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(a) Optical microscope and (b) scanning electron microscope images of the ZnO nanowire UV detector. The inset in (b) shows the nanowires across the gap. (c) Schematic of the experimental setup used to record photoresponses under different RHs. (d) Time-dependent photoresponses of the ZnO nanowire UV detector with an applied voltage of 5 V under different RHs. UV light with an irradiance of was switched on at 30 s and off at 90 s. The inset gives the RH values for the curves.
Schematic of the photoresponse process, the valence band and the conduction band of a ZnO nanowire in [(a)–(d)] dry air and [(e)–(h)] wet air. Blue and orange dots represent electrons and holes, respectively.
Decay times of the photocurrent under different humidity conditions.
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