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VOLUME 114 | ISSUE 5 | PAGE 346
Influence of cation impurities and both cation and anion nonstoichiometry on aluminum oxide energy gap width
Using the Coherent Potential Approximation, the electronic structure of α- Al2O3 (corundum) with various concentrations of mono and multi d- (Zr, Nb, Mo), p- (Ga, Sn) impurities in aluminum sublattice and vacancies in both aluminum and oxygen sublattices was calculated. It was found that an energy gap width reduction occurs due to specific filling of both new Zr, Nb, Mo d bands and oxygen vacancy s peak which appear in the gap of undoped α- Al2O3. This is in good agreement with experimental data. New d- and p-doped compositions including those nonstoichiometric in aluminum sublattice with energy gap values lying in the interval from 4.3 to 8.1 eV are proposed for advanced electronic devices. Three doped compounds having 0.4-2.1 eV energy gap widths with alternation of nonstoichiometric sublattices and number of d- and p- impurities in aluminum sublattice are found. They can be considered as promising materials for solar cells and photodiods.