Díaz-Martínez, Ramón D.

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Synthesis of CuAlO2 thin films by pulsed laser deposition
(2009) Díaz-Martínez, Ramón D.; Fernández, Félix E.; College of Arts and Science - Science; Radovan, Henri; Liu, Huimin; Department of Physics; Romañach, Rodolfo
This work presents a procedure that has never been published before for producing transparent CuAlO2 thin films. Pulsed laser deposition was used to fabricate films composed of a mixture of Cu2O and Al2O3 in a proportion stoichiometric to CuAlO2. Samples were then heat treated using a system designed for rapid thermal annealing in order to achieve complete reaction of the two compounds. It was found that deposited films require a heating ramp rising from room temperature up to 1050°C in the order of seconds, and dwell times at this temperature in the order of minutes. Films fabricated by this procedure are single-phase CuAlO2, and have conductivities of up to 0.017 S/cm. The material was found to have grown epitaxially oriented on sapphire substrates by off-plane XRD analysis, and a suitable model for this interface has been proposed.