficiency of 2.093%, a short-circuit current density 7.733 mA cm−2, and an open-circuit voltage 0.536 V.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call