Hydrothermal fabrication of p‐Cu <sub>2</sub> O−n‐ZnO films and their properties for photodegradation and ultraviolet sensors
Yu‐Xian Li, Kao‐Shuo Chang
Abstract
Abstract This article reports spin coating and hydrothermal approaches to the synthesis of Cu 2 O seed layer−ZnO and Cu 2 O film−ZnO heterojunction films on fluorine‐doped tin oxide substrates. Cu 2 O seed layers and an ethylene glycol (EG) reducing agent were employed to obtain pure, uniform, and adhesive Cu 2 O films on the substrate. Transmission electron microscopy validated the heterojunctions with clear interfaces between each component on the p‐Cu 2 O film−n‐ZnO (with EG) sample, the conductive types of which were determined through Mott−Schottky measurements. Constructed energy band diagrams supported the Mott−Schottky result, manifesting favorable conduction band positions for the generation of •O 2 − radicals for all constituent materials and indicating smooth charge carrier transport for the p‐Cu 2 O film−n‐ZnO (with EG) sample. Furthermore, abundant p−n junction interfaces synergistically enabled the sample to exhibit the most satisfactory photodegradation capability (rate constant ≈ 8.9 × 10 −3 min −1 ), which was attributable to the predominance of •OH radicals. The sample's rectifying (diode) behavior with a ratio of the current density ( J ) at +3 V (forward bias) to that at −3 V (reverse bias) of approximately 27 was observed without ultraviolet illumination. Moreover, the J at −3 V is under illumination approximately 80 times that without illumination, implying the suitability of the sample for UV detectability.