Valence band structure and optical properties of ZnO1-xSx ternary alloys
نویسندگان
چکیده
The k.p method and the effective mass theory are applied to compute valence-band electronic structure and optical properties of ZnO1-хSх ternary alloys under biaxial strain. A significant modification of the band structure with increasing sulfur content is revealed. Features of wavefunctions and matrix elements in the transverse electrical (TE) and transverse magnetic (TM) regimes for three valence subbands are studied and discussed. The results of calculations of interband transition energy and spontaneous emission spectra are in agreement with experimental data for ZnO1-хSх films grown by radiofrequency magnetron sputtering technique.
منابع مشابه
Band-gap engineering of ZnO1-xSx films grown by rf magnetron sputtering of ZnS target
Structural and optical properties of ZnO1-хSх (0 ≤ x ≤ 1.0) thin films grown onto sapphire substrates (с-Al2O3) at 300 C by radio frequency (rf) magnetron sputtering of ZnS ceramic target are studied. A possibility of purposeful controlling sulfur content and, as consequence, ZnO1-хSх band gap energy via changing the ratio of the partial pressures of argon and oxygen are revealed. Linear depen...
متن کاملMulticolor emission from intermediate band semiconductor ZnO1−xSex
Photoluminescence and photomodulated reflectivity measurements of ZnOSe alloys are used to demonstrate a splitting of the valence band due to the band anticrossing interaction between localized Se states and the extended valence band states of the host ZnO matrix. A strong multiband emission associated with optical transitions from the conduction band to lower E- and upper E+ valence subbands h...
متن کاملFirst Principles Study on Electronic Structure and Optical Properties of Ternary GaAs:Bi Alloy
The electronic structure and optical properties of ternary GaAs:Bi alloy are investigated by first principles calculations. It is found that the band gap of GaAs1-xBix decreases monotonously with the increasing of Bi concentration, resulting in the fundamental absorption edge and main absorption peaks of GaAs1-xBix shifting toward lower energy with the increase of the Bi content. The optical co...
متن کاملTernary SnS2–xSex Alloys Nanosheets and Nanosheet Assemblies with Tunable Chemical Compositions and Band Gaps for Photodetector Applications
Ternary metal dichalcogenides alloys exhibit compositionally tunable optical properties and electronic structure, and therefore, band gap engineering by controllable doping would provide a powerful approach to promote their physical and chemical properties. Herein we obtained ternary SnS(2-x)Se(x) alloys with tunable chemical compositions and optical properties via a simple one-step solvotherma...
متن کاملFirst-Principles Study of Structure, Electronic and Optical Properties of HgSe in Zinc Blende (B3) Phase
In this paper, the structural parameters, energy bands structure, density ofstates and charge density of HgSe in the Zincblende(B3) phase have been investigated.The calculations have been performed using the Pseudopotential method in theframework of density functional theory (DFT) by Quantum Espresso package. Theresults for the electronic density of states (DOS) show tha...
متن کامل