Do you want to publish a course? Click here

Study the possibility of using thin films of ZnO as an effective medium for random laser

دراسة إمكانية استخدام أغشية رقيقة من الـ ZnO كوسط فعال لليزر عشوائي

529   0   0   0.0 ( 0 )
 Publication date 2020
  fields Physics
and research's language is العربية
 Created by Saeed Maroof




Ask ChatGPT about the research

Thin films of ZnO were successfully prepared on glass substrates with different thicknesses by sol-gel method by using zinc acetate dehydrate as precursor. The surface of thin films morphology from were studied by AFM micrographs, the structural properties of the obtained ZnO thin film are studied using X-ray diffraction spectra and their elemental analysis by X-ray energy dispersion spectroscopy (EDX). Moreover, optical properties and emission of ZnO nano thin film were evaluate during ultraviolet-visible-infrared and photoluminescence spectra. The AFM investigations have revealed that the morphology of the films is smooth and homogeneous specially for the high thickness and the grains produced on the surface take the form of nano rods with an average diameter of 240nm. Structural analysis by X-ray diffraction showed that the deposited films have a preferred orientation along the direction (112) and are relatively uniform with average crystal size 19nm, while the EDX spectrum showed that the elemental composition of these films is zinc oxide. The spectrophotometer Ultraviolet -Visible confirms that it is possible to get good transparent ZnO films with a transmission of 77 to 92% in the infrared. The values of optical gaps Eg vary between 3.273 - 3.256 eV. The peak of photoluminescence exhibited a visible emission peak at 616nm that refers to possibility of using thin films as an effective medium of random laser.


Artificial intelligence review:
Research summary
تناول البحث تحضير أغشية رقيقة من أكسيد الزنك (ZnO) باستخدام طريقة السول-جل، ودراسة خواصها البنيوية والضوئية. تم تحضير الأغشية على ركائز زجاجية بسماكات مختلفة، واستخدمت خلات الزنك المائية كمصدر رئيسي لشوارد الزنك. تم تحليل مورفولوجيا السطح باستخدام مجهر القوة الذرية (AFM)، ووصفت الأغشية بنيوياً بواسطة طيف انعراج الأشعة السينية (XRD)، والتحليل العنصري بواسطة مطيافية تشتت الطاقة للأشعة السينية (EDX). أظهرت النتائج أن الأغشية المحضرة ناعمة ومتجانسة، خاصة عند السماكات العالية، وأن الحبيبات الناتجة على السطح تأخذ شكل قضبان نانوية بمتوسط قطر 240 نانومتر. أظهر طيف XRD أن التوجه البلوري السائد للغشاء المحضر هو (112) بمتوسط حجم بلوري 19 نانومتر. بينت الأطياف الضوئية أن الأغشية المحضرة شفافة بنفاذية تتراوح بين 77% و92% في منطقة المرئي وتحت الأحمر. تم حساب الفجوة الطاقية المباشرة للأغشية المحضرة وتراوحت بين 3.256 و3.273 إلكترون فولت. أظهرت مطيافية التألق الضوئي وجود قمم إصدار عند الأطوال الموجية 616 نانومتر و648 نانومتر، مما يجعلها مرشحة لاستخدامها كوسط فعال لليزر العشوائي.
Critical review
دراسة نقدية: يعتبر البحث خطوة مهمة في مجال تحضير الأغشية الرقيقة من أكسيد الزنك ودراسة خواصها البنيوية والضوئية. ومع ذلك، يمكن تقديم بعض الملاحظات لتحسين البحث. أولاً، كان من الأفضل تضمين مقارنة مع نتائج أبحاث سابقة لتوضيح مدى التقدم المحرز. ثانياً، يمكن توسيع الدراسة لتشمل تأثير عوامل أخرى مثل درجة الحرارة ومدة التحضير على خصائص الأغشية. ثالثاً، كان من الممكن تقديم تحليل أعمق للنتائج الضوئية وربطها بتطبيقات عملية محددة. وأخيراً، يمكن تعزيز البحث ببيانات تجريبية إضافية لتأكيد النتائج وتوسيع نطاق الدراسة لتشمل مواد أخرى مشابهة.
Questions related to the research
  1. ما هي الطريقة المستخدمة لتحضير أغشية أكسيد الزنك في هذا البحث؟

    تم استخدام طريقة السول-جل لتحضير أغشية أكسيد الزنك في هذا البحث.

