Excitonic spectra and energy band structure of ZnAl2Se4 crystals

Syrbu Nicolae; Zalamai Victor; Tiron Andrew; Tiginyanu Ion

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SYRBU, Nicolae, ZALAMAI, Victor, TIRON, Andrew, TIGINYANU, Ion. Excitonic spectra and energy band structure of ZnAl2Se4 crystals. In: Optical Materials, 2015, vol. 49, pp. 319-324. ISSN 0925-3467. DOI: https://doi.org/10.1016/j.optmat.2015.09.035

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Optical Materials

Volumul 49 / 2015 / ISSN 0925-3467

Excitonic spectra and energy band structure of ZnAl₂Se₄ crystals

DOI:https://doi.org/10.1016/j.optmat.2015.09.035

Pag. 319-324

Syrbu Nicolae¹, Zalamai Victor², Tiron Andrew¹, Tiginyanu Ion³

¹ Technical University of Moldova,
² Institute of Applied Physics, Academy of Sciences of Moldova,
³ Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova

Disponibil în IBN: 21 decembrie 2017

Rezumat

Absorption, reflection and wavelength modulated reflection spectra were investigated in ZnAl₂Se₄ crystals. The energy positions of ground and excited states for three excitonic series (A, B and C) were determined. The main parameters of excitons and more precise values of energy intervals V₁(Γ₇)-C₁(Γ₆), V₂(Γ₆)-C₁(Γ₆), and V₃(Γ₇)-C₁(Γ₆) were estimated. Values of splitting due to crystal field and spin-orbital interaction were calculated. Effective masses of electrons (m_C1∗) and holes (m_V1∗, m_V2∗, m_V3∗) were estimated. Reflection spectra contours in excitonic region were calculated using dispersion equations. Optical functions for E > E_g from measured reflection spectra were assigned on the base of Kramers-Kronig relations.

Cuvinte-cheie
Band structure, Excitons, Kramers-Kronig analysis, Reflection and transmission spectra, Chalcogenide semiconductors compounds

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