Kayed, Tarek Said

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https://hdl.handle.net/20.500.14411/8435
Name Variants
Kayed, Tarek S.
T.,Kayed
K., Tarek Said
T.S.Kayed
Kayed, Tarek Said
T., Kayed
Tarek Said, Kayed
K.,Tarek Said
Kayed,T.S.
Kayed, TS
Kayed, T. S.
Kayed, TS
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Doçent Doktor
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Main Affiliation
Department of Electrical & Electronics Engineering
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Former Staff
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Scholarly Output

24

Articles

21

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5/0

Supervised MSc Theses

0

Supervised PhD Theses

0

WoS Citation Count

205

Scopus Citation Count

214

WoS h-index

8

Scopus h-index

9

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0

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0

WoS Citations per Publication

8.54

Scopus Citations per Publication

8.92

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0

Supervised Theses

0

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JournalCount
Crystal Research and Technology4
Materials Research Bulletin2
Journal of Alloys and Compounds2
Journal of Electronic Materials2
physica status solidi (b)2
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2003 - 20103
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Subject: X-ray diffraction

Scholarly Output Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Article
    Citation - WoS: 7
    Citation - Scopus: 7
    Photoconductivity Kinetics in Agin5s8< Thin Films
    (Elsevier Science Sa, 2010) Qasrawi, A. F.; Kayed, T. S.; Ercan, Ismail
    The temperature (T) and illumination intensity (F) effects on the photoconductivity of as grown and heat-treated AgIn5S8 thin films has been investigated. At fixed illumination intensity, in the temperature region of 40-300K, the photocurrent (I-ph) of the films was observed to decrease with decreasing temperature. The I-ph of the as grown sample behaved abnormally in the temperature region of 170-180K. At fixed temperature and variable illumination intensity, the photocurrent of the as grown sample exhibited linear, sublinear and supralinear recombination mechanisms at 300 K and in the regions of 160-260K and 25-130 K. respectively. This behavior is attributed to the exchange of role between the linear recombination at the surface near room temperature and trapping centers in the film which become dominant as temperature decreases. Annealing the sample at 350 K for 1 h improved the characteristic curves of I-ph. The abnormality disappeared and the I-ph - T dependence is systematic. The data analysis of which revealed two recombination centers located at 66 and 16 meV. In addition, the sublinear recombination mechanism disappeared and the heat-treated films exhibited supralinear recombination in most of the studied temperature range. (C) 2010 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    Article
    Citation - WoS: 42
    Citation - Scopus: 41
    Synthesis and Characterization of Mg2b2<
    (Pergamon-elsevier Science Ltd, 2005) Qasrawi, AF; Kayed, TS; Mergen, A; Gürü, M
    Magnesium borate of the form Mg2B2O5 has been prepared and its structural and thermal properties were studied using X-ray diffraction and differential thermal analysis. An investigation of the electrical and optical properties of Mg2B2O5 system has been carried out. The electrical resistivity of the sample was measured in the temperature range of 170-400 K. The data analysis revealed an extrinsic nature of the conductivity with two impurity levels located at 0.13 and 0.71 eV in the temperature ranges of 170-230 K and 240-400 K, respectively. The optical transmission and reflection was recorded at 300 K in the incident photon energy range of 3.0-6.0 eV. The absorption coefficient data analysis revealed an indirect optical energy band gap of 4.73 eV. In addition, two impurity levels located at 3.43, and 4.49 eV were observed in the absorption spectra. (c) 2005 Elsevier Ltd. All rights reserved.
  • Thumbnail Image
    Article
    Citation - WoS: 7
    Citation - Scopus: 9
    Properties of Boron Doped Ti-Ba Superconductors
    (Pergamon-elsevier Science Ltd, 2003) Kayed, TS
    The effects of boron doping on the formation and properties of the Tl-based superconductors have been studied. Up to 10 wt.% boron has been added to the oxides having the nominal composition, Tl1.8Ba2Ca2.2Cu3Ox, by the usual solid-state reaction method. Boron additions in the range 0.8-1.0% increase the fraction of the Tl-2223 phase and significantly improve the critical temperature of the samples. Higher amounts of boron additions eliminate the Tl-2223 phase, reduce the fraction of Tl-2212 phase and cause separate non-superconducting phases to be formed. The formation of non-superconducting phases does not allow us to obtain pure Tl-2212 phase. (C) 2002 Elsevier Science Ltd. All rights reserved.