Effect of ZnO layer thickness upon optoelectrical properties of NiO/ ZnO heterojunction prepared at room temperature

  • Ahmed Obaid M. AlzahraniEmail author
  • M. Sh. Abdel-wahab
  • Meshari Alayash
  • M. S. Aida


In this work, p-NiO/n-ZnO heterostructures were successfully prepared at room temperature using RF sputtering technique. The influence of ZnO layer thickness on the performance of the heterojunction was investigated. The deposited ZnO layers have a hexagonal Wurtzite structure with preferable growth orientations along (002) and (103) for thinner films. Increasing the thickness results in more crystallographic orientation randomness. The current–voltage measurements of the realized heterojunctions showed a clear rectifying behavior. The measured ideality factor varies from 2.5 to 1.6 according to the thickness of ZnO layer. The series resistance of the device is enlarged with increasing ZnO thickness. The deduced parameters from the I–V characteristics suggest that 200 nm is the optimal thickness of the ZnO layer according to our experimental conditions. We attribute the relatively better performance of this thickness to achieving reasonable compensation between serial resistance and ideality factor. The best heterojunction was tested and successfully used as a UV detector.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Ahmed Obaid M. Alzahrani
    • 1
    • 2
    Email author
  • M. Sh. Abdel-wahab
    • 1
    • 3
  • Meshari Alayash
    • 1
  • M. S. Aida
    • 1
    • 2
  1. 1.Center of NanotechnologyKing Abdulaziz UniversityJeddahSaudi Arabia
  2. 2.Physics Department, Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia
  3. 3.Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced SciencesBeni-Suef UniversityBeni-SuefEgypt

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