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

  • Hwan Ko Y
  • Nagaraju G
  • Su Yu J
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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 AW(-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 x 10(-7) and -8.47 x 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 x 10(-5) A (i.e.,
1.84 times) at the reverse bias of -3.5 V.

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