Evaluation of thermodynamic and kinetic stability of P-type transparent conducting oxide, SrCu _2O _2 under various oxygen partial pressures (Conference Paper)

摘要

Kinetic stability of transparent p-type conducting oxide, SrCu _2O _2, has been evaluated by using X-ray diffraction measurement and thermogravimetry. It was revealed that SrCu _2O _2 decomposed to mixture of CuO and Sr _(14)Cu _(24)O _(41) in air at temperatures above 300 °C. The decomposition reaction rate can be successfully explained by kinetic model assuming first-order chemical reaction. The rate constant can be suppressed with decreasing temperature and oxygen partial pressure. The activation energy for decomposition reaction of SrCu _2O _2 calculated from Arrhenius plot was 66 kJ/mol, which was lower than those of other transparent p-type semiconductors such as CuAlO _2 and CuGaO _2. The low decomposition temperature and activation energy for decomposition indicate that chemical stability of SrCu _2O _2 is far lower than those of other p-type conducting oxides.