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Type: Artigo de periódico
Title: Characterization of Silicon Rich Oxides with Tunable Optical Band Gap on Sapphire Substrates by Photoluminescence, UV/Vis and Raman Spectroscopy
Author: Kiebach, R
Luna-Lopez, JA
Dias, GO
Aceves-Mijares, M
Swart, JW
Abstract: A detailed analysis of the optical properties of silicon rich oxides (SRO) thin films and the factors that influence them is presented. SRO films with different Si content were synthesized via LPCVD (low pressure chemical vapor deposition) on sapphire substrates. Photoluminescence (PL), UV/Vis and Raman spectroscopy were used to characterize the samples. An intense emission in blue region was found. An interesting fact is that the optical band gap correlates linearly with the reactants ratio, which allows the tuning of the band gap. The influence of parameters such as substrate, Si content, annealing temperature and annealing time on the optical properties are discussed and the possible mechanisms of the photoluminescence are compared with our experimental data.
Subject: Silicon rich oxides
optical properties
Silicon nano crystals
nanostructured materials
Raman spectroscopy
silicon rich oxides
Country: México
Editor: Soc Quimica Mexico
Citation: Journal Of The Mexican Chemical Society. Soc Quimica Mexico, v. 52, n. 3, n. 212, n. 218, 2008.
Rights: aberto
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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