Study the effects of laser annealing on nanostructure silicon thin films produced by PLD
مقدم أطروحة جامعية
مشرف أطروحة جامعية
الجامعة
الجامعة التكنولوجية
الكلية
-
القسم الأكاديمي
قسم العلوم التطبيقية
دولة الجامعة
العراق
الدرجة العلمية
ماجستير
تاريخ الدرجة العلمية
2011
الملخص الإنجليزي
-Silicon nanostructures of various morphologies have been produced by laser beam due to the localized heating established by the beam.
Two lasers were employed, the first was Nd:YAG pulsed laser to synthesize silicon films constituting silicon nanoparticles.
The second laser CW laser to produce silicon nanostructures by laser annealing .Various laser parameters were examined to study their effect on the film properties such as laser power density and annealing time.
We have studied the optical properties and film morphology of the annealed films.
Optical properties included the transmission, and photoluminescence.
While Scanning Electron Microscopy, Atomic Force Microscopy and Optical microscopy were used to monitor changes in the structure of silicon thin films which involves surface morphology and mean roughness of the prepared samples.
Our experimental data have been fitted with the theoretical quantum confinement model to analyze the photoluminescence curves and estimate the nanoparticle sizes and their distribution.
From the optical transmission studies, we found that the band gap of the nanostructured films lies between (2.4 – 2.5) eV due to the existence of various nanoparticle sizes in the deposited film.
Furthermore, the photoluminescence (PL) spectra indicate that the estimated band gap lies between (2.3 – 2.8) eV.
The corresponding nanoparticle sizes contributing to the PL emission are in the range (2.2 – 3.8) nm.
Finally, it was observed that the film morphology is significantly affected by the laser intensity and the annealing time.
Therefore, one could prepare various films suitable for different applications.
التخصصات الرئيسية
الموضوعات
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Abd, Ali Laiq. (2011). Study the effects of laser annealing on nanostructure silicon thin films produced by PLD. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305079
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Abd, Ali Laiq. Study the effects of laser annealing on nanostructure silicon thin films produced by PLD. (Master's theses Theses and Dissertations Master). University of Technology. (2011).
https://search.emarefa.net/detail/BIM-305079
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Abd, Ali Laiq. (2011). Study the effects of laser annealing on nanostructure silicon thin films produced by PLD. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305079
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-305079
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر