Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations
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2014
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my.unimap-361512014-07-10T06:49:48Z Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations Ali Hussain, Reshak, Prof. Dr. Khyzhun, Oleg Yu Kityk, Iwan V. Fedorchuk, A. O. Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Auluck, Sushil, Dr. Parasyuk, Oleg V. maalidph@yahoo.co.uk Chalcogenide Quaternary Sulfides DFT XPS XRD Link to publisher's homepage at http:///www.aspbs.com/sam Ag₂In₂GeS₆ and Ag₂InSiS₆ are two interesting quaternary-sulfide single crystals. Starting from our previous investigation on Ag₂In₂GeS₆ single crystals, the Ag₂In₂SiS₆ is investigated here. We demonstrate the effect of replacing Ge by Si on the electronic structure and the bonding properties. We have used X-ray diffraction (XRD) data for Ag₂In₂Ge(Si)S₆ single crystals as input to our theoretical calculations using the all-electron full potential linearized augmented plane wave method to solve the Kohn Sham Density Functional Theory (DFT) equations. As remarkable finding, our calculations show that, on replacing Ge by Si atom, the environment of the S atoms is changed significantly. The energy gap depends on the exchange correlation function. For the local density approximation (LDA) the energy gap is 0.76 eV, while, based on the modified Becke-Johnson approximation (mBJ), the energy gap increases to 1.98 eV. We should emphasize that this energy gap in Ag₂In₂SiS₆ is almost the same as that obtained for Ag₂In₂GeS₆ (1.96 eV). Another significant finding is that when we replace Ge by Si the conductions bands move away from the Fermi energy while the valence bands are almost unchanged. In order to support the theoretical calculation the calculated total density of states below EF (TDOS-VB) of Ag₂In₂SiS6 single crystals is compared with our experimentally measured valence-band X-ray photoelectron spectroscopy (XPS-VB). The theoretical spectrum reproduces the general features structure of the measured XPS-VB faithfully. 2014-07-10T06:49:48Z 2014-07-10T06:49:48Z 2013-04 Article Science of Advanced Materials, vol.5 (4), 2013, pages 316-327 1947-2935 http://dspace.unimap.edu.my:80/dspace/handle/123456789/36151 http://www.ingentaconnect.com/content/asp/sam/2013/00000005/00000004/art00002 http://dx.doi.org/10.1166/sam.2013.1460 en American Scientific Publishers |
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Chalcogenide Quaternary Sulfides DFT XPS XRD |
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Chalcogenide Quaternary Sulfides DFT XPS XRD Ali Hussain, Reshak, Prof. Dr. Khyzhun, Oleg Yu Kityk, Iwan V. Fedorchuk, A. O. Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Auluck, Sushil, Dr. Parasyuk, Oleg V. Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
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Link to publisher's homepage at http:///www.aspbs.com/sam |
| author2 |
maalidph@yahoo.co.uk |
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maalidph@yahoo.co.uk Ali Hussain, Reshak, Prof. Dr. Khyzhun, Oleg Yu Kityk, Iwan V. Fedorchuk, A. O. Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Auluck, Sushil, Dr. Parasyuk, Oleg V. |
| format |
Article |
| author |
Ali Hussain, Reshak, Prof. Dr. Khyzhun, Oleg Yu Kityk, Iwan V. Fedorchuk, A. O. Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Auluck, Sushil, Dr. Parasyuk, Oleg V. |
| author_sort |
Ali Hussain, Reshak, Prof. Dr. |
| title |
Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
| title_short |
Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
| title_full |
Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
| title_fullStr |
Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
| title_full_unstemmed |
Electronic structure of quaternary chalcogenide Ag₂In₂Ge(Si)S₆ single crystals and the influence of replacing Ge by Si: Experimental X-ray photoelectron spectroscopy and X-ray diffraction studies and theoretical calculations |
| title_sort |
electronic structure of quaternary chalcogenide ag₂in₂ge(si)s₆ single crystals and the influence of replacing ge by si: experimental x-ray photoelectron spectroscopy and x-ray diffraction studies and theoretical calculations |
| publisher |
American Scientific Publishers |
| publishDate |
2014 |
| url |
http://dspace.unimap.edu.my:80/dspace/handle/123456789/36151 |
| _version_ |
1643798027788353536 |