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Temperature dependence of the dielectric function and critical points of ?-SnS from 27 to 350 K.

ABSTRACT: We report the temperature dependence of the dielectric function ??=??₁?+?i?₂ and critical point (CP) energies of biaxial ?-SnS in the spectral energy region from 0.74 to 6.42 eV and temperatures from 27 to 350 K using spectroscopic ellipsometry. Bulk SnS was grown by temperature gradient method. Dielectric response functions were obtained using multilayer calculations to remove artifacts due to surface roughness. We observe sharpening and blue-shifting of CPs with decreasing temperature. A strong exciton effect is detected only in the armchair direction at low temperature. New CPs are observed at low temperature that cannot be detected at room temperature. The temperature dependences of the CP energies were determined by fitting the data to the phenomenological expression that contains the Bose-Einstein statistical factor and the temperature coefficient for describing the electron-phonon interaction.

SUBMITTER: Nguyen HT

PROVIDER: S-EPMC7591561 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Temperature dependence of the dielectric function and critical points of α-SnS from 27 to 350 K.

Nguyen Hoang Tung HT Le Van Long VL Nguyen Thi Minh Hai TMH Kim Tae Jung TJ Nguyen Xuan Au XA Kim Bogyu B Kim Kyujin K Lee Wonjun W Cho Sunglae S Kim Young Dong YD

Scientific reports 20201027 1

We report the temperature dependence of the dielectric function ε = ε<sub>1</sub> + iε<sub>2</sub> and critical point (CP) energies of biaxial α-SnS in the spectral energy region from 0.74 to 6.42 eV and temperatures from 27 to 350 K using spectroscopic ellipsometry. Bulk SnS was grown by temperature gradient method. Dielectric response functions were obtained using multilayer calculations to remove artifacts due to surface roughness. We observe sharpening and blue-shifting of CPs with decreasin ...[more]

PMID: 33110190

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Temperature dependence of the dielectric function and critical points of ?-SnS from 27 to 350 K.

Publications

Temperature dependence of the dielectric function and critical points of α-SnS from 27 to 350 K.

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