Abstract
A series of ZnCdO thin films have been fabricated on sapphire by pulsed-laser deposition (PLD), successfully. To investigate the effect of Cd concentration on structural and optical properties of ZnCdO films, x-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), and x-ray photoelectron spectroscopy (XPS) are employed to characterize the films in detail. The XRD pattern indicates that the ZnCdO thin films have high single-orientation of the c axis. The energy bandgap values of ZnCdO thin films decrease from 3.26 eV to 2.98 eV with the increasing Cd concentration (x) according to the − curve. Furthermore, the band offsets of ZnCdO/ZnO heterojunctions are determinated by XPS, indicating that a type-I alignment takes place at the interface and the value of band offset could be tuned by adjusting the Cd concentration.
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