Phenomenological quantum confinement models for excitons and phonons applied to photoluminescence and Raman spectra of silicon nanocrystals

2011 ◽  
Vol 248 (11) ◽  
pp. 2724-2727 ◽  
Author(s):  
M. Dossot ◽  
P. Miska ◽  
H. Rinnert ◽  
M. Vergnat ◽  
B. Humbert
Keyword(s):  
Raman Spectra ◽  
Quantum Confinement ◽  
Silicon Nanocrystals

Laser Induced Etching for Generation of Si Nanocrystals and Spectroscopic Investigation of Morphology

2005 ◽  
Vol 23 ◽  
pp. 43-46
Author(s):  
H.S. Mavi ◽  
S. Rath ◽  
Arun Shukla
Keyword(s):  
Quantum Confinement ◽  
Silicon Nanocrystals ◽  
Laser Wavelength ◽  
Interconnected Network ◽  
Substrate Type ◽  
Argon Ion Laser ◽  
Si Nanocrystals ◽  
Ion Laser ◽  
Laser Induced Etching ◽  
Argon Ion

Laser-induced etching of silicon is used to generate silicon nanocrystals. The pore structure depends on the substrate type and etching laser wavelength. Porous silicon (PS) samples prepared by Nd:YAG laser (1.16 eV) etching of n-type substrate showed a fairly uniform and highly interconnected network of nearly circular pores separated by thin columnar boundaries, while no circular pits were produced by argon- ion laser (2.41 eV) etching under similar conditions. The size and size distribution of the nanocrystals are investigated by Raman and photoluminescence spectroscopies and analyzed within the framework of quantum confinement models.

scholarly journals Depth-Resolved Microspectroscopy of Porous Silicon Multilayers

1999 ◽  
Vol 588 ◽  
Author(s):  
S. Manotas ◽  
F. Agulló-Rueda ◽  
J. D. Moreno ◽  
R. J. Martín-Palma ◽  
R. Guerrero-Lemus ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Quantum Confinement ◽  
Silicon Nanocrystals ◽  
Phonon Frequency ◽  
Lattice Mismatch ◽  
High Porosity ◽  
Phonon Confinement ◽  
Heating Effects ◽  
Average Size ◽  
Good Agreement

AbstractWe have measured micro-photoluminescence (PL) and micro-Raman spectra on the cross section of porous silicon multilayers to sample different layer depths. We find noticeable differences in the spectra of layers with different porosity, as expected from the quantum confinement of electrons and phonons in silicon nanocrystals with different average sizes. The PL emission band gets stronger, blue shifts, and narrows at the high porosity layers. The average size can be estimated from the shift. The Raman phonon band at 520 cm−1 weakens and broadens asymmetrically towards the low energy side. The line shape can be related quantitatively with the average size by the phonon confinement model. To get a good agreement with the model we add a band at around 480 cm−1, which has been attributed to amorphous silicon. We also have to leave as free parameters the bulk silicon phonon frequency and its line width, which depend on temperature and stress. We reduced laser power to eliminate heating effects. Then we use the change of frequency with depth to monitor the stress. At the interface with the substrate we find a compressive stress in excess of 10 kbar, which agrees with the reported lattice mismatch. Finally, average sizes are larger than those estimated from PL.

Photoluminescence of size-separated silicon nanocrystals: Confirmation of quantum confinement

2002 ◽  
Vol 80 (25) ◽  
pp. 4834-4836 ◽  
Author(s):  
G. Ledoux ◽  
J. Gong ◽  
F. Huisken ◽  
O. Guillois ◽  
C. Reynaud
Keyword(s):  
Quantum Confinement ◽  
Silicon Nanocrystals

Micro Raman Spectroscopy of Silicon Nanocrystals Produced by Picosecond Pulsed Laser Ablation

2002 ◽  
Vol 738 ◽  
Author(s):  
M. H. Wu ◽  
R. Mu ◽  
A. Ueda ◽  
D. O. Henderson ◽  
B. Vlahovic
Keyword(s):  
Laser Ablation ◽  
Raman Spectra ◽  
Silicon Nanocrystals ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Size Distributions ◽  
Laser Plume ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTPulsed laser ablation has been used to produce silicon nanocrystals. Variation of the laser fluence, backing gas type and pressure result in nanocrystals with controllable size distributions. Properties of nanocrystals produced with this method also depend on the distance of the nanocrystal from the center of the laser plume. Correlated atomic force microscopy and in-situ micro-Raman measurements confirm that particle size decreases as distance from the plume center increases. Silicon peaks in the micro raman spectra taken at increasing distance from plume center show considerable differences in both center energy and width. Confocal micro raman spectra from thicker (> 10 micron) samples show little variation with depth, in contrast with porous silicon samples.

Quantum confinement and recombination dynamics in silicon nanocrystals embedded in Si/SiO2 superlattices

2000 ◽  
Vol 87 (11) ◽  
pp. 8165-8173 ◽  
Author(s):  
Vincenzo Vinciguerra ◽  
Giorgia Franzò ◽  
Francesco Priolo ◽  
Fabio Iacona ◽  
Corrado Spinella
Keyword(s):  
Quantum Confinement ◽  
Silicon Nanocrystals ◽  
Recombination Dynamics

Quantum confinement regime in silicon nanocrystals

2009 ◽  
Vol 41 (4) ◽  
pp. 668-670 ◽  
Author(s):  
Julien Derr ◽  
Kerry Dunn ◽  
Daria Riabinina ◽  
François Martin ◽  
Mohamed Chaker ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Silicon Nanocrystals

Quantum-Confinement Effect in Silicon Nanocrystals during Their Dissolution in Model Biological Fluids

2021 ◽  
Vol 55 (1) ◽  
pp. 61-65
Author(s):  
M. B. Gongalsky ◽  
U. A. Tsurikova ◽  
K. A. Gonchar ◽  
G. Z. Gvindgiliiia ◽  
L. A. Osminkina
Keyword(s):  
Quantum Confinement ◽  
Silicon Nanocrystals ◽  
Biological Fluids ◽  
Quantum Confinement Effect ◽  
Confinement Effect
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