Optical Properties of Thermally Deposited Bismuth Telluride in the Wavelength Range of 2.5-10 µm
A.Y. Morsya, S.S. Fouada, E. Hashemb and A.A. El-Shazlya
a)Faculty of Education, Ain Shams University, Roxy, Egypt
b)Faculty of Girls, Ain Shams University, Roxy, Egypt
Received: August 23, 1991
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The optical constants (the refractive index n, the absorption index k and the absorption coefficient α) of Bi2Te3 thin films were determined in the wave-lenght range of 2.5 to 10 µm. The shape of the absorption edge in Bi2Te3 thin films has been determined from transmittance and reflectance measurements. The edge is of the form expected for direct transition corresponding to Eg = 0.21 eV. The optical constants were used to determine the high frequency dielectric constant ε0 = 58, the optical conductivity σ =σ1 + σ2 as well as the volume and surface energy loss functions. All these parameters were used to get some information about the intraband and interband transitions.
DOI: 10.12693/APhysPolA.80.819
PACS numbers: 78.65.-s, 81.40.Tv