Oxide films of copper prepared by the oxidation of copper sulphide films
Copper sulphide films prepared by reactive evaporation, when heated in air at 500 K, oxidized to Cu2O after a series of intermediate chemical transitions. Golden yellow coloured Cu2O films showed a large absorption before the fundamental absorption edge. The optical band gap was found to be (2.29±0.02)eV. When these Cu2O films were further heated they got converted to CuO and the optical band gap was found to be (2.17±0.02)eV.
KeywordsThin films optical properties oxidation high temperature treatment
PACS Nos78.66 81.60
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