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Effect of Heat Treatment on the Optical Properties of Cobalt Doped Stannic Oxide

Hasan J. S.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 9

59--70

This study investigates The effect of annealing on The optical properties of (SnO2:Co) films prepared by spray pyrolysis (SP) technique at a glass substrate temperature (Ts = 773 K). The absorbance and transmittance spectra have been recorded in order to calculate the optical constant and the optical band gap energy of the films. It was found that the annealing affects all the parameters under investigations.

Structural, optical, electrical and magnetic properties of sol-gel derived Zn1-x-yCoxAlyO films

Sharma M., Mehra R. M.

Materials Science Poland

2008

Vol. 26, No. 3

659--673

A detailed study has been presented of optical, electrical, structural and magnetic properties of Zn1.xCoxO (0 < x ≤ 0.25) films co-doped with 1 at. % of Al. The polycrystalline films have been synthesized on Corning glass 7059 substrates by the sol-gel technique using spin coating. Highly preferential c-axis oriented films have been obtained at the annealing temperature of 600 ° C. The lattice constant d of c-axis wurtzite Zn1.x.yCoxAlyO obeys Vegard�fs law for (0 < x ≤ 0.25). The inclusion of Al in ZnO is highly beneficial for the magnetism in ZnO because it enhances the free electron density. Optical spectra measurements reveal that band gap energy exhibits a blue shift upon increasing Co concentration. A positive magnetoresistance for Co doped ZnO and negative magnetoresistance for ZnO without cobalt at 77 K has been observed. The ferromagnetic behaviour has been confirmed by measurements using superconducting quantum interference device. The coercive field and the remanence increase with increase in Co content.