Wet-chemical dip-coating preparation of highly oriented copper-aluminum oxide thin film and its opto-electrical characterization

Title
Wet-chemical dip-coating preparation of highly oriented copper-aluminum oxide thin film and its opto-electrical characterization
Author(s)
주상우바너지나라얀차토파드햐이[차토파드햐이]
Keywords
LOW-TEMPERATURE SYNTHESIS; SOL-GEL; THERMOELECTRIC PROPERTIES; DELAFOSSITE CUALO2; ELECTRICAL-PROPERTIES; OPTICAL-PROPERTIES; HIGH-CONDUCTIVITY; VAPOR-DEPOSITION; AL; SEMICONDUCTOR
Issue Date
201101
Publisher
ELSEVIER SCIENCE BV
Citation
PHYSICA B-CONDENSED MATTER, v.406, no.2, pp.220 - 224
Abstract
Transparent p-type semiconducting copper aluminum oxide thin film has been synthesized by a wet-chemical route. CuCl and AlCl3, dissolved in HCl, are taken as starting materials. pH value of the solution is controlled by adding a measured amount of NaOH into it. Films are deposited by dip-coating technique on glass and Si substrates followed by annealing in air at 500 degrees C for 3 h. XRD pattern confirms the crystalline CuAlO2 phase formation in the film and also indicates a strong (0 0 6) orientation. UV-vis spectrophotometric measurements show high transparency of the film in the visible region with a direct allowed bandgap of 3.94 eV. Electrical measurements depict the thermally activated conduction within the films. Thermoelectric measurements confirm the p-type nature of the films. Compositional analysis shows the presence of excess (nonstoichiometric) oxygen within the material, which is incorporated during the air-annealing of the film. According to defect equilibrium, this excess oxygen is predicted to cause the p-type conductivity of the film. This type of cost-effective solution-based technique is very useful for volume production of this kind of technologically important material for transparent electronic and other diverse applications. (C) 2010 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/25801http://dx.doi.org/10.1016/j.physb.2010.10.047
ISSN
0921-4526
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공과대학 > 기계공학부 > Articles
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