Optical characterization of polycrystalline ZnSe1−xTex thin films using variable angle spectroscopic ellipsometry and spectrophotmetery techniques

Shaaban, E.R.; El-Hagary, M.; Emam-Ismail, M.; Elnaeim, A.M. Abd; Moustafa, S.H.; Adel, A.

doi:10.1016/j.mssp.2015.06.048

Cited by 28 publications

(7 citation statements)

References 29 publications

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“…The increase of Te concentration in a supercell can increase the concentration of Zn–Te bonds in the solid solutions. It was reported that the Zn–Te bond energy is lower than that of the Zn–Se bond . Thus, the reduction in the bandgap of ZnSe 1– x Te x solid solutions with increasing Te concentration is due to the lower bond energy of Zn–Te bond.…”

Section: Resultsmentioning

confidence: 97%

“…It was reported that the Zn−Te bond energy is lower than that of the Zn−Se bond. 26 Thus, the reduction in the bandgap of ZnSe 1−x Te x solid solutions with increasing Te concentration is due to the lower bond energy of Zn−Te bond.…”

Section: Calculation Methodologymentioning

confidence: 99%

“…The bandgap of ZnSe can be easily tuned from 2.25 to 2.70 eV by making solid solutions from ZnSe and ZnTe. − Shaaban et al determined that the bandgap value of ZnSe 1– x Te x solid solutions is reduced from 2.59 to 2.16 eV with the increase of Te content. Accordingly, the ZnSe 1– x Te x thin films were used as the photovoltaic active materials for light harvesting, which were experimentally prepared by using various techniques like molecular beam epitaxy, electron beam evaporation, high vacuum evaporation, spray pyrolysis, and metal organic chemical vapor deposition .…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Hussain

Guo

2021

J. Phys. Chem. C

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In this work, hybrid density functional theory has been used to investigate the structural and optoelectronic properties of wurtzite ZnSe1–x Te x solid solutions. The calculated bandgap values are 2.82, 2.60, 2.48, 2.38, and 2.15 eV for the ZnSe, ZnSe0.75Te0.25, ZnSe0.50Te0.50, ZnSe0.25Te0.75, and ZnTe, respectively, which are in agreement with the experimental results. The valence band maximum of ZnSe1–x Te x solid solutions is mainly comprised of Se-4p, Te-5p, Zn-3p, and Zn-3d states. Moreover, a red shift (toward longer wavelength) is observed in the absorption edges of the ZnSe1–x Te x solid solutions, which enables them to effectively utilize visible light for the photocatalytic applications. The Te doping into ZnSe can increase the n-type conductivity of the obtained solid solutions. Effective mass of photogenerated charge carriers at all Te concentrations is less than 1.5m 0, implying the high mobility of charge carriers in the ZnSe1–x Te x solid solutions. The charge separation can be improved at the 25% and 50% doping of Te. Moreover, the positions of valence and conduction band edges of ZnSe1–x Te x ternary alloys straddle the potentials of both CO2 reduction and water oxidation, implying that these solid solutions are promising for the photocatalytic reduction of CO2 and oxidation of water. In addition, the water and CO2 molecules are strongly adsorbed on the surface of solid solutions.

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Section: Resultsmentioning

confidence: 97%

Section: Calculation Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Hussain

Guo

2021

J. Phys. Chem. C

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“…where α is the absorption coefficient, h is Planck's constant, ν is the frequency of electromagnetic radiation, E g is the the energy gap width and A is a constant depending on the probabilities of electron transitions. For the coefficient ρ different values are provided [ 41 ], such as 1/2 and 3/2 in the case of accessible and inaccessible direct interband transitions and 2 and 3 for successively permissible and prohibited intermediate transitions. However, the best results were obtained using an exponent equal to 1/2 [ 42 ] and this was also done herein.…”

Section: Resultsmentioning

confidence: 99%

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Tański

Matysiak

Hajduk

2016

Beilstein J. Nanotechnol.

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SummaryThe aim of this study was to produce nanocomposite polymer fibres, consisting of a matrix of polyacrylonitrile (PAN) and a reinforcing phase in the form of SiO2/TiO2/Bi2O3 nanoparticles, by electrospinning the solution. The effect of the nanoparticles and the electrospinning process parameters on the morphology and physical properties of the obtained composite nanofibres was then examined. The morphology of the fibres and the dispersion of nanoparticles in their volume were examined using scanning electron microscopy (SEM). All of the physical properties, which included the band gap width, dielectric constant and refractive index, were tested and plotted against the concentration by weight of the used reinforcing phase, which was as follows: 0%, 4%, 8% and 12% for each type of nanoparticles. The width of the band gap was determined on the basis of the absorption spectra of radiation (UV–vis) and ellipsometry methods. Spectroscopic ellipsometry has been used in order to determine the dielectric constant, refractive index and the thickness of the obtained fibrous mats.

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“…Precisely investigation of the structure and optical properties of electron beam evaporated TM‐doped DMSs nanocrystalline thin films is significant for the design of the magneto‐optical devices and magnetic sensors. Recently, our attempts have been achieved to prepare and investigate the structure, optical, and magnetic properties of TM‐doped II‐VI nanomaterial in the form of thin film via electron beam evaporation technique …”

Section: Introductionmentioning

confidence: 99%

Influences of Mn doping on the microstructural, semiconducting, and optoelectronic properties of HgO nanostructure films

et al. 2019

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Mn-doped HgO nanostructured thin films (Hg 1-x Mn x O) have been prepared using electron beam evaporation technique on Corning glass (1022) substrate at room temperature with different concentrations x = 0, 0.015, 0.05, 0.1, 0.15, and 0.2.The microstructural, morphological, semiconducting, and optoelectronic properties of the films have been investigated. The X-ray diffraction spectra suggest a hexagonal wurtzite type structure with lattice parameters decreased with increasing Mn content. It was found that the average particle size of the films decreases with increasing Mn doping which is confirmed by FE-SEM and AFM micrographs. The optical band gap of the investigated Mn-doped HgO nanocrystalline films is determined from the absorption coefficient and found to increase with the increase of Mn concentration which is attributed to the sp-d exchange interaction and/or the quantum confinement effect. The refractive index and extinction coefficient of the Mn-doped HgO films are also reported. The refractive index dispersion n(λ) is analyzed by single-effective-oscillator dispersion model proposed by the Wemple-DiDomenico (WDD). The oscillator parameters were estimated. The obtained dispersion values are suitable for the design of optoelectronic devices. K E Y W O R D S diluted magnetic semiconductors, microstructure properties, nanomaterial, optical properties, single oscillator parameters

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Optical characterization of polycrystalline ZnSe1−xTex thin films using variable angle spectroscopic ellipsometry and spectrophotmetery techniques

Cited by 28 publications

References 29 publications

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Influences of Mn doping on the microstructural, semiconducting, and optoelectronic properties of HgO nanostructure films

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Optical characterization of polycrystalline ZnSe1−xTex thin films using variable angle spectroscopic ellipsometry and spectrophotmetery techniques

Cited by 28 publications

References 29 publications

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe1–xTex for the Photocatalytic Applications

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe1–xTex for the Photocatalytic Applications

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO2, TiO2and Bi2O3nanoparticles

Influences of Mn doping on the microstructural, semiconducting, and optoelectronic properties of HgO nanostructure films

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Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe_1–xTe_x for the Photocatalytic Applications

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles