Оptical properties and electronic band structure of SnS single crystals
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ZALAMAI, Victor; RUSU, Emil; SYRBU, Nicolae; TIRON, Andrew. Оptical properties and electronic band structure of SnS single crystals. In: Physica B: Condensed Matter. 2019, nr. 575, p. 0. ISSN -.
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Physica B: Condensed Matter
Numărul 575 / 2019 / ISSN - /ISSNe 0921-4526

Оptical properties and electronic band structure of SnS single crystals


DOI: 10.1016/j.physb.2019.411712
Pag. 0-0

Zalamai Victor1, Rusu Emil2, Syrbu Nicolae1, Tiron Andrew1
 
1 Technical University of Moldova,
2 Ghitu Institute of Electronic Engineering and Nanotechnology
 
Disponibil în IBN: 7 octombrie 2019


Rezumat

Reflection and absorption spectra of SnS single crystals (Pnma (D2h 16) space group) were investigated at low and room temperatures. Features attributed to three excitonic states were found out. Parameters of excitons and bands were determined. The first excitonic states are formed at Γ-Y direction of Brillouin zone and have hole effective mass mV1* = 2.6m0 and electron effective mass mC1* = 1.3m0. The second excitonic states near X point in direction Γ-X and the third excitonic states in U point of Brillouin zone are formed. Excitonic transitions in U point are allowed in both polarizations and effective mass of holes in U point (mV1* = 3.46m0) is more than one at Γ-Y direction (mV1* = 2.6m0). Polarized transitions in reflection spectra of E||b and E⊥b polarizations in wide energy range of 1–6 eV were revealed. Optical functions (n, k, ε1 and ε2) for polarizations E||b and E⊥b in the wide energy range by Kramers-Kronig relations were calculated. 

Cuvinte-cheie
absorption, reflection and transmission spectraEffective masses of electrons and holesElectronic band structureExcitonic statesLayered SnS crystals