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The thermal stability of sol–gel p-type Al–N codoped ZnO films was investigated by high-resolution X-ray photoelectron spectroscopy (XPS). XPS revealed the chemical bonding states and solubility of N-related complex defects in the ZnO films. The concentrations of N O and (NC) O varied with annealing temperature, which led to the change in conduction between p-type and n-type. Variable-temperature...
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