Responsivity of In/ZnO nanoparticles/In and In/Ti0.05Zn0.95O nanoparticles/In devices to solar irradiation

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Abstract

The effect of the incorporation of Ti into ZnO nanoparticles on the responsivity of In/ZnO nanoparticles/In devices to solar irradiation is studied. The dependence of the sensitivity to solar irradiation, response time, grain size, luminescence and defects upon the addition of Ti is determined. The time-resolved photocurrent plot indicates that the rise and decay processes become faster when Ti is incorporated into ZnO nanoparticles. The ratio of photocurrent-to-dark current (i.e., photosensitivity) is about one order of magnitude for In/ZnO nanoparticles/In devices. However, the ratio of photocurrent-to-dark current is three-four orders of magnitude for In/TiZnO nanoparticles/In devices. An oxygen vacancy-related band model is proposed to describe the transition processes for free carrier generation. The incorporation of Ti into ZnO nanoparticles leads to the combined effect of a reduction in the grain size and the reduced number of oxygen vacancies, which serves to reduce the dark current and increase the value of photosensitivity.

Original languageEnglish
Pages (from-to)62-67
Number of pages6
JournalSensors and Actuators, A: Physical
Volume260
DOIs
Publication statusPublished - 2017 Jun 15

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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