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Valanarasu S.,Arul Anandar College Karumathur | Dhanasekaran V.,Aristotle University of Thessaloniki | Karunakaran M.,Sethupathi Government Arts College | Vijayan T.A.,Sree Sevugan Annamalai College | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2014

In the present study, we have reported on the effect of annealing time variations for spin coated magnesium oxide (MgO) thin films. The various time annealed MgO thin films structural, surface morphological, compositional, electrical and optical absorption properties were studied by X-ray diffraction, scanning electron microscopy, energy dispersive analysis by X-rays, I-V studies and UV-vis spectroscopy, respectively. The cubic structure formation with preferential orientation along the (200) plane was confirmed from structural analysis. In addition, the influence of the annealing on the microstructural properties of MgO was plausibly explained. The optical properties of MgO thin films were estimated using the transmission spectrum in the range of 400-800 nm. The optical band gap energy of MgO thin films was found to be in the range between 3.81 and 3.93 eV. The morphological studies depicted that the spherical and ellipsoid shaped grains were distributed evenly over the entire surface of the film. The sizes of the grains are found to be in the range between 200 and 250 nm. The composition analysis was performed by EDX for various temperatures annealed MgO thin films. © 2014 Springer Science+Business Media New York. Source


Jeice A.R.,Annai Velankannai College | Wilson K.S.J.,Arul Anandar College Karumathur
Indian Journal of Physics | Year: 2014

The confined energy and its interaction effects in a spherical quantum dot are calculated using the perturbation method within effective mass approximation. The interaction energy is computed for GaAs/Ga x In 1-x Sb as a function of the dot size. Results are presented for the spherical quantum dot with square well confinement corresponding to different values of x. Our result shows that confined energies and interaction energies decrease as the dot size increases. Interaction energies contribute 6-10 % in singlet state and 4-8 % in triplet state to total confined energy of lower dot radii. All calculations are carried out with finite models and the results are compared with existing literature data. © 2014 Indian Association for the Cultivation of Science. Source

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