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Article
Influence of Doping on Optical Properties of (CdS:Fe+3)Thin Films Prepared by Chemical Spray pyrolysis

Author: Karrar Mahdi Saleh
Journal: Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية ISSN: 1814635X Year: 2019 Volume: 30 Issue: 1 Pages: 193-198
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Undoped CdS and doped with iron CdS:Fe+3 thin films have been prepared by chemical spray pyrolysis method on The glass different temperatures substrate of cadmium nitrate solution with constant thickness (450 ± 5 nm), and study the effect of the percentage of doping with iron on optical properties of prepared films.The optical properties have been studied from transmittance and absorbance spectral within wavelengths range (380-900 nm). The results showed that all the prepared films have direct electronic transitions and optical energy gap between (2.31-2.44 ) eV. They also showed that the transmittance and optical energy gap of films prepared from nitrate solution increase with increasing of substrate temperature, then transmittance start downward with The continued increase in temperature (673, 723) k, and a decrease in the optical energy gap with increasing doping percentage with iron..

تم في هذا البحث تحضير اغشية رقيقة من كبريتيد الكادميوم غير المشوبة ( CdS) والمشوبة بالحديد (CdS:Fe+3) بطريقة التحلل الكيميائي الحراري (CSP) على قواعد زجاجية وبدرجات حرارة مختلفة من محلول نترات الكادميوم بسمك ثابت (430±5 nm) ودراسة تأثير نسب التشويب بالحديد على الخصائص البصرية للأغشية المحضرة. تم دراسة الخصائص البصرية من خلال دراسة طيفي النفاذية والامتصاصية ضمن الاطوال الموجية (380-900 nm). بينت النتائج ان جميع الاغشية المحضرة تمتلك انتقالات الكترونية مباشرة وبفجوة طاقة بصرية تتراوح بين (2.31-2.44 eV). كما اظهرت نتائج القياسات البصرية للأغشية المحضرة من محلول النترات زيادة في قيمة النفاذية وفجوة الطاقة البصرية مع زيادة درجة حرارة القاعدة , ثم تبدأ النفاذية بالنقصان مع استمرار زيادة درجة الحرارة (673, 723) k, ونقصان في فجوة الطاقة البصرية نتيجة التشويب بالحديد.

Keywords

CdS :Fe+3 --- CSP --- Optical properties --- doping --- iron.


Article
Influence of Substrate Temperature on Structural Properties of CdS Thin Films Prepared by Chemical Spray pyrolysis

Author: M.Sc. Karrar. Mahdi. Saleh
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2018 Volume: 24 Issue: 100 / علمي Pages: 95-109
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In the present work, CdS thin films have been prepared by chemical spray paralysis method on glass substrate with different temperature from cadmium nitrate with constant thickness (440 ± 10 nm), to study the effect of the substrate temperature on structure properties of prepared films.The results of structural measurements showed through a Scanning Electron Microscope (SEM) for the homogeneity of the prepared films, and from the results of an Atomic Force Microscope (AFM) the nanoparticles are the composition and the square root value of the average roughness (RMS ) of the thin films is equal ( 0.699nm ). And from X-ray diffraction pattern the results showed that all the films are polycrystalline, hexagonal structure, grain size within the range of nano scale, and substrate temperature does not affect on the crystal structure of the films, and prepared film has a preferred orientation along (002) (i.e., the axis C perpendicular to the substrate).

Keywords

CdS --- CSP --- Synthetic properties.

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