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Optical Properties of Thermally Deposited Bismuth Telluride in the Wavelength Range of 2.5-10 µm

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Morsy A., Fouad S., Hashem E., El-Shazly A.

Acta Physica Polonica A

1991

vol. 80

issue 6

819-825

The optical constants (the refractive index n, the absorption index k and the absorption coefficient α) of Bi_{2}Te_{3} thin films were determined in the wave-lenght range of 2.5 to 10 µm. The shape of the absorption edge in Bi_{2}Te_{3} thin films has been determined from transmittance and reflectance measurements. The edge is of the form expected for direct transition corresponding to E_{g} = 0.21 eV. The optical constants were used to determine the high frequency dielectric constant ε_{0} = 58, the optical conductivity σ =σ_{1} + σ_{2} 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.

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1 Acta Physica Polonica A

1 1991

1 El-Shazly A.

1 Fouad S.

1 Hashem E.

1 Morsy A.

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Optical Properties of Thermally Deposited Bismuth Telluride in the Wavelength Range of 2.5-10 µm