A computational study of the electronic structure and optical properties of the complex TeO 2 /TeO 3 oxides as advanced materials for nonlinear optics

E Roginskii , M Smirnov , V. Kuznetsov (1) , O. Noguera (2) , J. Cornette (3) , Olivier Masson (2) , Philippe Thomas (2)

1 Boreskov Institute of Catalysis
2 IRCER-AXE3 - IRCER - Axe 3 : organisation structurale multiéchelle des matériaux
3 IRCER - Institut de Recherche sur les CERamiques

Electronic structure of series of tellurium oxide crystals within the TeO 2-TeO 3 binary system is studied with generalized gradient approximation to DFT, hybrid DFT-HF method with the PBE0 and B3LYP exchange-correlation functionals and with quasiparticle G 0 W 0 approach. Comparison with available experimental data revealed significant underestimation of the band gap values within DFT. The hybrid DFT-HF method leads to slightly overestimated values of the bandgap, and the best agreement with experimental data provides the "one-shot" G 0 W 0 calculations starting from Kohn-Sham solutions. The electronic structure of tellurium oxides is discussed in details. It is found that bandgap value decreases proportionally to fraction of tellurium atoms in octahedral coordination. This change is due to formation of gap states by 5s(Te) electrons which do not participate in Te(VI)-O bonding. Dielectric properties is calculated within Random Phase approximation for the series of tellurium oxides and high nonlinear properties of the compounds is predicted by empirical Miller's rule.

Mots clés: Ab initio; DFT; GW; tellurium oxides; nonlinear optics; electronic structure

Domaines: Chimie; Matériaux; Sciences de l'ingénieur [physics]; Matériaux

E Roginskii, M Smirnov, V. Kuznetsov, O. Noguera, J. Cornette, et al.. A computational study of the electronic structure and optical properties of the complex TeO 2 /TeO 3 oxides as advanced materials for nonlinear optics. Materials Research Express, 2019, 6 (12), pp.125903. ⟨10.1088/2053-1591/ab55a3⟩. ⟨hal-02435117⟩