"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Molecular structure of Se-rich amorphous films

V. I. MIKLA1,* , V. V. MIKLA1

Affiliation

  1. Institute for Solid State Physics and Chemistry, Uzhgorod National University, Uzhgorod, Voloshina St. 54, Ukraine

Abstract

Structure and its transformation are examined for amorphous Se-rich AsxSe1-x (0≤x≤0.2) alloys by employment of diffraction and non-diffraction structural probes. It is shown that the molecular structure of amorphous Se (a-Se) on the scale of shortrange order is close to that of crystalline phase, while medium-range order differs from the structure of most inorganic glasses and may be placed between three-dimensional network glasses and polymeric ones. Further experiments show the existence of successive phases in laser-induced glass-crystalline transition with pronounced threshold behavior. Below the energy density threshold, Eth, only small changes in the local structure of the system can be detected. Above Eth, the changes were attributed to crystallization transformation. The corresponding Raman spectra reveal transformation of the system from amorphous into the crystalline phase under laser irradiation. In the binary AsxSe1-x glass system, a change of structural regime takes place near the composition x ≈ 0.04. The presence of this topological threshold is established by direct and indirect evidence, such as peculiarities in the composition dependence of the basic parameters for electron diffraction and Raman vibrational modes. The peculiarities are caused by the transition from a chain-ring-like structure to chain-like structure..

Keywords

Chalcogenide, Amorphous, Structure, Se-based materials.

Submitted at: Sept. 6, 2010
Accepted at: Sept. 15, 2010

Citation

V. I. MIKLA, V. V. MIKLA, Molecular structure of Se-rich amorphous films, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 9, pp. 1827-1839 (2010)