Germanate glass layer containing Eu3+ ions and gold nanoparticles for enhanced silicon solar cell performance

Gunji, R.M.; Santos, E.V.de A.; Bordon, C.D.S.; Garcia, J. M.; Malagón, Luis Arturo Gómez; Kassab, L.R.P.

doi:10.1016/j.jlumin.2020.117497

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…In some cases, when the PL bands of Ag NCs and those of rare-earth ions are mixed, white light generation and tunable visible light can take place depending on the excitation wavelength. Potential applications of rare-earth ions doped GeO 2 -PbO glasses with metallic NPs were reported in the literature as waveguides to operate in the infrared region based on fs laser irradiation [ 23 ] and on the pedestal architecture [ 24 ] cover layer to enhance Si solar cell efficiency [ 25 ] and devices to promote white light emission [ 26 ]. However, GeO 2 -based glasses with Ag NCs have rarely been investigated, which motivated the present study.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

et al. 2023

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This work investigates the optical properties of Yb3+ ions doped GeO2-PbO glasses containing Ag nanoclusters (NCs), produced by the melt-quenching technique. The lack in the literature regarding the energy transfer (ET) between these species in these glasses motivated the present work. Tunable visible emission occurs from blue to orange depending on the Yb3+ concentration which affects the size of the Ag NCs, as observed by transmission electron microscopy. The ET mechanism from Ag NCs to Yb3+ ions (2F7/2 → 2F5/2) was attributed to the S1→T1 decay (spin-forbidden electronic transition between singlet–triplet states) and was corroborated by fast and slow lifetime decrease (at 550 nm) of Ag NCs and photoluminescence (PL) growth at 980 nm, for excitations at 355 and 405 nm. The sample with the highest Yb3+ concentration exhibits the highest PL growth under 355 nm excitation, whereas at 410 nm it is the sample with the lowest concentration. The restriction of Yb3+ ions to the growth of NCs is responsible for these effects. Thus, higher Yb3+ concentration forms smaller Ag NCs, whose excitation at 355 nm leads to more efficient ET to Yb3+ ions compared to 410 nm. These findings have potential applications in the visible to near-infrared regions, such as tunable CW laser sources and photovoltaic devices.

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Section: Introductionmentioning

confidence: 99%

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

et al. 2023

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“…Spectral modification has been paid great attention in recent years because it has broad application prospects in many fields, including solar cells and agricultural greenhouses [1][2][3][4]. Taking solar cells as an example, spectral mismatch between uneven distribution of solar spectrum and spectral response of solar cells results in the limited conversion efficiency of solar cells [5,6]. In agriculture, shortwave photons that are not useful for plants can be converted into suitable light to promote their growth [7].…”

Section: Introductionmentioning

confidence: 99%

“…Molybdate phosphors have low toxicity, low environmental pollution, good chemical stability, and good luminescent efficiency, which are potential candidates for red phosphors [43]. The MoO 6 6− groups in molybdate phosphors can be excited by ultraviolet light in the range of 300-425 nm. The excitation range can be further adjusted to blue light band via the addition of Sm 3+ [44].…”

Section: Introductionmentioning

confidence: 99%

Down-Conversion Polymer Composite Coatings with Multipeak Absorption and Emission

et al. 2021

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Spectral adjustment is an effective method to increase light conversion efficiency of solar cells and to promote the growth of plants. Down-converter (DC) materials are considered to be one of the most effective methods of spectral modification. The focus of this work was to expand the spectral response range of down-conversion layers to achieve multipeak absorption and emission. Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu, which have different excitation peaks in the UV-blue region and varied emission peaks in visible light regions, were prepared in this work. Sr2CaMoO6:Sm,Na can effectively produce red light at 648 nm upon excitation at 408 nm, while YVO4:Bi,Eu can produce red light at 618 nm upon excitation at 365 nm. Polymeric luminescent coatings with one single kind of phosphor were prepared separately before the two phosphors were mixed together in uniform polymer coatings. The two phosphors were also assembled in bilayer coatings with different concentrations. The results showed that high transmittances over 90% were achieved for the two composite coatings with the thickness of 20 and 30 μm. The increase in particle loadings from 1‰ to 4‰ slightly decreased coating transmittance but increased luminescence intensity. The increase in the ratio of Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu from 5/1 to 10/1 resulted in high transmittance of the DC coatings, independent of total filler loadings (3‰ and 4‰) and coating thickness. The relative intensities of emission peaks can be adjusted conveniently by changing filler ratios. In addition, the transmittance and luminescent intensities of the coatings where the two phosphors were assembled in two layers were close to the uniform coatings, suggesting the negligible effect of UV light irradiation order. This work proved that the prepared coatings presented multipeak absorption and emission upon UV light excitation. These coatings can be expected to be applied in fields such as solar cells and agriculture greenhouses.

