Silicon nanocrystals as fast and efficient light emitters for optical gain

Kůsová, Kateřina

doi:10.1016/j.jnoncrysol.2011.11.027

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…Note that the carboxylation does not drastically change the PL intensity and spectral shape inherent for nc-Si. Another case is amine- or methyl-terminated nc-Si described in [19,20]. The organic groups that are covalently bound to the silicon surface induce a blue shift of the PL peak position.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers

et al. 2012

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A significant enhancement of the photoluminescence (PL) efficiency is observed for aqueous suspensions of porous silicon nanoparticles (PSiNPs) coated by bioresorbable polymers, i.e., polylactic-co-glycolic acid (PLGA) and polyvinyl alcohol (PVA). PSiNPs with average size about 100 nm prepared by mechanical grinding of electrochemically etched porous silicon were dispersed in water to prepare the stable suspension. The inner hydrophobic PLGA layer prevents the PSiNPs from the dissolution in water, while the outer PVA layer makes the PSiNPs hydrophilic. The PL quantum yield of PLGA/PVA-coated PSiNPs was found to increase by three times for 2 weeks of the storage in water. The observed effect is explained by taking into account both suppression of the dissolution of PSiNPs in water and a process of the passivation of nonradiative defects in PSiNPs. The obtained results are interesting in view of the potential applications of PSiNPs in bioimaging.

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Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers

et al. 2012

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Recombination, multiplication, and transfer of electron-hole pairs in silicon nanocrystals: Effects of quantum confinement, doping, and surface chemistry

Derbenyova

Konakov

Бурдов

2021

Journal of Luminescence

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Crystallographic Coalescence of Crystalline Silicon Clusters into Superlattice Structures

Iwata¹,

Tomita²,

Uchida

et al. 2015

Crystal Growth & Design

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The crystallographic coalescence of crystalline silicon clusters into superlattice structures, generated by direct deposition of a silicon cluster beam on a graphene substrate, has been observed. High-resolution transmission electron microscopy and transmission electron diffraction analyses revealed that adjacent silicon clusters in the superlattices, having a mean diameter of 1.61 ± 0.05 nm (n = 109, n indicating the cluster size, Si n ) and an sp 3 diamond structure, form sp 3 covalent bonds between Si atoms on their surfaces and align their atomic crystalline axes, forming crystallographic rows to coalesce into bcc superlattice structures with a lattice constant of 2.134 ± 0.002 nm. The hcp configuration of the silicon clusters with the same lattice constant as the bcc superlattice unit cell is commensurate with the crystallographic structure of the graphene substrate. The absorption spectra confirm the sp 3 diamond structure of the silicon clusters under well-quantized conditions. Oxygen-free unoccupied electronic states (UDOS) in the conduction band of the silicon cluster superlattices appeared at 99.8 eV in the electron energy loss spectroscopy spectra. The s + d UDOS at 107.5 eV in SiO 2 became conspicuous as the oxidation of the specimen advanced. The collective bulk plasmon loss of the virtually oxygen-free silicon cluster superlattice appeared at 16.7 eV.

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Silicon nanocrystals as fast and efficient light emitters for optical gain

Cited by 7 publications

References 26 publications

Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers

Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers

Recombination, multiplication, and transfer of electron-hole pairs in silicon nanocrystals: Effects of quantum confinement, doping, and surface chemistry

Crystallographic Coalescence of Crystalline Silicon Clusters into Superlattice Structures

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