Effects of charge carrier density of ZnO film used in UV sensors: difficulties in measurement and rectification method

Seydiren Seeneevassen, Mohammad Ali Mohammadzadeh Kashan, N. Ramakrishnan

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1 Citation (Scopus)


In this Technical Note, we demonstrate a rectification method to enable the use of zinc oxide (ZnO) films in conductometric ultraviolet (UV) sensors. The phenomenon of persistent conductivity has long impeded the employment of ZnO films as conductometric UV sensors and eventually yields photo-induced current saturation in the film. To address this problem, we propose measuring the change in current in a transient response compromising of an OFF period of 60 s followed by an ON period of 20 s. In addition, we have investigated the effects of temperature and relative humidity, and dyanamic response of the sensor for different UV intensities. The experimental result shows that this measurement technique allows the ZnO film to act as a conductometric sensor even after prolonged exposures.

Original languageEnglish
Article number037002
Number of pages6
JournalMeasurement Science and Technology
Issue number3
Publication statusPublished - Mar 2021


  • Measurement
  • Photo-induced current
  • Transient response
  • UV sensor
  • ZnO

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