Refractive index, static dielectric constant, energy band gap and oscillator parameters of Ga<sub>2</sub>SeS single crystals

Qasrawi, A.F.; Gasanly, Nizami

doi:10.1002/pssa.200723122

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…The optical band gaps form the plots of ( αE ) 2 versus photo energy E are shown in Figure 8 . The extrapolation of the linear part of ( αE ) 2 –E down to ( αE ) 2 = 0 gives the values of band gaps [ 25 ]. The measured band gap value of O 3 -based and H 2 O-based La 2 O 3 /Al 2 O 3 nanolaminates is 6.37 eV and 6.19 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

et al. 2022

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Due to the chemically inert surface of MoS2, uniform deposition of ultrathin high-κ dielectric using atomic layer deposition (ALD) is difficult. However, this is crucial for the fabrication of field-effect transistors (FETs). In this work, the atomic layer deposition growth of sub-5 nm La2O3/Al2O3 nanolaminates on MoS2 using different oxidants (H2O and O3) was investigated. To improve the deposition, the effects of ultraviolet ozone treatment on MoS2 surface are also evaluated. It is found that the physical properties and electrical characteristics of La2O3/Al2O3 nanolaminates change greatly for different oxidants and treatment processes. These changes are found to be associated with the residual of metal carbide caused by the insufficient interface reactions. Ultraviolet ozone pretreatment can substantially improve the initial growth of sub-5 nm H2O-based or O3-based La2O3/Al2O3 nanolaminates, resulting in a reduction of residual metal carbide. All results indicate that O3-based La2O3/Al2O3 nanolaminates on MoS2 with ultraviolet ozone treatment yielded good electrical performance with low leakage current and no leakage dot, revealing a straightforward approach for realizing sub-5 nm uniform La2O3/Al2O3 nanolaminates on MoS2.

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Section: Resultsmentioning

confidence: 99%

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

et al. 2022

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“…The static dielectric constant normalbold-italicεnormalbold-italics is computed from the static refractive index using 26 :…”

Section: Methodsmentioning

confidence: 99%

Effect of non-annealed and annealed ZnO on the optical properties of PVC/ZnO nanocomposite films

Al-Shawabkeh

Elimat

Abushgair

2021

Journal of Thermoplastic Composite Materials

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The goal of this study was to investigate the optical properties of the prepared polyvinyl chloride (PVC)/zinc oxide (ZnO) nanocomposite films. The PVC/ZnO nanocomposite films consist of the addition of different concentrations with both non-annealed ZnO nanoparticles and ZnO nanoparticles annealed at temperature of 700°C. The PVC/ZnO nanocomposite films by weight concentrations of (0 wt.%, 2.5 wt.%, 5 wt.% and 10 wt.%) have been prepared by the casting method. The optical absorbance and transmittance values of the composites films were measured in the wavelength range between (250 to 1100 nm) at room temperature by using the UV-1800 Shimadzu spectrophotometer. The optical properties (absorption coefficient, dielectric constant, refractive index, and optical conductivity) have been investigated by the ultraviolet (UV) spectrophotometer. The optical parameters (direct optical energy gap, excitation energy for electronic transitions, the dispersion energy, static refractive index, static dielectric constant, optical oscillator strengths, the moments of optical spectrum, linear optical susceptibility, third-order nonlinear optical susceptibility, nonlinear refractive index, high-frequency dielectric constant, the carrier concentration to the effective mass ratio, the long wavelength refractive index and the plasma frequency) were calculated. The results showed that the optical properties behavior of the PVC/ZnO nanocomposite films was found to be dependent on the ZnO concentration, and photon wavelength. In addition, the results of the study show that the optical parameters can be influenced by alter the concentration of the nonannealed and annealed a ZnO nanoparticle in the PVC polymer matrix.

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“…The best fit of all the experimental points were observed only for r = 1/2 and direct type transition is involved in these materials. 15,18 The indirect energy gap of the material has been determined by plotting (αhν) 1/2 with hν and it is shown in Fig. 3.…”

Section: Uv-vis-nir Studiesmentioning

confidence: 99%

OPTICAL AND MECHANICAL PROPERTIES OF MgCl₂ ADDED TRIGLYCINE SULPHATE SINGLE CRYSTALS

Krishnakumar

Rajaboopathi

Nagalakshmi

2012

Int. J. Mod. Phys. B

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This paper discusses the optical and mechanical properties of triglycine sulphate (TGS) and MgCl 2 added TGS single crystals (McTGS) grown from aqueous solution at room temperature using slow evaporation solution growth technique. The grown crystals were characterized by powder X-ray diffraction technique and the cell parameter values are found to be a = 9.405Å, b = 12.623Å and c = 5.721Å; β = 110.347 • with V = 637.001Å 3 . UV-Vis-NIR study shows the direct type transition is involved in these materials and indirect, phonon energy gap of McTGS crystals have also been calculated, and these values are less than the TGS crystals. Refractive index and real and imaginary part of the dielectric constant have been discussed for grown crystals. The value of interband optical transition and oscillator energy has been determined by analyzing refractive index with incident energy. Vickers microhardness test was used to determine hardness number, fracture toughness, brittleness index, yield strength and types of crack formed in the crystals.

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Refractive index, static dielectric constant, energy band gap and oscillator parameters of Ga₂SeS single crystals

Cited by 15 publications

References 17 publications

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

Effect of non-annealed and annealed ZnO on the optical properties of PVC/ZnO nanocomposite films

OPTICAL AND MECHANICAL PROPERTIES OF MgCl₂ ADDED TRIGLYCINE SULPHATE SINGLE CRYSTALS

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Refractive index, static dielectric constant, energy band gap and oscillator parameters of Ga2SeS single crystals

Cited by 15 publications

References 17 publications

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

Atomic Layer Deposition of Ultrathin La2O3/Al2O3 Nanolaminates on MoS2 with Ultraviolet Ozone Treatment

Effect of non-annealed and annealed ZnO on the optical properties of PVC/ZnO nanocomposite films

OPTICAL AND MECHANICAL PROPERTIES OF MgCl2 ADDED TRIGLYCINE SULPHATE SINGLE CRYSTALS

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Product

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Refractive index, static dielectric constant, energy band gap and oscillator parameters of Ga₂SeS single crystals

OPTICAL AND MECHANICAL PROPERTIES OF MgCl₂ ADDED TRIGLYCINE SULPHATE SINGLE CRYSTALS