Characterization of Bismuth Telluride thin films — Flash evaporation method

Investigation of the optical properties of PLD-grown Bi<inf>2</inf>Te<inf>3</inf> and Sb<inf>2</inf>Te<inf>3</inf>

“…Our measurements also support the transmittance spectra of Bi 2 Te 3 thin films reported by J. Dheepa et al [9]. The high absorbance in the UV region appears to be due to the high energy of the UV radiation, since this behavior is consistent in all films.…”

“…J. Dheepa et al [9] plotted the transmittance spectra of Bi 2 Te 3 thin films, and Biljana Pejova and Ivan Grozdanov [10] plotted the transmittance spectra of Bi 2 Se 3 in UV-Vis region. K.Rajasekar et al [11] studied the transmittance spectra of the Sb 2 Te 3 thin films in the visible region.…”

Influence of doping on structural and optical properties of Bi2Te3 thin films

“…As seen in Fig. 7, the films exhibit considerable absorption throughout the measured range of wavelengths which is in agreement with the literature [12]. Moreover, Se and Fe doped films follow similar trend in this wavelength range.…”

“…8(b), both extinction coefficient and refractive index vary with films thickness and doping. Extinction coefficients and refractive indices are relatively high compared to the data reported by Dheepa [12], due to the optically thick films [27], and increase with wavelength for Se and Fe doped films of 150 nm thickness ( Fig. 8(a)) which is in accord with the literature [12,27,28].…”

“…Currently, there are a number of techniques that are available to deposit Bi-Te films, such as evaporation [10][11][12][13][14], co-sputtering [15], flash evaporation [16], co-evaporation, hydrothermal [17], electrochemical deposition [18], Metal Organic Chemical Vapor Deposition [19], and Molecular Beam Epitaxy [20][21][22]. The thickness dependency [10,11,13] as well as the effects of substrate temperature [12,14,15] and real ( r ) and imaginary ( i ) parts of the complex dielectric constants were calculated using transmittance data and the results are reported here.…”