Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

Sumita Choudhary; J. V. N. Sarma; Surojit Pande; Soraya Ababou-Girard; Pascal Turban; Bruno Lepine; Subhashis Gangopadhyay

doi:10.1063/1.5028407

journal article Open Access May 01, 2018

Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

Sumita Choudhary J. V. N. Sarma Surojit Pande

Soraya Ababou-Girard Pascal Turban Bruno Lepine Subhashis Gangopadhyay

AIP Advances Vol. 8 No. 5 · AIP Publishing

View at Publisher Save 10.1063/1.5028407

Abstract

Controlled thermal oxidations of thin copper films at relatively lower temperatures (up to 500°C) leading towards the formation of a single phase of copper oxide are investigated where the oxidation temperature, duration, oxygen partial pressure, film thickness and the crystallographic orientations play very crucial roles to significantly control the final phase of the copper oxide. Thin Cu films of thicknesses 100-1000 nm were deposited on glass and silicon substrates using the vacuum assisted thermal evaporation technique. Oxidations of those Cu films were performed at different temperatures for variable durations in air ambient as well as oxygen ambient conditions. Four probe resistivity measurement, x-ray diffraction (XRD), Raman spectroscopy, ultraviolet–visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM) and x-ray photoemission spectroscopy (XPS) techniques have been used to characterize the oxide films. At a thermodynamic equilibrium, it has been observed that the oxide phase is solely determined by the oxidation temperature, however, the oxygen partial pressure can significantly alter this temperature range. In case of thermal oxidation in air, the initial oxidation of the copper films starts at about 150 °C, but a well ordered crystalline phase of the cuprous oxide (Cu2O) is observed only above 200 °C. However, the cupric oxide (CuO) phase starts to appear only above 320 °C. The details of the oxidation mechanism of the Cu film are explained with a probable schematic model in terms of thermal diffusion as well as the chemical reactivity.

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Details

Published: May 01, 2018
Vol/Issue: 8(5)
License: View

Authors

S

Sumita Choudhary

Department of Physics, Birla Institute of Technology and Science, (BITS) Pilani 1 , Rajasthan 333031, India

J

J. V. N. Sarma

Department of Physics, Birla Institute of Technology and Science, (BITS) Pilani 1 , Rajasthan 333031, India

S

Surojit Pande

Department of Chemistry, Birla Institute of Technology and Science, (BITS) Pilani 2 , Rajasthan 333031, India

S

Soraya Ababou-Girard

IPR, UMR 6251, CNRS-Université de Rennes I, Campus de Beaulieu 3 , 35042 Rennes, France

P

Pascal Turban

IPR, UMR 6251, CNRS-Université de Rennes I, Campus de Beaulieu 3 , 35042 Rennes, France

B

Bruno Lepine

IPR, UMR 6251, CNRS-Université de Rennes I, Campus de Beaulieu 3 , 35042 Rennes, France

S

Subhashis Gangopadhyay

Department of Physics, Birla Institute of Technology and Science, (BITS) Pilani 1 , Rajasthan 333031, India

Cite This Article

Sumita Choudhary, J. V. N. Sarma, Surojit Pande, et al. (2018). Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase. AIP Advances, 8(5). https://doi.org/10.1063/1.5028407

Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

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