Optical parameter studies of thermally evaporated As-Se-Sn glassy system

Fouad, S.S.; El-Shazly, E. A. A.; Balboul, M.R.; Fayek, S.A.; El-Bana, M.S.

doi:10.1007/s10854-006-6760-4

Cited by 30 publications

(15 citation statements)

References 24 publications

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“…The average heat of atomization (H s ) and average single bond energy (H s /Z) are calculated using the relation given in Ref. [41,45,46] and are listed in Table 3. The values of H s have the similar behavior as the cohesive energy where both increase with increasing In content, whereas H s /Z decreases.…”

Section: Experimental Methodsmentioning

confidence: 99%

Analysis of chemical ordering and fragility for Ge–Se–In glasses

et al. 2015

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Decreasing the band gap of a material due to metal impurities has been approved through several studies, and this subject is considered as a major area of interest within the optoelectronic applications. Indium-based chalcogenides have been considered good candidates in nonlinear optics due to their ability to transmit in the infrared region. Hence, Ge 18 Se 82 has been alloyed with In. The nature of the chemical ordering of amorphous samples of Ge 18 Se 82-x In x (x = 0, 2, 4 and 6) have been systematically studied. The aim of present investigation is to understand the role of chemical composition and meancoordination number in determining their structural and physical properties. The compactness, d, of alloyed samples has been calculated from their measured densities, and values obtained have been interpreted using the topological model proposed to describe the atomic arrangements in these alloys. The variation of the glass transition temperature, T g , with the average coordination number, Z, has been investigated. The compositional dependence of the mean atomic volume, V m , has also been determined. The free volume percentage, FVP, in Ge 18 Se 82-x In x amorphous samples and their fragility indices, m, have been determined to examine the relationship with the mean-coordination number. We have also analyzed the obtained results on the basis of average single bond energy and electronegativity.

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Section: Experimental Methodsmentioning

confidence: 99%

Analysis of chemical ordering and fragility for Ge–Se–In glasses

et al. 2015

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“…The interaction decreases the role of lone-pair electrons in the glass formation. In order to calculate the number of lone- Table 3 Pre-exponential factors and activation energies for As 30 Se 70 and As 30 Se 67 Sn 3 Table 4 Values of Sn content, coordination number N c , number of constraints N con , number of valence electrons V, number of lone-pair electrons L, the density d, the atomic volume V a , and the optical energy gap E g Composition Sn (at.%) N c N con…”

Section: The Structural Role Of Lone-pair Electrons In Achieving the mentioning

confidence: 99%

“…As 30 pair electrons of a chalcogenide glass system; we must introduce the average coordination number proposed by Philips [21]. The average coordination number N c in a binary alloy A x B 1−x is defined by…”

Section: The Structural Role Of Lone-pair Electrons In Achieving the mentioning

confidence: 99%

“…The number of lone-pair electrons for As 30 Table 4. According to Liang criterion [25], the stable vitreous state can be obtained only if enough lone-pair electrons exist in the system, for a ternary system the number of lone-pair electrons must be larger than 1.0, and for a binary system the number of lone-pair electrons must be larger than 2.6 and less than 4.…”

Section: The Structural Role Of Lone-pair Electrons In Achieving the mentioning

confidence: 99%

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Short-range order analysis and electrical properties of As30Se70−xSnx glassy system

Balboul

Fouad

Fayek

et al. 2008

Journal of Alloys and Compounds

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“…5b, the k is observed to be very small in the visible region, which indicates that the AZO thin films are almost transparent in the visible region. At the wavelength k = 400 nm, for the AZO thin films deposited at 230, 300, 370 and 440°C, the k values are 3.981 9 10 -2 , 3.715 9 10 -2 , 1.299 9 10 -2 and 9.722 9 10 -3 , and the corresponding values of absorption coefficient (a) determined by the formula a = 4pk/k [43] are 1.251 9 10 4 , 1.167 9 10 4 , 4.081 9 10 3 and 3.054 9 10 3 cm -1 , respectively. The results in our present work are comparable to the results of previous studies.…”

Section: Structural and Morphological Propertiesmentioning

confidence: 99%

Optical, electrical and structural properties of aluminum-doped nano-zinc oxide thin films deposited by magnetron sputtering

Long

et al. 2014

J Mater Sci: Mater Electron

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Nano transparent conducting aluminum-doped zinc oxide (AZO) thin films were deposited on glass substrates by the magnetron sputtering technique. The thin films were characterized with X-ray diffractometer, scanning electronic microscopy, four-point probe and UVVisible spectrophotometer. The dependence of structural, morphological, optical and electrical properties on substrate temperature was investigated. The results show that all the thin films have hexagonal wurtzite structure with highly c-axis orientation. The structural and optoelectrical properties of thin films are observed to be subjected to the substrate temperature. The AZO thin film deposited at the substrate temperature of 370°C possesses the best optoelectronic properties, with the lowest resistivity of 6.12 9 10 -4 X cm, the minimum microstrain of 0.92 9 10 -3 , the highest average visible transmittance of 85.1 % and the maximum figure of merit of 1.03 9 10 4 X -1 cm -1 . The optical bandgap of thin films was estimated from Tauc's relation and observed to be an increasing tendency with the increment of the substrate temperature. Furthermore, the optical constants such as refractive index, extinction coefficient, dielectric constant, dissipation factor and optical conductivity were determined by the pointwise unconstrained optimization method, and the dispersion behaviour was studied by the Wemple-DiDomenico single-oscillator model.

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Optical parameter studies of thermally evaporated As-Se-Sn glassy system

Cited by 30 publications

References 24 publications

Analysis of chemical ordering and fragility for Ge–Se–In glasses

Analysis of chemical ordering and fragility for Ge–Se–In glasses

Short-range order analysis and electrical properties of As30Se70−xSnx glassy system

Optical, electrical and structural properties of aluminum-doped nano-zinc oxide thin films deposited by magnetron sputtering

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