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“…Ao longo dos anos os estudos nesta área vêm crescendo exponencialmente com avanços na tecnologia com inúmeras aplicações em biosensores, dispositivos ópticos, dispositivos fotovoltaicos, entre outros. [42,43,44] As NPs metálicas apresentam dimensões em torno de 1-100 nm e a interação de uma onda eletromagnética com os elétrons livres das camadas superficiais deste metal, promove oscilações coletivas destes elétrons, chamadas de plásmons superficiais (PS), cujas frequências de oscilação (frequência de ressonância) dependem do metal, tamanho, forma e hospedeiro [45,46,47]. A representação da interação de uma onda eletromagnética com uma NP metálica é apresentada na figura 2.9, demonstrando o deslocamento da nuvem eletrônica com esta interação.…”

Section: Emissão Em (Nm)unclassified

Influência de incorporação de >i<nanoclusters>/i< de prata nas propriedades ópticas de vidros germanato dopados com íons de Yb>sup<3+>/sup< para aplicações em fotônica.

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The purpose of this work is to produce and characterize GeO2-PbO (GP) glass samples codoped with Yb 3+ ions and silver nanoclusters (silver NCs), and to study the mechanisms of energy transfer between them. The glass samples were produced by the melt-quenching technique followed by rapid cooling to relieve internal stress; additional treatments were performed to promote the growth of silver NCs. The silver NCs and Yb 3+ ions emissions were analyzed with excitation at different wavelengths. The silver NCs emission showed tunable light emission in the visible region of the electromagnetic spectrum for different concentrations of Yb 3+ and also for excitations in the range of 355-410 nm. The dependence of emission tuning on the concentration of Yb 3+ is due to the fact that they normally restrict the size of silver NCs. By analyzing the silver NCs and Yb 3+ ions lifetime, and measuring luminescence, energy transfer mechanisms between them were studied and confirmed. Energy transfer between silver NCs and Yb 3+ ions at 980 nm was observed for excitations at 355 and 410 nm. In the first case, an increase of over 100% in the emission of Yb 3+ ions was observed for the sample 4.5% AgNO3/4.5% Yb2O3, and in the second case, an increase of over 1000% was observed for the sample 4.5% AgNO3/2% Yb2O3 (weight total %). Larger silver NCs are more adequately excited at longer wavelengths, which explains the efficient energy transfer mechanisms for the 4.5% AgNO3/2% Yb2O3 sample when excited at 410 nm. Energy transfer occurs through the S1→T1 decays (spin-forbidden electronic transition between singlet-triplet states) of the silver NCs to the Yb 3+ ions. A decrease in the short and long lifetimes of the silver NCs at 550 nm (for excitations at 355, 380 and 405 nm) and 800 nm (for excitation at 405 nm) was observed in samples co-doped with Yb 3+ ions, compared to the sample doped only with AgNO3, supporting the mentioned energy transfer mechanism. To verify the influence of Yb 3+ ions on the formation of silver NCs, transmission electron microscopy (TEM) measurements were performed, which showed a change in the average size when added Yb 3+ ions (the average size changes from 4.7 to 3.0 and 2.2 nm). These results confirm for the first time the possibility of producing GP glasses with silver NCs and Yb 3+ ions, and the energy transfer mechanism between them, with applications for photonic devices such as devices with tunable light emission, solar cells, and broadband visible light sources.

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Germanate glass layer containing Eu3+ ions and gold nanoparticles for enhanced silicon solar cell performance

Cited by 18 publications

References 35 publications

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

Silver Nanoclusters Tunable Visible Emission and Energy Transfer to Yb3+ Ions in Co-Doped GeO2-PbO Glasses for Photonic Applications

Down-Conversion Polymer Composite Coatings with Multipeak Absorption and Emission

Influência de incorporação de >i<nanoclusters>/i< de prata nas propriedades ópticas de vidros germanato dopados com íons de Yb>sup<3+>/sup< para aplicações em fotônica.

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