Structural analysis, dielectric relaxation, and AC electrical conductivity in TlInSe2 thin films as a function of temperature and frequency

Laser-Induced Transformations in Thermally Evaporated Thin TlInSe2 Films Studied by Raman Spectroscopy

“…An intense broad band in this spectral interval is reported for amorphous In 2 Se 3 films [29]. Evidently, the reason for why, in our case, contrary to the recent studies of other groups [16,17], the thermal evaporation resulted in amorphous TlInSe 2 films, is related to the substrate temperature. The authors of Refs.…”

“…In our opinion, an even clearer evidence of the amorphous structure of the films is the frequency position of the most intense peak (near 165 cm −1 ) which, for TlInSe 2 , should be expected near 180-185 cm −1 . Note that a recent study performed for thermally evaporated polycrystalline TlInSe 2 films clearly revealed the dominant Raman peak at 181 cm −1 and a less intense feature at 169 cm −1 [17]. Likewise, the spectrum of single-crystal TlInSe 2 in 𝑍(𝑋𝑋 + 𝑋𝑌 ) Z scattering configuration exhibits the most prominent narrow peak at 185 cm −1 , a less intense maximum at 171 cm −1 , and an even weaker shoulder near 200 cm −1 (Fig.…”

“…The authors of Refs. [16,17] evaporated the films on substrates heated to 300-350 ∘ C and obtained polycrystalline TlInSe 2 films, their structure being clearly confirmed by the X-ray diffraction and Raman spectroscopy. Meanwhile, in our case, the evaporation was performed onto cold substrates, and amorphous TlInSe 2 films were obtained.…”

“…In the recent years, an additional research interest toward thin TlInSe 2 films emerged [16,17], similarly to the films of related I-III-VI 2 materials prepared mostly by the thermal evaporation [18][19][20][21][22][23][24][25][26].…”