| Conţinutul numărului revistei |
| Articolul precedent |
| Articolul urmator |
 717 0 |
 SM ISO690:2012RUSU, Emil, SYRBU, Nicolae, TIRON, Andrew, ZALAMAI, Victor. Band structure and optical constants of SnS 2 single crystals. In: Materials Research Express, 2019, nr. 4(6), p. 0. ISSN -. |
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 Materials Research Express |
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| Numărul 4(6) / 2019 / ISSN - /ISSNe 2053-1591 | ||||||
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Absorption (K), reflection (R) and wavelength modulated transmission (δT/δλ) spectra in SnS 2 crystals of hexagonal phase (space group P6 3 /mmc) were investigated in temperature interval from 300 to 10 K. It was established that indirect band gap (E g ind - 2.403 eV) is due to unpolarized indirect transitions between Γ and Mpoints of Brillouin zone. A minimal direct band gap (E g dir - 2.623 eV) in E||b polarization is formed by direct allowed transitions and in E⊥b polarization (2.698 eV) by forbidden transitions in Γ point of Brillouin zone. A magnitude of refractive index (n) changes from 3 to 4 and has a maximum at 2.6 eV. Optical functions (n, k, ϵ 1 and ϵ 2 ) in energy region E>E g (3-V6.5 eV) were calculated from measured reflection spectra by Kramers-Kronig analysis. Features observed in reflection and optical function spectra were assigned to electron transitions. This electron transitions were localized in framework of theoretically calculated band structure. |
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| Cuvinte-cheie absorption, Electronic band structure, Layered SnS2 crystals, Optical functions, Reflection and transmission spectra |
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