Chin. Phys. Lett.  2014, Vol. 31 Issue (06): 067401    DOI: 10.1088/0256-307X/31/6/067401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Electronic and Optic Properties of Cubic Spinel CdX2O4 (X=In, Ga, Al) through Modified Becke–Johnson Potential
A. Manzar1, G. Murtaza2**, R. Khenata3, Masood Yousaf4, S. Muhammad1, Hayatullah1
1Department of Physics, Hazara University Mansehra, KPK, Pakistan
2Materials Modeling Lab, Department of Physics, Islamia College University, Peshawar, Pakistan
3LPQ3M Laboratory, Institute of Science and Technology, University of Mascara, Algeria
4Physics Department, Faculty of Science, Universiti Teknologi Malaysia, Skudai81310, Johor, Malaysia
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A. Manzar, G. Murtaza, R. Khenata et al  2014 Chin. Phys. Lett. 31 067401
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Abstract A new potential approximation known as modified Becke–Johnson based on density functional theory is applied to compute the electronic band profile and optical response of CdIn2O4, CdGa2O4 and CdAl2O4 compounds. The direct band gap with common LDA, GGA and EV-GGA is drastically underestimated compared with modified Becke–Johnson approximation, whose results are significantly closer to the experimental findings. The optical properties like dielectric constant, refractive index, reflectivity, optical conductivity and absorption coefficient are also computed. A unique characteristic associated with cation replacement is studied; the replacement of cation In by Ga and Ga by Al significantly reduces the direct energy band gap in these compounds. This variation is of crucial importance for band gap dependent optical properties of these compounds, which is also proof for applications of these compounds in optoelectronic devices.
Published: 26 May 2014
PACS:  74.20.Pq (Electronic structure calculations)  
  74.25.Gz (Optical properties)  
  71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/6/067401       OR      https://cpl.iphy.ac.cn/Y2014/V31/I06/067401
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A. Manzar
G. Murtaza
R. Khenata
Masood Yousaf
S. Muhammad
Hayatullah
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