کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7840354 | 1505867 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reversible quenching of photoluminescence in stain etched porous silicon at HNO3 posttreatment and role of oxygen bonds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effect of posttreatment in HNO3 at room temperature on the photoluminescence properties and surface chemical bonds of stain etched porous silicon were investigated. It was shown that, such posttreatment results in reversible quenching of photoluminescence. Investigation of the FTIR spectra showed that this posttreatment allows dividing usually occurring simultaneously processes of hydrogen desorption and surface oxidation in two separate processes. It is found that the photoluminescence quenching associated with significant desorption of hydrogen from the surface of porous silicon under the HNO3 action, and its subsequent recovery associated with surface oxidation in air. This recovery of luminescence is correlated with the appearance of absorption on the oxygen bonds at 1180Â cmâ1 and 1045Â cmâ1. Stability of photoluminescence peak position, despite of changing intensity, both in treated and untreated samples, during exposure to air, correlates with the absorption stability on the oxygen bonds at 1108Â cmâ1 and 882Â cmâ1. These oxygen bonds arise during the formation of stain etched porous silicon and are present in the luminescent and nonluminescent samples. Thus, these oxygen bonds can lead to the occurrence of local levels in the bandgap of silicon nanocrystallites, creating radiative recombination centers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 195, March 2018, Pages 49-53
Journal: Journal of Luminescence - Volume 195, March 2018, Pages 49-53
نویسندگان
Farhad A. Rustamov, Namiq H. Darvishov, Vidadi E. Bagiev, Mubariz Z. Mamedov, Goncha M. Eyvazova, Evgeniya Y. Bobrova, Hacar O. Qafarova,