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Article
Growth of Nanostructured CdO:In Films by Pulsed Laser Deposition

Authors: Ali A. Yousif --- Mazin H. Hasan
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2015 Volume: 11 Issue: 1 Pages: 15-19
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, indium-doped cadmium oxide (CdO:In) films were prepared by Pulsed Laser Deposition (PLD) on sapphire α- Al2O3 (006) substrate with thickness of about 100nm for all CdO:In films at different deposition conditions and the number of laser pulses was 100 pulses, by Nd-YAG Q-Switching second harmonic generation (SHG) pulsed laser with a wavelength of 532nm, repetition rate 10Hz and pulsed width 10ns. The effect of doping on the structure and morphology properties of the CdO:In films have been investigated by X-Ray diffraction (XRD), and Atomic Force Microscopy (AFM). The result showed that nano-crystalline and (111)-oriented CdO films were obtained at substrate temperature of 400°C, laser fluence 400mJ. The smallest grain size was obtained at 7wt.% In are 16.52nm, this indicates the superior nanocrystallinity of the films which also has observed from the SEM and AFM images. The surface morphology of the films reveals that presence of indium content in the structure did affect the surface morphology of the films significantly.


Article
Electrical glow discharges and plasma parameter of planar sputtering system for silver target
دراسة معلمات التفريغ الكهربائي لمنظومة الترذيذ المستمر لهدف مسطح من الفضة

Author: Mazin H. Hasan مازن حامد حسن
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2018 Volume: 16 Issue: 37 Pages: 65-72
Publisher: Baghdad University جامعة بغداد

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Abstract

DC planar sputtering system is characterized by varying discharge potential of (250-2000 volt) and Argon gas pressures of (3.5×10-2 – 1.5) mbar. The breakdown voltage for silver electrode was studied with a uniform electric field at different discharge distances, as well as plasma parameters. The breakdown voltage is a product of the Argon gas pressure inside the chamber and gab distance between the electrodes, represent as Paschen curve. The Current-voltage characteristics curves indicate that the electrical discharge plasma is working in the abnormal glow region. Plasma parameters were found from the current-voltage characteristics of a single probe positioned at the inter-cathode space. Typical values of the electron temperature and the electron density are in the range of (2.93 –5.3) eV and (10-16 -10-17) m-3 respectively.

لقد تم في هذا البحث دراسة الخصائص الكهربائية ومعلمات البلازما لمنظومة الترذيذ المستمر مصنعة محليا, من خلال تغير فرق الجهد الكهربائي (250-2000) فولت وتغير ضغط غاز حجرة التفريغ (3.5×10-2– (1.5ملي بار. فولتية الانهيار, ضغط غاز الاركون, المسافة بين اقطاب الفضة هي المتغيرات الخارجية المستخدمة. لقد تم دراسة خصاص التفريغ الكهربائي من خلال توصيف منحني تيار التفريغ الكهربائي – الفولتية المجهزة, منحني باشنت, و منحني تيار التفريغ- ضغط الغاز السلط. كذلك تم دراسة خصائص البلازما المنتجة بأستخدام مجس لاتكميور في المنطقة الداخلية لعامود البلازما. حيث تبين ان قيم درجة حرارة الالكترونات (2.93 –5.3) الكترون فولت وكثافة الالكترونات (10-16-10-17).

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