Article ID Journal Published Year Pages File Type
1496843 Optical Materials 2007 5 Pages PDF
Abstract

InSe thin films are obtained by evaporating InSe crystal onto ultrasonically cleaned glass substrates under pressure of ∼10−5 Torr. The structural and compositional analysis revealed that these films are of amorphous nature and are atomically composed of ∼51% In and ∼49% Se. The reflectance and transmittance of the films are measured at various temperatures (300–450 K) in the incident photon energy range of 1.1–2.1 eV. The direct allowed transitions band gap – calculated at various temperatures – show a linear dependence on temperature. The absolute zero value band gap and the rate of change of the band gap with temperature are found to be (1.62 ± 0.01) eV and −(4.27 ± 0.02) × 10−4 eV/K, respectively. The room temperature refractive index is estimated from the transmittance spectrum. The later analysis allowed the identification of the static refractive index, static dielectric constant, oscillator strength and oscillator energy.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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