کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1552922 | 1513215 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The influence of growth temperature on structural and optical properties of sputtered ZnO QDs embedded in SiO2 matrix
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The influence of growth temperature on structural and optical properties of sputtered ZnO QDs embedded in SiO2 matrix The influence of growth temperature on structural and optical properties of sputtered ZnO QDs embedded in SiO2 matrix](/preview/png/1552922.png)
چکیده انگلیسی
We report the influence of growth temperature on surface morphology, structural and optical properties of ZnO QDs embedded with SiO2/Si matrix fabricated by radio frequency (RF) magnetron sputtering method. The fragmentation due to elastic strain relaxation compensate adatom diffusion length at higher temperature causes the decrement of the ZnO QDs sizes from â¼41 nm to â¼12 nm and number density enhancement from â¼0.2 to â¼15.4 Ã 1010 cmâ2 by increasing the growth temperature. ZnO QDs shows a well-defined hexagonal close packed wurtzite structure with lattice parameters close to those of bulk ZnO, confirming their high crystalline quality. Increasing growth parameters causes to decrease the lattice parameters due to change in interatomic distances explained by elimination of defects and structural relaxation. The room temperature photoluminescence (PL) spectra shows strong UV accompanied by weaker green peak originated from recombination of free excitons and dominative deep-level emissions respectively. As the growth temperature increased to 500 °C, an emission intensity in the ultraviolet and green region enhanced which is due to increment in the numbers of photo-carriers by increasing the number density of QDs. Calculated band gap using an optical transmittance measurement indicates that the bandgap shift to higher energies is not taken placed because of large size of dots. The Urbach energy increases considerably in samples with increasing growth temperature which is attributed to higher degree of surface disorder in smaller QDs. The excellent features of the results suggest that our systematic analysis method may constitute a basis for the tunable growth of ZnO QDs suitable in nanophotonics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 86, October 2015, Pages 134-142
Journal: Superlattices and Microstructures - Volume 86, October 2015, Pages 134-142
نویسندگان
Alireza Samavati, Zulkafli Othaman, S.K. Ghoshal, M.K. Mustafa,