Nature of visible luminescence of co-sputtered Si–SiOx systems

Torchynska, T. V.; Espinoza, F.G. Becerril; Goldstein, Y.; Savir, E.; Jędrzejewski, J.; Khomenkova, L.; Korsunska, N.; Yukhimchuk, V. A.

doi:10.1016/j.physb.2003.09.235

Cited by 16 publications

(27 citation statements)

References 15 publications

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“…And the ones for orange (O-4) and green (G-5) PL band intensities show the maxima at the same Si content, which is lower than for R and IR bands. The spectral peak positions of the IR-1, R-3, O-4 and G-5 PL bands do not depend on Si content [1,7,8] while IR-2 peak position shifts to high energy side with C Si decrease (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

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Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems

Espinoza

Torchynska

Goldstein

et al. 2005

phys. stat. sol. (c)

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PACS 78.55.Hx, 78.67.Hv In this paper the room temperature photoluminescence (PL) and its temperature dependence in 80-300 K range have been investigated for magnetron co-sputtered Si-rich-SiO x systems with Si nanocrystallites. It is shown that PL spectra consist of the five PL bands peaked at 1.32-1.39, 1.42-1.58, 1.70-1.80, 2.05 and 2.30 eV. The PL band with peak at 1.42-1.58 eV is attributed to exciton recombination in Si nanocrystallites. It was shown the well enough correlation between theoretical estimation and experimental data for exciton transition energies in Si nanocrystallites with the sizes of 3.5-5.0 nm. For smaller Si nanocrystallites (2.5 nm) the difference between experimental and calculated values of exciton transition energy is noticeable. The three visible bands are assigned to oxide related defects.

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Section: Resultsmentioning

confidence: 99%

“…This allows attributing IR-2 band to exciton recombination inside Si NCs. Actually as Raman scattering investigation showed [1,7,8] the decrease of Si content from 61% to 32 % leads to decrease of Si NCs sizes from 5 nm to 2.7 nm.…”

Section: Resultsmentioning

confidence: 99%

Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems

Espinoza

Torchynska

Goldstein

et al. 2005

phys. stat. sol. (c)

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“…Both molecules are silane monomers of the type (OR) 3 Si-Si(OR) 3 , where -OR is a hydrolysable ethoxy or methoxy group, respectively. It is known that the kinetics of the hydrolysis and condensation reactions strongly depends on the solution pH [35].…”

Section: Mechanisms Behind the Materials Synthesesmentioning

confidence: 99%

“…Considering just the solution pH and taking into account that -OR groups are more electron donating than hydroxyl groups (-OH), the more -OR groups replaced by -OH groups, the less stabilized the transition state (Scheme 1, 2), and so the hydrolysis reaction rate decreases in the order of (OR) 2 3 Si-Si(OH) 3 ). This makes the first hydrolysis reaction to be the fastest and the generated -OH group rapidly condense with another -OH group to give rise to a siloxane (:Si-O-Si:) species (Scheme 2, 4), in turn liberating a water molecule.…”

Section: Mechanisms Behind the Materials Synthesesmentioning

confidence: 99%

“…Even though the luminescent properties of silicon oxide (SiO 2 ) have been known for decades, it was not really after the discovery of room temperature visible photoluminescence from porous silicon [1], that countless studies, focused on silicon-based light-emitting materials, have been published worldwide [2][3][4][5][6][7][8]. The efforts have been directed to incorporate optoelectronic capabilities to the mature and well developed microelectronic technology.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of sol–gel SiO2-based materials using alkoxydisilane precursors: mechanisms and luminescence studies

Fernández‐Sánchez

Rodríguez

Domı́nguez

2014

J Sol-Gel Sci Technol

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This work reports on the mechanisms behind the sol-gel synthesis and versatile luminescent behavior of sol-gel silica-based materials based on hexamethoxydisilane (Hexamet) or hexaethoxydisilane (Hexaet) innocuous monomers, at different annealing temperatures. The resulting as-synthesized materials exhibit an intense photoluminescence (PL) band in the blue region of the spectrum, whose maximum shifted in the region of 430-650 nm by applying an annealing process at different temperatures in the range of 350-1,000°C. This behavior could be attributed to the presence of different silica matrix defect-related luminescent mechanisms. PL emission bands of the Hexamet-derived materials prepared at higher T up to 1,300°C slightly shifted and appeared in the region of 400-700 nm. However, those Hexaet-derived materials annealed at T between 1,000-1,150°C showed bands peaking at and above 800 nm, these being related to a quantum confinement effect induced by the presence of silicon nanocrystals (Si_nc) within the polymer matrix. Based on studies carried out by different microscopy and chemical analysis techniques, the origin of the PL behavior was attributed to the kinetics of the hydrolysis and condensation reactions being different for each monomer, which generate different intermediates and eventual structures during the annealing process. The superior tunable luminescent performance of these environmentallyfriendly materials provides them with the potential for the fabrication of silicon-based light sources.

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Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

Dutt,

Salinas,

Martínez-Tolibia

et al. 2023

Advanced Photonics Research

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After the first visible photoluminescence (PL) from porous silicon (pSi), continuous efforts are made to fabricate Si‐based compound nanomaterials embedded in matrices such as oxide, nitride, and carbide to improve optical performance and industrial acceptability. These nanomaterials’ functional and desired properties (nanoparticles and quantum dots embedded in matrices) can vary significantly when embedded in technologically relevant matrices. However, exploring the exact emission mechanisms is one of the remaining challenges from the past few decades. To cover this gap, this review discusses the morphological and optoelectronic properties of Si‐based compound nanomaterials and their correlation with the quantum confinement effect and different surface states to find precise emission mechanisms. One of the biggest challenges of using silicon nanomaterials in the biological sector is the development of sensitive materials of low/acceptable toxicity for identifying target analytes either inside/outside the biological platforms. In this scenario, silicon‐based compound matrices can offer different characteristics and advantages depending on their size configurations and PL emission mechanisms. On the other hand, a proper understanding of these multifaceted silicon nanomaterials’ optical properties (emission mechanisms) can be exploited for pathogen detection and in situ applications in cells and tissues, embarking on a new era of bioimaging technology.

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Nature of visible luminescence of co-sputtered Si–SiOx systems

Cited by 16 publications

References 15 publications

Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems

Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems

Synthesis of sol–gel SiO2-based materials using alkoxydisilane precursors: mechanisms and luminescence studies

Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

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Nature of visible luminescence of co-sputtered Si–SiOx systems

Cited by 16 publications

References 15 publications

Defect and nano‐crystallite photoluminescence in Si‐SiO x systems

Defect and nano‐crystallite photoluminescence in Si‐SiO x systems

Synthesis of sol–gel SiO2-based materials using alkoxydisilane precursors: mechanisms and luminescence studies

Silicon Compound Nanomaterials: Exploring Emission Mechanisms and Photobiological Applications

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Product

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Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems

Defect and nano‐crystallite photoluminescence in Si‐SiO _x systems