Study chang thickness of thin film in electronic transition to thin film cadmium dxid

Abstract

Thin film of Cadimum oxid have been prepared by Spray Pyrolsis with different thicknesses (250,350,450)nm ,on glass substrate which were heated to (500 0C) . The polycrystalline structure of these film has been confirmed by X-ray diffraction . It has been found from optical measurement that the electronic transition are direct allowed and forbidden . Also found that the optical energy gap decreases with increasing the thickness .