Galyan V. The effect of modifiers (HgSe, Cu2Se) on the physical properties of glass-like germanium diselenide

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0403U001760

Thesis Registration Form

0403U001760.pdf

Applicant for

Specialization

  • 01.04.10 - Фізика напівпровідників і діелектриків

22-05-2003

Specialized Academic Board

К.32.051.01

Essay

The thesis represents the results of the investigation of the structure and certain optical and electrical physical properties of glass-like GeSe2 alloys with HgSe and Cu2Se. Based on X-ray scattering curves the structural factor and the function of the radial distribution of atomic density of glassy HgSe-GeSe2 alloys were calculated. For the first time, the average interatomic distances and coordination numbers were calculated for these alloys. The research shows that crystalline micro-inhomogeneities exist in the alloys near the glass formation border for HgSe(52,54) modifier. It was established that the spectral dependence of optical absorption a(hn) of the alloys in the fundamental absorption region follows Urbach rule. The phenomenon of thermal-induced optical darkening in HgSe-GeSe2 alloys was discovered. Based on the temperature dependence of the conductivity s(T) the mechanism of conductivity and its change with component composition were determined.

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