Silicon nanoparticles as Raman scattering enhancers

Rodríguez, Isabelle; Shi, Lei; Lu, Xiufen; Korgel, Brian A.; Alvarez-Puebla, Ramón A.; Meseguer, F.

doi:10.1039/c4nr00593g

Cited by 67 publications

(67 citation statements)

References 43 publications

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“…We mention the Raman response from Si‐NP that can be enhanced by magnetic resonance . Furthermore, we recall the Raman amplification of small concentration of p ‐aminobenzoic acid by nonspherical Si‐NP, whereas De Jong et al . using laser‐induced heating of silicon nanocrystals achieved a large increase in the radiative emission rate .…”

Section: Introductionmentioning

confidence: 99%

“…We mention the Raman response from Si-NP that can be enhanced by magnetic resonance. [23] Furthermore, we recall the Raman amplification of small concentration of paminobenzoic acid by nonspherical Si-NP, [24] whereas De Jong et al using laser-induced heating of silicon nanocrystals achieved a large increase in the radiative emission rate. [25] Studying Si-NP, in a preliminary experiment, we detected huge Raman amplification by octahedral faceted Si-NP, but the data were collected in a limited range, with visible light and mainly on samples with few Si-NP per unit area.…”

Section: Introductionmentioning

confidence: 99%

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Strong Raman yield enhancement in large Si nanocrystals from ultraviolet to infrared: Density and shape dependence

Faraci

Italia

Ruggeri

et al. 2019

J Raman Spectroscopy

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Silicon nanocrystals, few hundred nanometers in size, demonstrate impressive Raman yield enhancement. We report, first, the enormous Raman yield enhancement obtained with octahedral‐shaped nanocrystals in a wide wavelength range going from the ultraviolet, through the visible, to the infrared. We observed, along with the main Si peak amplification at 521 cm−1, also the amplification of the 480 cm−1 broad peak of a thin amorphous Si layer embedded between the nanocrystals, together with an amplification of the overall background under both Raman peaks. In order to clarify the mechanism governing the previous enhancements, the previous data were completed exploring the influence of shape by using irregular nanocrystals of similar size. These latter nanocrystals showed an amplified Raman yield, although reduced with respect to those of octahedral shape. Collected data, displayed as a function of the size and density, have been interpreted and discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strong Raman yield enhancement in large Si nanocrystals from ultraviolet to infrared: Density and shape dependence

Faraci

Italia

Ruggeri

et al. 2019

J Raman Spectroscopy

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“…1(b)), either on an opaque or semi-transparent configuration, is analysed taking into account the optimum dielectric material attained in the simple schemes. Dielectric particle composition, shape, and size are selected among those experimentally available [23][24][25][26]. Also, the thicknesses of MAPI films considered are within the range typically employed in the field [27].…”

Section: Introductionmentioning

confidence: 99%

Absorption enhancement in methylammonium lead iodide perovskite solar cells with embedded arrays of dielectric particles

Jiménez‐Solano¹,

Carretero‐Palacios²,

Míguez³

2018

Opt. Express

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In the field of hybrid organic-inorganic perovskite based photovoltaics, there is a growing interest in the exploration of novel and smarter ways to improve the cells light harvesting efficiency at targeted wavelength ranges within the minimum volume possible, as well as in the development of colored and/or semitransparent devices that could pave the way both to their architectonic integration and to their use in the flowering field of tandem solar cells. The work herein presented targets these different goals by means of the theoretical optimization of the optical design of standard opaque and semitransparent perovskite solar cells. In order to do so, we focus on the effect of harmless, compatible and commercially available dielectric inclusions within the absorbing material, methylammonium lead iodide (MAPI). Following a gradual and systematic process of analysis, we are capable of identifying the appearance of collective and hybrid (both localized and extended) photonic resonances which allow to significantly improve light harvesting and thus the overall efficiency of the standard device by above 10% with respect to the reference value while keeping the semiconductor film thickness to a minimum. We believe our results will be particularly relevant in the promising field of perovskite solar cell based tandem photovoltaic devices, which has posed new challenges to the solar energy community in order to maximize the performance of semitransparent cells, but also for applications focusing on architectonic integration.

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“…So far, most of the attention has been devoted to sub 10 nm sized nanocrystals because, thanks to their quantum confinement capabilities, they are suitable for a wide spectrum of mature applications, such as light emitting diodes, flash memories and flat screens6789. Nanocrystals also find extremely important applications in biology and medicine10111213 and in most advanced applications1415.…”

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confidence: 99%

Octahedral faceted Si nanoparticles as optical traps with enormous yield amplification

Mannino

Alberti

Ruggeri

et al. 2015

Sci Rep

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We describe a method for the creation of an efficient optical scatter trap by using fully crystalline octahedral Silicon nanoparticles (Si-NPs) of approximately 100 nanometres in size. The light trapping, even when probing an isolated nanoparticle, is revealed by an enormous amplification of the Raman yield of up to 108 times that of a similar Si bulk volume. The mechanism conceived and optimised for obtaining such a result was related to the capability of a Si octahedron to trap the light because of its geometrical parameters. Furthermore, Si-NPs act as very efficient light scatterers not only for the direct light beam but also for the trapped light after it escapes the nanoparticle. These two effects are observed, either superimposed or separated, by means of the Raman yield and by photoluminescence enhancements. The inductively coupled plasma synthesis process performed at a temperature of only 50°C allows for the ubiquitous use of these particles on several substrates for optical and photovoltaic applications.

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Silicon nanoparticles as Raman scattering enhancers

Abstract: Raman signal enhancement induced by silicon nanoparticles.

Cited by 67 publications

References 43 publications

Strong Raman yield enhancement in large Si nanocrystals from ultraviolet to infrared: Density and shape dependence

Strong Raman yield enhancement in large Si nanocrystals from ultraviolet to infrared: Density and shape dependence

Absorption enhancement in methylammonium lead iodide perovskite solar cells with embedded arrays of dielectric particles

Octahedral faceted Si nanoparticles as optical traps with enormous yield amplification

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