Photoconductivity properties of silver-doped zinc oxide films

The transient photoconductivity of as-deposited and annealed in air 0.27 at.% silver-doped zinc oxide films (Ag:ZnO) coated on sapphire substrates by e -beam evaporation method was measured in the dark ( σ d ) and under light from a solar simulator ( σ ph ) at temperatures 8, 12, and 32 °C. In compa...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2021-09, Vol.127 (9), Article 727
Main Authors: Hovsepyan, R., Ayvazyan, O., Aghamalyan, N., Poghosyan, A., Petrosyan, S., Harutyunyan, V., Kafadaryan, Y.
Format: Article
Language:English
Subjects:
Annealing
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Electron beams
Frequency ranges
Machines
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Oxide coatings
Physics
Physics and Astronomy
Processes
Room temperature
Sapphire
Silver
Substrates
Surfaces and Interfaces
Thin Films
Transient photoconductivity
Zinc oxide
Zinc oxides
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Summary:The transient photoconductivity of as-deposited and annealed in air 0.27 at.% silver-doped zinc oxide films (Ag:ZnO) coated on sapphire substrates by e -beam evaporation method was measured in the dark ( σ d ) and under light from a solar simulator ( σ ph ) at temperatures 8, 12, and 32 °C. In comparison with as-deposited Ag:ZnO film, the annealed film exhibits lower photoresponse which decreases and becomes slower as the temperature increases from 8 to 32 °C. The ln σ d versus 1/ T plots of the as-deposited and annealed samples revealed thermally-activated process in the range of 5–60 °C for σ d with an activation energy of 1.4 eV and 0.8 eV, respectively. Furthermore, σ d and σ ph were measured in the frequency range of 10–35 × 10 6  s −1 at room temperature. σ d of the as-deposited film is frequency independent, while σ d of the annealed film exhibits two different conduction mechanisms; one dominates in the low-frequency region as conduction via delocalized states, and the other is the polaron mechanism, which is activated at higher frequencies ( ω  > 190 × 10 3  s −1 ). The frequency dependences of σ ph of the as-deposited and annealed films obey the Drude model of conductivity.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-021-04806-0