Optical Properties of Ge23.5Pb20S56.5 Glassy System

Nadezhda Ivanovna Anisimova; Gennady Alekseevich Bordovsky; Rene Alejandro Castro; Lilia Ansafovna Nabiullina

doi:10.4028/www.scientific.net/KEM.723.522

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 723Optical Properties of Ge23.5Pb20S56.5 Glassy...

Optical Properties of Ge_23.5Pb₂₀S_56.5 Glassy System

Abstract:

The spectra of refractive index and absorption coefficient in thin films of Ge_23.5Pb₂₀S_56.5 glassy system were calculated on the base of analysis of transmission spectra. The refractive index has values between 2.0 and 2.6 in the spectral range between 500 nm and 1200 nm. The existence of indirect allowed transitions with energy E_g = 1.70 ± 0.01 eV and phonon energy of w_ph= 0.11 eV at room temperature was found. For values of the absorption coefficient a < 10³см ^–1 the fundamental absorption edge is described by exponential function known as Urbach-rule. The static structure disorder parameter w_o_, is equal to 0.06 eV.

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Key Engineering Materials (Volume 723)

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522-526

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https://doi.org/10.4028/www.scientific.net/KEM.723.522

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December 2016

Authors:

Nadezhda Ivanovna Anisimova, Gennady Alekseevich Bordovsky, Rene Alejandro Castro, Lilia Ansafovna Nabiullina

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Absorption Coefficient, Absorption Edge, Optical Properties, Refractive Index, Transmission Spectra, Urbach-Rule

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