Effect of Sn addition on the optical gap and far-infrared reflectivity spectra of amorphous Sb–Se films

Structural and spectroscopic ellipsometry studies on vacuum-evaporated Sn2m−4Sb4S2m+2 (m = 2.5, 3 and 4) thin films deposited on glass and Si substrates

“…Generally, the increase of the density of the structural units or bonds assigned to each peak increases its intensity. The same behavior was found in similar ternary systems when studying the effect of Sn addition in Sn x Sb 20 Se 80-x [40], Sn x Sb 5 Se 95-x [4] and Sn x Sb 15 Se 85-x [43]. It is relevant to notice that P. Kumar chemically, structurally, with respect to temperature and stress stability.…”

“…To assign Raman vibrations to spectral peaks, it is necessary to realize that two or more bonds which are close together in a molecule and are of similar energies can interact and it is the vibration of the group of atoms linked by these bonds which is observed in the spectrum [38]. According to the molecular model [39], each Sb atom in the Sn-Sb-S ternary compound is covalently The band situated at 163 cm -1 can be assigned to stretching modes of Sn-tetrahedral units [40,41]. Other authors reported that this peak (163 cm -1 ) corresponds to a vibration related to the presence of Sb-Sb linkages [42].…”

Structural and optical properties of Sb65Se35−xGexthin films

“…The Raman study provides valuable information on the structural modification through a systematic substitution of germanium. The vibrational bands reported in the literature for their crystalline accompaniment were taken as the reference to discuss the spectrum [18][19][20][21][22][23][24][25] Se 2 Sb-SbSe 2 structural units [18], due to the excess amount of antimony and the Se deficiency (the parameter R is less than 1; see table 1). It is interesting to note that the 192 cm −1 (see inset (B)) band is present, albeit quite weakly, even in the Raman spectrum of Sb 65 Se 30 Ge 5 .…”

Synthesis and Characterization of Sb<sub>65</sub>Se<sub>35-x</sub>Ge<sub>x</sub> Alloys

“…Raman spectra were used to obtain basic structural information. For the vibrational bands reported in the literature for their crystalline accompaniment were taken as reference for the discussion of the spectrum [37][38][39][40]. The Raman spectra of Sb 65 Se 35-x Ge x with 0 ≤ x ≤ 20, depending on composition, are depicted in Figure 3.…”