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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Controlling preferred orientation and electrical conductivity of zinc oxide thin films by post growth annealing treatment
Applied Surface Science, Volume 367, Year 2016
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Description
We report the microstructural evolution of the preferred orientation and electrical conductivity of zinc oxide (ZnO) thin films prepared by ion beam sputtering. Elastic recoil detection analysis results showed 0.6 at% H in as-deposited film which decreased to 0.35 at% in air annealed film due to H diffusion. XRD results showed that the preferred orientation can be tuned by selecting annealing conditions. Vacuum annealed films exhibited (1 0 0) orientation, whereas air annealed film showed (0 0 2) orientation. The annealing conditions caused a dramatic increase in the resistivity of air annealed films (∼10 6 Ω cm), whereas vacuum annealed films showed lower resistivity (∼10 -2 Ω cm). High resistivity in air annealed film is attributed to the lack of hydrogen interstitials and hydrogen-oxygen vacancy complexes. Raman results supported the XRD results which demonstrated that annealing assisted in recovery of the crystalline disorder in as-deposited films. Air annealed film exhibited the highest optical transmission (89.7%) in the UV-vis region compared to as-deposited and vacuum annealed films (∼85%). Optical bandgap was found to vary between 3.11 eV and 3.18 eV in as-deposited and annealed films, respectively. The bandgap narrowing is associated with the intrinsic defects which introduced defect states resulting in band tail in ZnO films. © 2016 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Kennedy, John Vedamuthu
New Zealand, Lower Hutt
Gns Science
New Zealand, Wellington
Macdiarmid Institute for Advanced Materials and Nanotechnology
Murmu, Peter Paul
New Zealand, Lower Hutt
Gns Science
Markwitz, A.
New Zealand, Lower Hutt
Gns Science
New Zealand, Wellington
Macdiarmid Institute for Advanced Materials and Nanotechnology
Futter, John
New Zealand, Lower Hutt
Gns Science
Statistics
Citations: 228
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/j.apsusc.2016.01.160
ISSN:
01694332
Research Areas
Environmental