Abstract

This paper studies the dc and ac impedance behaviour of undoped ZnO thin films produced by spray pyrolysis and rf magnetron sputtering under UV light illumination, at room temperature, emphasising the role that the crystallite size, structure, surface morphology and the state of surface have on the electrical responsivities obtained. The results achieved show that the sputtered films with crystal sizes of about 4 nm exhibit dc electrical UV responsivities of 10(8). On the other hand, the spray pyrolysis films exhibit the lowest dc responsivities, due the high crystal sizes and state of surface contamination, to which very good capacitance responses were obtained, mainly due to the degree of porosity exhibit by these films when produced at low temperatures. Based on that, a two-phase electrical model is proposed to explain the set of behaviours observed. (c) 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalMaterials Science And Engineering B-Advanced Functional Solid-State Materials
Volume118
Issue number1-3
DOIs
Publication statusPublished - 25 Apr 2005

Keywords

  • Spectroscopy
  • zinc oxide
  • Amorphous silicon

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