Effect of doping concentration on the properties of aluminium doped zinc oxide thin films prepared by spray pyrolysis for transparent electrode applications

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Abstract

Zinc oxide possesses many interesting properties, such as modifiable conductivity, wide band gap, high excitonic binding energy, piezo-electric polarisation and cathodoluminiscence. In this study transparent conducting aluminium doped zinc oxide (ZnO:Al) thin films were deposited on float glass substrates by tailor made spray pyrolysis with adaptation for measuring the actual temperature of the substrate surface during deposition. The films were characterised and the effect of aluminium doping concentration [Al/Zn] on their optical, electrical and structural properties was investigated as a function of aluminium doping between 0 and 10 at.%. There was widening of optical band gap with increasing doping concentration. ZnO:Al films with low resistivity of 2.8 × 10-2 Ω cm and high transmittance of over 85% at 550 nm which are crucial for opto-electrical applications were obtained at a doping ratio of 2 at.%.

Original languageEnglish
Pages (from-to)555-560
Number of pages6
JournalCeramics International
Volume37
Issue number2
DOIs
Publication statusPublished - Mar 1 2011

Fingerprint

Zinc Oxide
Spray pyrolysis
Zinc oxide
Aluminum
Oxide films
Doping (additives)
Thin films
Electrodes
Optical band gaps
Substrates
Binding energy
Structural properties
Electric properties
Energy gap
Optical properties
Polarization
Glass
Temperature

All Science Journal Classification (ASJC) codes

  • Process Chemistry and Technology
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

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abstract = "Zinc oxide possesses many interesting properties, such as modifiable conductivity, wide band gap, high excitonic binding energy, piezo-electric polarisation and cathodoluminiscence. In this study transparent conducting aluminium doped zinc oxide (ZnO:Al) thin films were deposited on float glass substrates by tailor made spray pyrolysis with adaptation for measuring the actual temperature of the substrate surface during deposition. The films were characterised and the effect of aluminium doping concentration [Al/Zn] on their optical, electrical and structural properties was investigated as a function of aluminium doping between 0 and 10 at.{\%}. There was widening of optical band gap with increasing doping concentration. ZnO:Al films with low resistivity of 2.8 × 10-2 Ω cm and high transmittance of over 85{\%} at 550 nm which are crucial for opto-electrical applications were obtained at a doping ratio of 2 at.{\%}.",
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AU - Sathiaraj, T. S.

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