Local vibrational modes of vacancy-oxygen-related complexes at room temperature
https://doi.org/10.29235/1561-2430-2020-56-4-480-487
Abstract
The isotopic content of natural silicon (28Si (92.23 %), 29Si (4.68 %) и 30Si (3.09 %)) affects noticeably the shape of IR absorption bands related to the oxygen impurity atoms. In the present work an attempt is undertaken to determine the positions of local vibrational modes (LVMs), related to quasimolecules 28Si16OS29Si and 28Si16OS30Si (OS – substitutional oxygen atom), for the absorption spectra measured at room temperature. An estimation of the isotopic shifts of corresponding modes is done by fitting the shape of the experimentally measured absorption band related to the vacancy–oxygen center in irradiated Si crystals. The LVM isotope shifts are found to be equal 2,2 ± 0.25 cm–1 for 28Si-16OS29Si and 4,3 ± 0,9 см–1 for 28Si-16OS30Si in relation to the basic band due to 28Si-16OS28Si, and the full width at half maximum of the A-center absorption band (28Si-16OS28Si) is 5,3 ± 0.25 cm–1. By means of infrared absorption spectroscopy a clear correlation between the disappearance of the divacancy (V2) in the temperature range 200–275 ºС and appearance of two absorption bands with their maxima at 825.8 and 839.2 cm–1 in irradiated oxygen-rich Si crystals is found. The band positioned at 825.8 cm–1 is assigned to a divacancy-oxygen defect V2O formed via an interaction of mobile V2 with interstitial oxygen (Oi ) atoms. The 839.2 cm–1 band is much more pronounced in neutron irradiated samples as compared to samples irradiated with electrons. We argue that it is related to a trivacancy–oxygen defect (V3O) formed via an interaction of mobile V3 with Oi atoms.
About the Authors
E. A. Tolkacheva
Научно-практический центр Национальной академии наук Беларуси по материаловедению
Belarus
Belarus
Ekaterina A. Tolkacheva – Ph. D. (Physics and Mathematics), Senior Researcher
19, P. Brovki Str., 220072, Minsk
V. P. Markevich
The University of Manchester
United Kingdom
United Kingdom
Vladimir P. Markevich – Ph. D. (Physics and Mathematics), Senior Researcher, Photon Science Institute and School of Electrical and Electronic Engineering
Manchester M13 9PL, United Kingdom
L. I. Murin
Scientific and Practical Materials Research Center of the National Academy of Sciences of Belarus
Belarus
Belarus
Leonid I. Murin – Ph. D. (Physics and Mathematics), Leading Researcher
19, P. Brovki Str., 220072, Minsk
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