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The optical anisotropy of the Sb 2 Se 3 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 Sb 2 Se 3 single crystals and in the photoelectric spectra of the Me-Sb 2 Se 3 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 ( m  c  * = 0.67 m  0 ) as well as the holes at the four top valence bands ( m  v1  * = 3.32 m  0 , m  v2  * = 3.83 m  0 , m  v3  * = 3.23 m  0 and m  v4  * = 3.23 m  0 ) were calculated in the Г-point of the Brillouin zone. The magnitude of the valence band splitting V 1 -V 2 due to the spin-orbit interaction (Δ so = 35 meV) and the crystal field (Δ cf = 13 meV) were estimated in the Brillouin zone center. The energy splitting between the bands V 3 -V 4 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 ( Рnma ). The photoelectric properties of the Me-Sb 2 S 3 structures were investigated in the spectral range 1-1.8 eV under E ||c and E ⟂c polarization conditions and at different applied voltages.

Excitonic and electronic transitions in Me–Sb2Se3 structures

Excitonic and electronic transitions in Me–Sb₂Se₃ structures