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Article
Preparation ultra fine particles from Ceramic refractorymaterial using CO2 Laser
تحضبر مساحيق فائقة النعومه من مواد سيراميكيه صناعيه باستعمال تقانة ليزر ثاني اوكسيد الكاربون

Authors: Talib Khalil Ibrahim طالب خليل ابراهيم --- Tarik Talib Issa, طارق طالب عيسى
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2009 Volume: 7 Issue: 8 Pages: 82-84
Publisher: Baghdad University جامعة بغداد

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Abstract

Samples of compact magnesia and alumina were evaporated using CO2-laser .The
Processed powders were characterized by electron microscopy and both scanning and transmission electron microscope. The results indicated that the particle size for both powders have reduced largely to 0.003 nm and 0.07 nm for MgO and Al2O3, with increasing in shape sphericity

حضرت مساحيق فائقة النعومه لمكبوسات المواد السيراميكيه ,اوكسيد المغنيسيوم واوكسيد الالمنيوم , حضرت باستعمال تقانة ليزر ثاني اوكسيد الكاربون . درست خصائصها التركيبيه بواسطة الحيود الالكتروني والمجهر الالكتروني الماسح والنافذ. النتائج بينت الاختزال بمقدار الحجم الحبيبي للمساحيق المحضره بحيث اصبحت بمقدار 0.003 نانو متر لمسحوق اوكسيد المغنيسيوم و لاوكسيد الالمنيوم0.07 , مع زياده في شكل الكرويه للحبيبات


Article
Preparation and characterization of nanostructure high efficient CdS/Si hetrojunction by CBD

Authors: Selma M.Hassan Al-Jawad --- Adawiya J. Haider --- Ali M. Mousa
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2009 Volume: 7 Issue: 8 Pages: 113-122
Publisher: Baghdad University جامعة بغداد

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Abstract

In this paper, CdS/Si hetrojunction solar cell has been made by Chemical Bath Deposition (CBD) of CdS thin film on to monocrystalline silicon substrate. XRD measurements approved that CdS film is changing the structure of CdS films from mixed hexagonal and cubic phase to the hexagonal phase with [101] predominant orientation. I-V characterization of the hetrojunction shows good rectification, with high spectral responsivity of 0.41 A/W, quantum efficiency 90%,and specific detectivity 2.9*1014 cmHz1/2W -1

هذا البحث تم تصنيع خلية شمسية متعددة الطبقات CdS/Si باستخدام الترسيب بالحمام الكيميائي لاغشية كبرتيد الكادميوم المرسبة على قواعد من السيلكون الاحادي البلورة.حيث اظهرت قياسات حيود الاشعة السينية ان التركيب البلوري لاغشية كبريتد الكادميوم متكون من تركيب خليط سداسي باتجاهية [101] .و قد اظهرت خصائص تيار-فولتية للمتعددة الطبقات تضخيم جيد مع استجابية طيفية عالية بحدود 0.41AW و ان الكفاءة الكمية 90% و الكشفية النوعية 2.9*1014 cmHz1/2W -1


Article
Post Thermal Oxidation of Tin Thin Film on Silicon Substrate for MIS Hetrojunction Prepared by Thermal Evaporation

Author: Halah H. Rashed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 4 Part (B) Scientific Pages: 499-511
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this work, preparation of high quality conductive oxide SnO2 thin film by post-thermal trearment of deposited tin by vacuum thermal evaporation on glass and p -type silicon substratesfor preparation of metal-insulator-semiconductor hetrojunction.The opticalabsorption, electrical, structural and surface morphology of the SnO2 thin film on glass substrate were characterized byUV-VIS-NIR spectrophotometer, electrical conductivity, X-ray diffraction spectrum andatomic force microscope respectively.The X-Ray Diffraction pattern show that the SnO2 thin film is polycrystalline with and tetragonal rutile, Atomic Force Microscope show that the grains size of the thin film varies from 50 to 150 nm .The optical properties show that SnO2 thin film is high absorbance in Ultra-violet region, whereas it's transparent in the visible and near infrared regions and have direct optical band gap of 3.6 eV, and last the electrical conductivity results show that the resistivity is decrease with increase the temperature and activation energy is approximately to the 0.107eV.The electrical properties of n SnO2/SiO2/p Sihetrojunctionwere studied by I–V measurement under dark and illumination conditions, in the dark condition, I–V measurement reveals that the heterojunction have rectifying behavior, the ideality factor and the reverse saturation current of this diode are 5.18 and 1.5×10–6 A respectively. Under illumination condition, I–V measurement reveals that the photocurrent is larger than the dark current, and a linear relation between ISC and VOC with the incident light intensity to reach a maximum value beyond tends to saturated and become constant. These electrical properties of prepared device can its work as a detector or solar cell.


Article
Synthesis and Characterization of Au:CuO Nanocomposite by Laser Soldering on Porous Silicon for Photodetector

Authors: Juhaina Moatasemballah --- Halah H. Rashed
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2017 Volume: 20 Issue: 2 Pages: 49-59
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

This work aimed to the synthesize of composite Au:CuO (NPs) by pulsed laser soldering process. The optical properties, stability, structural properties and surface morphology of Au:CuO nanocomposite were characterized by UV–VIS spectrophotometer, Zeta potential measurement, X-Ray Diffraction pattern and Atomic Force Microscope respectively. The band gap of Au doped CuO is about 1.95 eV. The amount of zeta potential is -54 mV, its indicating that the negatively charged of Au: CuO nanocomposite in deionized water and the colloid is good stability against aggregation. Surface morphology of Au:CuO nanocomposite show a large number of particles have diameter about 55nm. Au: CuO nanocomposite deposited on porous silicon by drop casting technique for preparation of silicon photodetector, the electrical properties prove that band gap alignment between Au: CuO nanocomposite and PS facilitates the electron transfer and further increases the photoresponsitivity and Quantum efficiency.

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