Hydrothermal growth ofregular ZnO nanoflowers for superhigh-detectivity ultraviolet photodetector application

Abstract:

In this work, a facile hydrothermal method was used to grow ZnO nanoflowers onto an interdigital patterned fluo-rine-doped tin oxide (FTO) glass substrate, the crystal structure and morphology of the sample were first investigated. The results showed that a great number of regular ZnO nanoflowers grew onto the substrate. Furthermore, the ZnO nanoflowers were used as photosensitive layers, a ultraviolet (UV) photodetector was achieved, its UV sensing performance was evaluated in detail. The results indicated that this ZnO nanoflowers UV photodetector exhibited good response to 365 nm UV light, its responsivity and detectivity were up to 135.5 A/W (5 V) and 1.5 ? 1013 Jones, respectively, the response speed was rapid (4.96 s). This work explored a new way for achieving the high-performance nanostructured ZnO UV photodetectors.

Key words:ZnO nanoflowers; UV photodetector;Hydrothermal method; Detectivity