NDLI: Wire-shaped ultraviolet photodetectors based on a nanostructured NiO/ZnO coaxial p–n heterojunction via thermal oxidation and hydrothermal growth processes

Content Provider	Royal Society of Chemistry (RSC)
Author	Ko, Yeong Hwan Yu, Jae Su Nagaraju, Goli
Copyright Year	2015
Abstract	We report the facile fabrication of wire-shaped ultraviolet photodetectors (WUPDs) by employing a nanostructured zinc oxide (ZnO)/nickel oxide (NiO) coaxial p–n heterojunction. The WUPD consists of a ZnO/NiO coaxial Ni wire and a twisted gold (Au) wire where the Ni and Au are used as the anode and cathode, respectively. For the coaxial p–n heterojunction, the NiO nanostructures (NSs) and the ZnO nanorods (NRs) are subsequently formed on the surface of Ni wire via thermal oxidation and hydrothermal growth processes. With an applied bias of −3.5 V, the WUPD exhibits good photoresponsivity of 7.37 A W−1 and an external quantum efficiency of 28.1% at an incident light wavelength of 325 nm. Under the UV illumination at a wavelength of 365 nm, the dark current and photocurrent are −3.97 × 10−7 and −8.47 × 10−6 A, respectively. For enhancing the photocurrent, the WUPD is threaded through a silver (Ag) coated glass tube which acts as a waveguide to concentrate the UV light of 365 nm on the WUPD. As a result, the photocurrent is significantly improved up to −1.56 × 10−5 A (i.e., 1.84 times) at the reverse bias of −3.5 V.
Starting Page	2735
Ending Page	2742
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	6
Journal	Nanoscale
DOI	10.1039/c4nr06662f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Anode Cathode Thermal oxidation Ultraviolet Waveguide Quantum tunnelling Wavelength Photocurrent Hydrothermal circulation Zinc oxide Nickel Photoreceptor cell Heterojunction
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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