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Electronic Structure of Al2O3 Thin Film Studied Using First-Principle Band Calculation

The electronic structures of Al2O3 thin film are calculated within the framework of the local density approximation using the full-potential-linearized augmented-plane-wave method, for comparison to those of the bulk. The band gap of Al2O3 thin film is about 2.6 eV, which is much smaller than that of the bulk (∼6.6 eV). It is found that Al2O3 thin film is not a good insulator.