Silicon and silicon-germanium nanoparticles obtained by Pulsed Laser Deposition

Stock, F.; Diebold, L.; Antoni, F.; Gowda, Chinmayee Chowde; Müller, D.; Haffner, T.; Pfeiffer, Pierre; Roques, S.; Mathiot, D.

doi:10.1016/j.apsusc.2018.10.064

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…The SiGe NC-based structures that are usually reported in the literature are either thin films of SiGe only , or thin films and multilayer structures with SiGe NCs embedded in different oxide matrices, ,− the most commonly used being SiO 2 . Using films of the polycrystalline SiGe alloy only is disadvantageous because of the nonradiative recombination centers formed at the crystal grain boundaries, decreasing the photogenerated carrier density.…”

Section: Introductionmentioning

confidence: 99%

“…22 The SiGe NC band gap can be tuned by alloying of Ge and Si with different compositions, 23 by changing NC size, shape, 22 and crystalline structure, 24 leading to the improvement of the electronic and optical properties. The SiGe NC-based structures that are usually reported in the literature are either thin films of SiGe only 25,26 or thin films and multilayer structures with SiGe NCs embedded in different oxide matrices, 13,27−30 the most commonly used being SiO 2 . Using films of the polycrystalline SiGe alloy only is disadvantageous because of the nonradiative recombination centers formed at the crystal grain boundaries, 26 decreasing the photogenerated carrier density.…”

Section: ■ Introductionmentioning

confidence: 99%

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Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers

et al. 2020

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Continuous development of Si photonics requires ecological and cost-effective materials. In this work, SiGe nanocrystals (NCs) embedded in TiO2 are investigated as a photosensitive material for visible (VIS) to short-wave infrared (SWIR) broad-range detection. The TiO2 matrix has the advantage of a lower band gap than SiO2, facilitating transport of photogenerated carriers in NCs. The advantage of SiGe NCs over Ge NCs is emphasized by elucidating the mechanisms involved in rapid thermal annealing (RTA)-induced nanocrystallization. An efficiently increased NC stabilization is achieved by avoiding the detrimental fast Ge diffusion. For this, the structure, morphology, and composition were carefully characterized by high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Raman spectroscopy. Two types of structures were investigated, a film of SiGe–TiO2 alloy and a multilayer of a stack of six SiGe/TiO2 pairs. The layers have been deposited on Si wafers using magnetron sputtering of Si, Ge, and TiO2 followed by RTA in an inert atmosphere. The stabilization of SiGe NCs is achieved by the formation during RTA of protective SiO2 thin layers through Si oxidation at the SiGe NC surface, acting as a barrier for Ge diffusion. Thus, embedded Ge-rich SiGe NCs are obtained, resulting in the SWIR extension of the spectral photocurrent up to 1700 nm for films and 1600 nm for multilayers. This study has shown that in multilayers, the local anisotropy of crystallization is compensated by the stress field developed in the SiGe lattice, highly visible in the bottom part. Also, SiGe crystallizes faster than TiO2 in the rutile phase, and therefore, TiO2 remains mainly amorphous.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers

et al. 2020

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“…As shown in Fig. 4b, peaks at 281-292 cm −1 , 484-495 cm −1 , and 388-413 cm −1 can be attributed to the phonon modes of Ge−Ge, Si−Si and Ge−Si bonds 44,45 , respectively. Peaks at~640 and~730 cm −1 can be assigned to Si−H bonds 46 , and broad peaks at~2100 cm −1 are assigned to Si−H 2 , which is present only at the sides of silicon nanosheets 46,47 .…”

Section: Resultsmentioning

confidence: 91%

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

et al. 2020

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The discovery of graphene and graphene-like two-dimensional materials has brought fresh vitality to the field of photocatalysis. Bandgap engineering has always been an effective way to make semiconductors more suitable for specific applications such as photocatalysis and optoelectronics. Achieving control over the bandgap helps to improve the light absorption capacity of the semiconductor materials, thereby improving the photocatalytic performance. This work reports two-dimensional −H/−OH terminal-substituted siligenes (gersiloxenes) with tunable bandgap. All gersiloxenes are direct-gap semiconductors and have wide range of light absorption and suitable band positions for light driven water reduction into H 2 , and CO 2 reduction to CO under mild conditions. The gersiloxene with the best performance can provide a maximum CO production of 6.91 mmol g −1 h −1 , and a high apparent quantum efficiency (AQE) of 5.95% at 420 nm. This work may open up new insights into the discovery, research and application of new two-dimensional materials in photocatalysis.

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“…Moreover, the PLD technique can be easily adapted to increase the range of applications: by limiting the number of pulses, one can deposit nanoparticles instead of thin films [113]. Two targets of different materials can be irradiated simultaneously and the intermixing plasma plumes can create a compositional library on a substrate [114].…”

Section: Methods Overviewmentioning

confidence: 99%

Current Status on Pulsed Laser Deposition of Coatings from Animal-Origin Calcium Phosphate Sources

Duta

Popescu

2019

Coatings

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The aim of this paper is to present the current status on animal-origin hydroxyapatite (HA) coatings synthesized by Pulsed Laser Deposition (PLD) technique for medical implant applications. PLD as a thin film synthesis method, although limited in terms of surface covered area, still gathers interest among researchers due to its advantages such as stoichiometric transfer, thickness control, film adherence, and relatively simple experimental set-up. While animal-origin HA synthesized by bacteria or extracted from animal bones, eggshells, and clams was tested in the form of thin films or scaffolds as a bioactive agent before, the reported results on PLD coatings from HA materials extracted from natural sources were not gathered and compared until the present study. Since natural apatite contains trace elements and new functional groups, such as CO32− and HPO42− in its complex molecules, physical-chemical results on the transfer of animal-origin HA by PLD are extremely interesting due to the stoichiometric transfer possibilities of this technique. The points of interest of this paper are the origin of HA from various sustainable resources, the extraction methods employed, the supplemental functional groups, and ions present in animal-origin HA targets and coatings as compared to synthetic HA, the coatings’ morphology function of the type of HA, and the structure and crystalline status after deposition (where properties were superior to synthetic HA), and the influence of various dopants on these properties. The most interesting studies published in the last decade in scientific literature were compared and morphological, elemental, structural, and mechanical data were compiled and interpreted. The biological response of different types of animal-origin apatites on a variety of cell types was qualitatively assessed by comparing MTS assay data of various studies, where the testing conditions were possible. Antibacterial and antifungal activity of some doped animal-origin HA coatings was also discussed.

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Silicon and silicon-germanium nanoparticles obtained by Pulsed Laser Deposition

Cited by 10 publications

References 18 publications

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

Current Status on Pulsed Laser Deposition of Coatings from Animal-Origin Calcium Phosphate Sources

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Silicon and silicon-germanium nanoparticles obtained by Pulsed Laser Deposition

Cited by 10 publications

References 18 publications

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO2 Films and Multilayers

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO2 Films and Multilayers

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

Current Status on Pulsed Laser Deposition of Coatings from Animal-Origin Calcium Phosphate Sources

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Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers

Influence of SiGe Nanocrystallization on Short-Wave Infrared Sensitivity of SiGe–TiO₂ Films and Multilayers