CaO super cell with and without oxygen defects have been constructed. The Generalized Gradient Approximation (GGA) exchange correlation with PBE functional has been taken to analyze its structural, electrical and optical properties. It was observed that with the increase of oxygen vacancy decreases the stability. The density of states (DOS) reveals that the donor level was increased with increase of oxygen vacancy in the super cell. The band structure analysis shows that the removal of oxygen or oxygen defect in the super cell tends to decrease the band gap. The optical absorption coefficient values of super cell decreases with the increase of oxygen vacancies. The electronic properties are discussed in terms of HOMO-LUMO energy gap, ionization potential and electron affinity.
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