Structure and Optical Properties of Polycrystalline InxSb30 – xSe70 (0 ≤ x ≤ 25) Chalcogenide Alloys

Authors	Shaveta Sharma¹, Rita Sharma¹, Praveen Kumar², R. Chander¹, R. Thangaraj¹, M. Mian¹
Affiliations	¹ Semiconductors Laboratory, Department of Physics, GND University, Amritsar 143005, India ² Department of Physics, DAV University, Sarmastpur, Jalandhar-144012, India
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Issue	Volume 8, Year 2016, Number 2
Dates	Received 12 January 2016; revised manuscript received 11 June 2016; published online 21 June 2016
Citation	Shaveta Sharma, Rita Sharma, Praveen Kumar, et al., J. Nano- Electron. Phys. 8 No 2, 02055 (2016)
DOI	10.21272/jnep.8(2).02055
PACS Number(s)	78.30.Ly, 78.40.Fy, 71.23.Cq
Keywords	Chalcogenide alloys, XRD (90) , Optical property (2) , Raman spectroscopy (18) .
Annotation	The spectroscopic studies of various physical properties of glassy and polycrystalline chalcogenide alloys are important due to their importance as active materials in various solid state devices. The composition dependence of these properties are explained on the basis of coordination number, but the splitting of this effect from the nature of additive is imperative for furthering the understanding of these systems. In the present work, the structural and spectroscopic investigations of melt quenched bulk In-Sb-Se chalcogenide alloys have been studied by XRD, RAMAN and optical spectroscopic techniques. The XRD study reveals the polycrystalline nature of the samples. The composition was analysed using the energy dispersive X-ray spectroscopy technique. The XRD study reveals the crystallization of Sb2Se3 and β-In2Se3 phases while the increase in the intensity for β-In2Se3 phase has been observed with the increase in indium content. The RAMAN spectra also reveal the formation of chalcogenide based Sb and In structural units. The diffused reflectance spectrum was used to calculate the optical absorption in 800-1500 nm spectral region and used to study the composition dependence of the optical gap in these samples. The results have been discussed in conjunction with the heterogeneous phases; density of defect states; electronegativity and average mean bond energy for these polycrystalline alloys.
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