Abstract
Ultraviolet (UV) photodetectors are of a great interest to a wide range of industrial, military, environmental, and biomedical applications. Because of many advantages including low cost, ease of fabrication, high sensitivity, and strong radiation hardness, metal oxide nanostructures are considered promising materials for UV detection. A review of the most recent developments in the field of metal oxide UV photodetectors is divided into two sections. The first section introduces the basic properties of various wide bandgap metal oxides, the UV detection mechanism, and the figures of merit of UV photodetectors. Performance comparison of UV photodetectors using various metal oxide nanostructures and device configurations is also presented in the first section. The second section is devoted to metal/semimetal nanostructures for the performance enhancement of UV photodetectors, which illustrate enhanced devices using either surface plasmon resonance or a carrier transfer mechanism.
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