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Optical and Structure Properties of MgxZn1-xO Thin Films by Pulsed Laser Deposition
دراسة الخصائصالبصریة و التركیبیة لاغشیة MgxZn1-xO بالترسیب بالليزر

Authors: Gehan E. Simon --- Adawiya J. Haidar
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2009 Volume: 27 Issue: 14 Pages: 2653-2665
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study, the optical and structure properties of MgxZn1-xO thin films is reported. The MgxZn1-xO thin films were prepared on Glass substrates by Q-switch second harmonic Nd:YAG laser deposition technigue with wavelength of 532nm from a ZnO target mixed with Mg of (0-0.3) wt% , and the films deposited at temperature (250°C).The optical properties were characterized by transmittance and absorption spectroscopy measurements. For all the films the average transmission in the U.V (200-900) nm wavelength region was over 85% and the absorption edge shifted to a shorter wavelength as the magnesium concentration increased. The optical energy gap of MgxZn1-xO thin films, measured from transmittance spectra could be controlled between (3.3eV and 4.2eV) by adjusting magnesium concentration. X-ray diffraction was used to investigate the structure of the film. The refractive index of hexagonal MgxZn1-xO thin films decreases with the Mg concentration increase, such as at the wavelength of (500nm) the refractive index decreases from 1.93 to 1.85 as x increase from 0.15 to 0.3. The extinction coefficient and the complex dielectric constant were also investigate.


Article
PREPARATION AND STUDY CHARACTERISTICS OF CdO THIN FILM

Authors: Gehan E. Simon --- Ammar M. Al-Baldawi --- Adnan H. Fiaem --- Khalid J. Abd Al-Satter
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2009 Volume: 12 Issue: 4 Pages: 92-96
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Cadmium thin film have been prepared by vacuum evaporation method on a slide of glass substrate at room temperature and then oxidation process of thin film using oven in air, the crystal structure of the sample was studied using X-ray diffraction, the transmission and absorption characteristics were measured in the wavelength range (300-1000 nm) and the direct band gap energy was determined and found to be 2.45 eV ,the extinction coefficient was studied ,the electrical characteristics were measured, the electrical conductivity was 3×0-2 (Ω.cm), the carriers concentration was 8.9×014(cm-3).

تم تحضير غشاء من معدن الكادميوم بطريقة التبخير الحراري على شريحة من الزجاج الاعتيادي في درجة حرارة الغرفة ومن ثم أكسدة الغشاء بالفرن في الهواء تم دراسة التركيب البلوري للعينات بواسطة حيود الأشعة السينية إضافة الى دراسة النفاذية والامتصاصية للمادة ضمن المدى (300-1000 nm) ، تم حساب فجوة الطاقة المباشرة و وجد أنها (2.45eV) كذلك عامل الفقد مقابل طاقة الفوتون الساقط ,تم دراسة خواص الكهربائية و وجد أن التوصيلية الكهربائية (3 × 10-2Ω.cm) وتركيز الحاملات الشحنة (8.9 × 1014cm-3) .

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