Urbach absorption edge and disordering processes in As2S3 thin films

• Published in: Journal of non-crystalline solids Vol. 357; no. 22-23; pp. 3866 - 3869
• Main Authors: STUDENYAK, I. P, KRANJCEC, M, POP, M. M
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 15.11.2011
• Subjects: Annealing; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Dispersions; Exact sciences and technology; Glass; Glasses (including metallic glasses); Materials science; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical data processing; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Refractive index; Refractivity; Specific materials; Spectra; Thin films; Treatment of materials and its effects on microstructure and properties; Temperature dependence; Urbach absorption edge; Annealing; Amorphous thin film; Refractive index; Glass; Dispersions; Coatings; Thin films; Optical spectroscopy; Optical properties; Films and coatings; Urbach rule; Absorption spectra; Optical absorption; Optical spectrum; Absorption edge
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2011.07.032

The temperature studies of transmission spectra for as-deposited and annealed amorphous As2S3 thin films are carried out. The optical absorption spectra in the range of their exponential behaviour are analysed, and the dispersion dependences of refractive index as well as their temperature variation are investigated. The Urbach behaviour of optical absorption edge is revealed, the Urbach absorption edge parameters are determined, and their temperature dependences are studied. The effect of different type of disordering on the optical absorption processes in As2S3 thin films is studied. A comparative analysis of Urbach absorption edge parameters of As2S3 bulk glasses and thin films is performed.