| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Theoretical investigation of optical properties and band gap engineering for Zn1-xTMxTe(TM=Fe, Co) alloys by modified Becke—Johnson potential |
| Q Mahmood1, M Yaseen2, M Hassan1, Shahid M Ramay3, Asif Mahmood4 |
1 Materials Growth and Simulation Laboratory, Department of Physics, University of the Punjab, Quaid-i-Azam Campus, 54590, Lahore, Pakistan;
2 Department of Physics, University of Agriculture University, Faisalabad 38040, Pakistan;
3 Physics and Astronomy Department, College of Science, King Saud University, Riyadh, Saudi Arabia;
4 Chemical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia |
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Abstract The direct band gap ZnTe with transition metal (TM) impurities plays a vital role in optoelectronic and spintronic applications. In the present study, we use the advanced modified Becke-Johnson (mBJ) functional for performing the structural computations and detailed investigations of the optical characters in Zn1-xTMxTe (TM=Fe, Co) alloys with 0 ≤ x ≤1. By employing the FP-LAPW method, we determine various optical parameters for the ternary alloys and for the end binaries. The calculated static dielectric constants and optical band gaps for Zn1-xTMxTe (TM=Fe, Co) have an inverse relation that verifies the Penn model. We find that the static dielectric constant is nearly equal to the square of the static refractive index, and both increase with TM content. Furthermore, we also find a slight shift of peaks to a higher energy region with increasing TM concentration. The decreasing band gap and high value of the absorption in the visible region of electromagnetic spectrum make these alloys suitable for photonic and solar cell applications.
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Received: 01 February 2017
Revised: 01 April 2017
Accepted manuscript online:
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PACS:
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78.66.Jg
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(Amorphous semiconductors; glasses)
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| Fund: Project supported by the Deanship of Scientific Research at King Saud University (for Shahid M Ramay) (Grant No. RG 1435-004), the University of the Punjab, Lahore for financial support through Faculty Research Grant Program (for M Hassan), and the HEC Pakistan (Grant No. 21-261/SRGP/R&D/HEC/2014) (for M Yaseen). |
Corresponding Authors:
M Yaseen
E-mail: myaseen_taha@yahoo.com
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| About author: 0.1088/1674-1056/26/8/ |
Cite this article:
Q Mahmood, M Yaseen, M Hassan, Shahid M Ramay, Asif Mahmood Theoretical investigation of optical properties and band gap engineering for Zn1-xTMxTe(TM=Fe, Co) alloys by modified Becke—Johnson potential 2017 Chin. Phys. B 26 087803
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