Ahmad, M.; Thangaraj, R.; Sathiaraj, T.S.(Springer, NaN, 2010)
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Abstract:
Bulk samples of Sn10Sb20-xBixSe70 (0 B x B 8)
chalcogenide alloys were prepared by the conventional melt quenching technique. Thin films were prepared on wellcleaned
glass substrates by thermal evaporation technique. X-ray diffraction studies revealed that the alloys with x = 0
and 2 at.% of Bi were amorphous, whereas the alloys with x = 4, 6, 8 at.% were crystalline. The crystalline phases are identified as due to the formation of Bi2Se3 and BiSe2 phases.
The microstructural and differential scanning calorimetric
studies show the presence of these phases. A simple, straight forward procedure suggested by Swanepoel has been used to
calculate the optical parameters, refractive index, and extinction coefficient. The optical gap for all the samples has
been obtained from the Tauc plots. The variation in optical
parameters for different Bi concentration has been explained
on the basis of presence of defect states and the change in
stoichiometry with the change in Bi concentration.
Description:
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