TY - JOUR ID - TI - Study the effect oxidation time on physical properties of cdo thin films prepared by thermal evaporated AU - Lecturer Fatima I. Sultan PY - 2015 VL - 20 IS - 86 / علمي SP - 997 EP - 1002 JO - journal of the college of basic education مجلة كلية التربية الاساسية SN - 18157467 27068536 AB -

University of Technology.Abstract thin films were prepared by thermal evaporated method of cadmium metal on a glass substrate, then conventional oxides in air at 500ᵒC and different oxidation times (30, 60 and 90) mint. The characterization of samples were carried out by atomic force microscopy and UV-VIS spectroscopy. Detailed optical and morphological properties of the prepared films are presented at different oxidation times. A UV-VIS transmition spectrum of produced films shows high transmission in visible, IR region and low transmission in UV region. Average grain size in the range of nanometer and decreases with increasing oxidation time. Keywords:, Cadmium thin films, thin films, thermal evaporation .1. Introduction Cadmium oxide (CdO) has high electrical conductivity and high optical transmittance with a moderate refractive index in the visible region of the solar spectrum. In recent years it has found various applications in transparent electrodes, solar cells, photo transistors, photodiodes, gas sensors, etc. [1,2]. CdO films are wide, direct band-gap semiconductors with an optical energy gap of about 2.4 eV at room temperature [3]. CdO, with it's cubic structure, is also a II-VI n-type semiconductor with donor defects, such as Cd interstitials and oxygen vacancies [4, 5]. CdO thin films are prepared by many physical and chemical techniques. Many physical and chemical preparation techniques such as pulsed laser deposition [6], sputtering [7], chemical vapor deposition [8], reactive evaporation [9], spray pyrolysis [10], sol-gel [11-13], etc. have been used in order to obtain CdO films .In this study, highly transparent and conductive CdO films were prepared by using thermal evaporation technique. The variations in the morphological and the optical properties of the CdO films with oxidation time are presented.2. Experiments details Cadmium material was grown from (Balzers BAE 080) evaporation system under vacuum of 2×10-4 torr on glass substrates at room temperature using a molybdenum boat heater. The deposited films oxides ER -