Excitonic and electronic transitions in Me-Sb2Se3 structures
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SYRBU, Nicolae, ZALAMAI, Victor, STAMOV, Ivan, BERIL, Stephan. Excitonic and electronic transitions in Me-Sb2Se3 structures. In: Beilstein Journal of Nanotechnology, 2020, vol. 11, pp. 1045-1053. ISSN 2190-4286. DOI: https://doi.org/10.3762/bjnano.11.89
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Beilstein Journal of Nanotechnology
Volumul 11 / 2020 / ISSN 2190-4286

Excitonic and electronic transitions in Me-Sb2Se3 structures

DOI: https://doi.org/10.3762/bjnano.11.89

Pag. 1045-1053

Syrbu Nicolae1, Zalamai Victor1, Stamov Ivan2, Beril Stephan2
 
1 Technical University of Moldova,
2 T.G. Shevchenko State University of Pridnestrovie, Tiraspol
 
Disponibil în IBN: 9 decembrie 2020


Rezumat

The optical anisotropy of the Sb2Se3 crystals was investigated at 300 and 11 K. Excitonic features of four excitons (A, B, C, and D) were observed in the optical spectra of the Sb2Se3 single crystals and in the photoelectric spectra of the Me-Sb2Se3 structures. The exciton parameters, such as the ground (n = 1) and excited (n = 2) state positions and the binding energy (Ry), were determined. The effective mass of the electrons at the bottom of the conduction band (mc* = 0.67m0) as well as the holes at the four top valence bands (mv1* = 3.32m0, mv2* = 3.83m0, mv3* = 3.23m0 and mv4* = 3.23m0) were calculated in the Γ-point of the Brillouin zone. The magnitude of the valence band splitting V1-V2 due to the spin-orbit interaction (Δso = 35 meV) and the crystal field (Δcf = 13 meV) were estimated in the Brillouin zone center. The energy splitting between the bands V3-V4 was 191 meV. The identified features were discussed based on both the theoretically calculated energy band structure and the excitonic band symmetry in the Brillouin zone (k = 0) for crystals with an orthorhombic symmetry (Pnma). The photoelectric properties of the Me-Sb2S3 structures were investigated in the spectral range 1-1.8 eV under E||c and Elc polarization conditions and at different applied voltages.

Cuvinte-cheie
Anisotropy, antimony triselenide, Band structure, Excitons, Optical, Reflection and absorption spectra, spectroscopy