  2. ما هي الأدوات المستخدمة لتحليل مورفولوجيا السطح للأغشية المحضرة؟

    تم استخدام مجهر القوة الذرية (AFM) لتحليل مورفولوجيا السطح للأغشية المحضرة.

  3. ما هي الفجوة الطاقية المباشرة للأغشية المحضرة؟

    تراوحت الفجوة الطاقية المباشرة للأغشية المحضرة بين 3.256 و3.273 إلكترون فولت.

  4. ما هي الأطوال الموجية التي أظهرت قمم إصدار في مطيافية التألق الضوئي؟

    أظهرت مطيافية التألق الضوئي قمم إصدار عند الأطوال الموجية 616 نانومتر و648 نانومتر.


References used
No references
rate research

Read More

In the present paper, we discuss the influence of point defects on electrical and optical characteristics of ZnO thin films grown by the atomic layer deposition (ALD) method on glass and silicon substrates at low temperature (100°C). Room temperatu re photoluminescence (RT PL) spectra, secondary ion mass spectroscopy (SIMS), and Hall Effect measurements were made for as-grown ZnO layers. The annealing process was performed in air as well as in N2 atmosphere at 400°C for half an hour. The long annealing resulted in a larger reduction in electron concentration. Simultaneously, an evident increase in carrier's mobility was observed, which may suggest that annealing resulted in a decreased number of native defects in the ZnO layers. Also, it was observed that hydrogen atoms in ZnO samples did not dominate their electrical properties with the increase of electrons concentration.
A study of surface chemical composition has been performed by using Auger Electron Spectroscopy (AES) for ZnO layers grown by Atomic Layer Deposition (ALD) procedure.Elements on surface of materials were identified,and, an atomic concentration of ele ments on surface was determinate. Onlysmall amount of carbon or carbon compounds detected, easily removed by argon ion sputtering. Also, long argon ion sputtering partly depleted surface of oxygen.
The work could be considered as a continuous study of (XRL) X – ray luminescence - spectra of pure, and mixed Zno different AL ions, In these films and other crystals powders prepared by new developed te chnology. We studied the pure and ZnO thin films. mixed with an AL - ions in the fielol (200-700)nm ,at different weig hrs (5,10,15,20)wt% prepared by thermal evaporation. This way is cheep and a simple technology. Our study showed different spectra peaks at the wavelengths(335,410,521)nm anol (t=20ns)produced, at different peaks intensities of the prepared thin films, compared with those jure and mixeol ZnO ones, spray pyrolysis. Thin films technology, have many wide scientific application, in the medical field, Lazer technology, Luminscence counters, and at the solar cells fields
There are wide uses of tin oxide thin films, especially in the field of transparent conductors, solar cells, gas sensors and piezoelectric materials. Laser deposition is considered one of the most important techniques followed to obtain these film s. In this research, we develop a technique to obtain homogeneous thin films of tin oxide depending on vaporization of pile targets of this oxide by continuous CO2 laser in the atmosphere, with a fan which guarantees obtaining homogenous films. Some of these films were annealed in different conditions. The optical microscope images revealed the presence of high degree of homogeneity, while the X-Ray study showed different crystallization grain orientations which depend on the preparation conditions. The preferred direction is (110). The optical absorption gives information about the value of the effective band gal for the samples before and after thermal annealing. We have found that some films have Eg = 3.2 ev. before annealing, and after long annealing they have Eg=1.3ev. In addition, the hard annealed thin films reveal anisotropy in the optical and electrical. Characteristics, they have different absorption coefficients in two perpendicular directions, also there is an electrical resistance anisotropy along these two directions especially after hard annealing. The Eb was 0.73 ev before annealing, it became 0.37 ev for one direction and 0.32 ev for the other direction.
This research was carried during the period of (2010-2013) to study the possibility of benefiting from the raw seaweeds residuse accumulated on the Syrian beach in obtaining an alternative substrates instead of the traditional one for using in nurseries, especially forestry, and thus reducing the peat moss importation and saving the currency, at the same time salvation the environment from the organic plant waste and and improve the seashores appearance .

suggested questions

comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا