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Iraqi Journal of Applied Physics

المجلة العراقية للفيزياء التطبيقية

ISSN: 18132065 23091673
Publisher: iraqi society for alternative and renewable energy sources and techniques
Faculty:
Language: English

This journal is Open Access

About

The Iraqi Journal of Applied Physics (IJAP) is a peer reviewed journal of high quality devoted to the publication of original research papers from applied physics and their broad range of applications. IJAP publishes quality original research papers, comprehensive review articles, survey articles, book reviews, dissertation abstracts in physics and its applications in the broadest sense. It is intended that the journal may act as an interdisciplinary forum for Physics and its applications. Innovative applications and material that brings together diverse areas of Physics are particularly welcome. Review articles in selected areas are published from time to time. It aims to disseminate knowledge; provide a learned reference in the field; and establish channels of communication between academic and research experts, policy makers and executives in industry, commerce and investment institutions. IJAP is a quarterly specialized periodical dedicated to publishing original papers, letters and reviews in: Applied & Nonlinear Optics, Applied Mechanics & Thermodynamics, Digital & Optical Communications, Electronic Materials & Devices, Laser Physics & Applications, Plasma Physics & Applications, Quantum Physics & Spectroscopy, Semiconductors & Optoelectronics, Solid State Physics & Applications, Alternative and Renewable Energy, Computers Networks and Applications.

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Contact info

P. O. Box 55259,
Baghdad 12001,
Iraq
Website: www.iraqiphysicsjournal.com
Email: admin@iraqiphysicsjournal.com
Email: editor_ijap@yahoo.co.uk

Table of content: 2010 volume:6 issue:3

Article
Technology and Future of III-V Multi-Junction Solar Cells

Authors: S. Lansel
Pages: 3-8
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Abstract

Multi-junction solar cells created from III-V semiconductor materials exhibit high efficiencies matched by no other existing photovoltaic technology. Multi-junction solar cells are composed of 3 layers of material that have different bandgaps. The top layer has the largest bandgap while the bottom layer has the smallest bandgap. This design allows less energetic photons to pass through the upper layer(s) and be absorbed by a lower layer, which increases the overall efficiency of the solar cell. One important design consideration is that the photocurrent generated in each layer must be the same since the layers are in series. In addition, the bandgaps of each layer should differ by approximately equal energies so that the spectrum of incident radiation is most effectively absorbed. Although multi-junction solar cells are very efficient, they are also very expensive.


Article
DC Conductivity and Optical Properties of InSbTe3 Amorphous Thin Films

Authors: A.E. Bekheet --- A.H. Ashor --- H.E. Atyia --- M.A. Afifi
Pages: 9-13
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Abstract

Measurements of dc electrical conductivity and optical properties have been made on InSbTe3 thin films prepared by thermal evaporation having different thickness (25-150) nm range. The structure of InSbTe3 in its powder and thin film forms were investigated by X-ray diffraction (XRD). The electrical conductivity was measured in the temperature (303-392) K range. The obtained values of dc electrical conduction activation energy 2E4 were found to be nearly independent on the film thickness and have the mean value of 0.173 eV in the range considered. The refractive index n and the absorption index k were determined in the spectral range 400-2500 nm. It is observed that n decreases with increasing film thickness at any wave length, while k is practically independent on film thickness in the range 25-150 nm. For films with thicknesses in the range 170-304 nm, the spectral distribution of transmittance T and reflectance R showed that T+R<1 in the whole spectrum which due to light scattering by surface roughness whose existence is confirmed by electron microscopy. Analysis of k indicated that the absorption mechanism refers to the existence of indirect transitions with an optical energy gap of 0.52 eV.


Article
Field Dependent Critical Trap Density for Thin Gate Oxide Breakdown

Authors: L.Y. Zhao --- Y.M. Ming --- L.W. Lang --- Q. Yao
Pages: 15-19
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Abstract

We have found that the total trapped negative charge in a thin gate-oxide at the point of breakdown is a strong function of the stress field. This observation is in direct contrast with previous reports in the literature. The field dependent behavior of total trapped charge leads to the conclusion that the critical trap density for breakdown is also field dependent. We use the field dependent hopping conduction to explain why the critical trap density for breakdown in the percolation model should be field dependent.


Article
Modeling of Temperature-Dependent Absorptivity of Laser-Treated Surface

Authors: R.K. Kadhum --- T.S. Salman --- S.A. Mahmood
Pages: 21-24
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Abstract

In this work, we have considered the effect of the various properties on the thermal field, the absorptivity plays a special role, because it controls directly the heat input to the sample, while being itself a function of surface temperature. In order to take this dependence into account, the one-dimensional heat conduction equation was solved for a semi-infinite geometry using variable absorptivity and assuming constant thermal conductivity and thermal diffusivity. It is shown that the surface temperature satisfies an Abel integral equation with an approximate analytical solution that gives a temperature rise at the surface linear with t. Comparison is made between analytical approximate expressions, numerical solutions, previous models and experimental results.


Article
Investigations of Linear and Nonlinear Optical Properties of Transparent ZnO Thin Films Grown by Sol-Gel Method

Authors: R.O. Al-Khayat --- O.M. Al-Taweel --- M.R. Al-Hadidi
Pages: 29-31
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Abstract

The optical properties of ZnO thin films grown by sol-gel method were studied using second and third harmonic generation and photoluminescence measurements, respectively. The structural properties of the ZnO thin films were carried out using x-ray method. The effects of the thickness variation and annealing temperature on the crystallinity parameters were observed.


Article
Optical Properties of Many-Layers Zinc Sulphide Thin Films prepared by Chemical Bath Deposition Method

Authors: S.M. Khalaf --- W.A. Hameed --- M.A.L. Al-Safi
Pages: 33-35
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Abstract

Thin films of zinc sulphide have been prepared by chemical bath deposition in alkaline ammonia solutions from zinc acetate and thiourea, using successive depositions. The obtained films are amorphous. Air annealing did not improve the optical properties of the films with a too large number of layers.

Keywords

Zinc sulphide --- Thin films --- CBD --- Annealing

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