Luminescent Si quantum dots in flexible and semitransparent membranes for photon down converting material

Morales-Morales, F.; Palacios-Huerta, L.; Cabañas-Tay, S.A.; Coyopol, A.; Morales-Sánchez, A.

doi:10.1016/j.optmat.2019.02.043

Cited by 11 publications

(8 citation statements)

References 52 publications

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“…The synthesis of Si-NCs at low temperature is required in Si-based technology since hightemperature process steps can affect the operation of the final circuit. On the other hand, the synthesis of functional hybrid inorganic-organic materials has become an interesting subject for the development of flexible electronic technology [18,19]. Si-NCs/polymer composites have also been used as down-converting layers to enhance the efficiency of organic SCs [20].…”

Section: Introductionmentioning

confidence: 99%

“…Si-NCs/polymer composites have also been used as down-converting layers to enhance the efficiency of organic SCs [20]. A simple method to obtain highly PL Si-NCs is the electrochemical etching of a silicon wafer, which forms a porous silicon (PSi) film [18,21]. Si-NCs are embedded in the SiO x (x < 2) pillars that form the PSi film [2,18].…”

Section: Introductionmentioning

confidence: 99%

“…A simple method to obtain highly PL Si-NCs is the electrochemical etching of a silicon wafer, which forms a porous silicon (PSi) film [18,21]. Si-NCs are embedded in the SiO x (x < 2) pillars that form the PSi film [2,18]. Since PSi is a fragile material, Si-NC powders can be easily extracted through mechanical exfoliation and then embedded in an organic matrix to obtain a flexible membrane [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Since PSi is a fragile material, Si-NC powders can be easily extracted through mechanical exfoliation and then embedded in an organic matrix to obtain a flexible membrane [22,23]. However, most of the reported PSi films synthesized by electrochemical etching exhibit red-orange PL [2,18,[23][24][25][26] with low intensity, and, in some cases, the PL quenches in time [27,28]. Multiple studies have been devoted to stabilizing, increasing, and modulating the PL of PSi by changing the synthesis parameters [18,22,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Effect of Nitric Acid in Electrochemically Synthesized Silicon Nanocrystals: Tunability of Bright and Uniform Photoluminescence

et al. 2022

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In this work, we show a correlation between the composition and the microstructural and optical properties of bright and uniform luminescent porous silicon (PSi) films. PSi films were synthesized by electrochemical etching using nitric acid in an electrolyte solution. PSi samples synthesized with nitric acid emit stronger (up to six-fold greater) photoluminescence (PL) as compared to those obtained without it. The PL peak is shifted from 630 to 570 nm by changing the concentration ratio of the HF:HNO3:(EtOH-H2O) electrolyte solution, but also shifts with the excitation energy, indicating quantum confinement effects in the silicon nanocrystals (Si-NCs). X-ray photoelectron spectroscopy analysis shows a uniform silicon content in the PSi samples that emit the strongest PL. High-resolution transmission electron microscopy reveals that the Si-NCs in these PSi samples are about ~2.9 ± 0.76 nm in size and are embedded in a dense and stoichiometric SiO2 matrix, as indicated by the Fourier transform infrared analysis. On the other hand, the PSi films that show PL of low intensity present an abrupt change in the silicon content depth and the formation of non-bridging oxygen hole center defects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Effect of Nitric Acid in Electrochemically Synthesized Silicon Nanocrystals: Tunability of Bright and Uniform Photoluminescence

et al. 2022

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“…Consequently, the signal-to-noise performance of detectors may improve [18]. Moreover, luminescent silicon quantum dots embedded in free-standing PS and PS MFs infiltered with CdSe/ZnS and AgInS 2 /ZnS quantum dots have been reported [21][22][23]. The localized mode of the PS MF was tuned experimentally to match the emission spectra of CdSe/Zn and AgInS 2 /ZnS quantum dots to achieve enhanced photoluminescence.…”

mentioning

confidence: 99%

Porous Si-SiO2 UV Microcavities to Modulate the Responsivity of a Broadband Photodetector

et al. 2020

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Porous Si-SiO2 UV microcavities are used to modulate a broad responsivity photodetector (GVGR-T10GD) with a detection range from 300 to 510 nm. The UV microcavity filters modified the responsivity at short wavelengths, while in the visible range the filters only attenuated the responsivity. All microcavities had a localized mode close to 360 nm in the UV-A range, and this meant that porous Si-SiO2 filters cut off the photodetection range of the photodetector from 300 to 350 nm, where microcavities showed low transmission. In the short-wavelength range, the photons were absorbed and did not contribute to the photocurrent. Therefore, the density of recombination centers was very high, and the photodetector sensitivity with a filter was lower than the photodetector without a filter. The maximum transmission measured at the localized mode (between 356 and 364 nm) was dominant in the UV-A range and enabled the flow of high energy photons. Moreover, the filters favored light transmission with a wavelength from 390 nm to 510 nm, where photons contributed to the photocurrent. Our filters made the photodetector more selective inside the specific UV range of wavelengths. This was a novel result to the best of our knowledge.

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Nanocrystalline Semiconductors: Optical Properties

Meijerink

Vanmaekelbergh

Bol

et al. 2019

Reference Module in Materials Science and Materials Engineering

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Luminescent Si quantum dots in flexible and semitransparent membranes for photon down converting material

Cited by 11 publications

References 52 publications

Study of the Effect of Nitric Acid in Electrochemically Synthesized Silicon Nanocrystals: Tunability of Bright and Uniform Photoluminescence

Study of the Effect of Nitric Acid in Electrochemically Synthesized Silicon Nanocrystals: Tunability of Bright and Uniform Photoluminescence

Porous Si-SiO2 UV Microcavities to Modulate the Responsivity of a Broadband Photodetector

Nanocrystalline Semiconductors: Optical Properties

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