Ultraviolet photodetection based on high-performance co-plus-ni doped zno nanorods grown by hydrothermal method on transparent plastic substrate

Hafiz Muhammad Salman Ajmal, Fasihullah Khan, Kiyun Nam, Hae Young Kim, Sam Dong Kim

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

A growth scheme at a low processing temperature for high crystalline-quality of ZnO nanostructures can be a prime stepping stone for the future of various optoelectronic devices manufactured on transparent plastic substrates. In this study, ZnO nanorods (NRs) grown by the hydrothermal method at 150 °C through doping of transition metals (TMs), such as Co, Ni, or Co-plus-Ni, on polyethylene terephthalate substrates were investigated by various surface analysis methods. The TM dopants in ZnO NRs suppressed the density of various native defect-states as revealed by our photoluminescence and X-ray photoelectron spectroscopy analysis. Further investigation also showed the doping into ZnO NRs brought about a clear improvement in carrier mobility from 0.81 to 3.95 cm2/V-s as well as significant recovery in stoichiometric contents of oxygen. Ultra-violet photodetectors fabricated with Co-plus-Ni codoped NRs grown on an interdigitated electrode structure exhibited a high spectral response of ~137 A/W, on/off current ratio of ~135, and an improvement in transient response speed with rise-up and fall-down times of ~2.2 and ~3.1 s, respectively.

Original languageEnglish
Article number1225
Pages (from-to)1-20
Number of pages20
JournalNanomaterials
Volume10
Issue number6
DOIs
StatePublished - Jun 2020

Keywords

  • Codoping in ZnO
  • Plastic substrate
  • Spectral responsivity
  • UV detector
  • ZnO nanorods

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