| http://www.w3.org/ns/prov#value | - junction, which results in a built-in potential and makes the solid-liquid heterojunction work in photovoltaic mode.Keywords: ZnO nanoneedle arrays, Hydrothermal method, Ultraviolet photodetector, Solid-liquid heterojunctionBackgroundUltraviolet (UV) detectors play an essential role in a wide range of civil and military applications including UV astronomy, environmental monitoring, flame sensing,
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