Abstract
Transformation of the photoluminescence (PL) spectra of hybrid Si/SiOx nanoparticles of the crystalline core–oxide shell type has been investigated in the temperature range of 10–320 K upon 325-nm laser excitation. Si/SiOx nanoparticles are synthesized from silicon monoxide and functionalized in dimethyl sulfoxide (DMSO) or octadecene (OD). The PL spectra of the nanoparticles are considered as superpositions of short-wavelength (400–550 nm) and long-wavelength (600–900 nm) bands, which have significantly different ratios of the total intensities of these components in Si/SiOx/OD and Si/SiOx/DMSO samples. For Si/SiOx/DMSO samples, the intensity of the short-wavelength band monotonically decreases with an increase in temperature from 10 K, whereas the intensity of the long-wavelength band first increases; however, then (at approximately 70 K) its slope begins to decrease and levels off. The specific features of the temperature dependence of the long-wavelength PL band intensity can be explained in this case by efficient energy transfer from defect oxygen-containing centers at the core boundary to exciton centers that arise under laser irradiation. In the case of Si/SiOx/OD particles, for which the short-wavelength band intensity is initially low, this effect is not observed. For these particles, the influence of 405-nm cw laser radiation on the kinetics of changes in the intensity of the long-wavelength PL band has been studied beginning with a temperature of 10 K. It has been found that the PL intensity increases at temperatures near 10 K with an increase in the exposure time, which is explained by additional heating of nanoparticles in a vacuum.
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ACKNOWLEDGMENTS
We are grateful to S.G. Dorofeev, employee of the Department of Chemistry, Moscow State University, for supplying nanosilicon sols.
Funding
This study was supported by the Russian Foundation for Basic Research, project no. 16-29-11741 ofi-m, and the Ministry of Science and Higher Education of the Russian Federation within government contract with the Federal Scientific Research Center Crystallography and Photonics (Russian Academy of Sciences) in the part concerning the measurements of low-temperature photoluminescence spectra of silicon nanoparticles.
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Dedicated to the memory of V.N. Bagratashvili
Translated by A. Sin’kov
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Rybaltovskii, A.O., Zavorotnyi, Y.S., Lotin, A.A. et al. The Effect of Temperature on the Photoluminescence of Hybrid Si/SiOx Nanoparticles. Nanotechnol Russia 14, 82–89 (2019). https://doi.org/10.1134/S1995078019010099
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DOI: https://doi.org/10.1134/S1995078019010099