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Appl. Sci. 2017, 7(1), 72; doi:10.3390/app7010072

Luminescent Properties of Silicon Nanocrystals:Spin on Glass Hybrid Materials

1
Departamento de Electronica, Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Tonantzintla, 72840 Cholula, Puebla, Mexico
2
Instituto Politécnico Nacional, CNMN, Avenida Luis Enrique Erro S/N, Zacatenco, Delegación Gustavo Adolfo Madero, C.P. 07738 Ciudad de México, Mexico
3
Centro de Investigación en Materiales Avanzados SC, Unidad Monterrey-PIIT, 66628 Apodaca, Nuevo León, Mexico
*
Authors to whom correspondence should be addressed.
Academic Editor: Paolo Minzioni
Received: 15 October 2016 / Revised: 5 December 2016 / Accepted: 8 December 2016 / Published: 13 January 2017
(This article belongs to the Special Issue Silicon Photonics Components and Applications)
View Full-Text   |   Download PDF [3301 KB, uploaded 13 January 2017]   |  

Abstract

The photoluminescence characteristics of films consisting of Si nanocrystals either coated with or embedded into Spin on Glass (SOG) were studied. Si nanocrystals showing red or blue luminescence when suspended in alcohol solution were obtained from porous silicon films. These were then either deposited in Si substrates and coated with SOG, or mixed in an SOG solution that was later spun on Si substrates. Both types of films were thermally annealed at 1100 °C for three hours in N2 atmosphere. Transmission electron microscopy measurements showed a mean diameter of 2.5 nm for the Si nanocrystals, as well as the presence of polycrystalline Si nanoagglomerates. These results were confirmed by X-ray diffraction studies, which revealed the (111), (220) and (311) Bragg peaks in Si nanocrystals. Fourier transform infrared spectroscopy studies showed that the coated films present higher chemical reactivity, promoting the formation of non-stoichiometric SiO2, while the embedded films behave as a stoichiometric SiO2 after the thermal annealing. The PL (photoluminescence) characterization showed that both embedded and coated films present emission dominated by the Quantum Confinement Effect before undergoing any thermal treatment. After annealing, the spectra were found to be modified only in the case of the coated films, due to the formation of defects in the nanocrystals/SiO2 interface. View Full-Text
Keywords: Si-NCs (silicon nanocrystals); SOG; HRTEM (high resolution transmission electron microscopy); XRD (X-ray diffraction); FTIR (Fourier transform infrared spectroscopy); PL Si-NCs (silicon nanocrystals); SOG; HRTEM (high resolution transmission electron microscopy); XRD (X-ray diffraction); FTIR (Fourier transform infrared spectroscopy); PL
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Vásquez-Agustín, M.A.; Cortazar-Martínez, O.; González-Fernández, A.A.; Andraca-Adame, J.A.; Morales-Sánchez, A.; Aceves-Mijares, M. Luminescent Properties of Silicon Nanocrystals:Spin on Glass Hybrid Materials. Appl. Sci. 2017, 7, 72.

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