Photoluminescence properties and size distribution in laser synthesized Si nanopowders for optoelectronic devices

Small‐angle neutron scattering (SANS) and transmission electron microscopy (TEM) have been used to investigate the correlation between photoluminescence properties and particle size distributions in laser synthesized Si nanopowders, of interest for application in optoelectronics. The Si nanoparticle...

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Bibliographic Details
Published in:Journal of applied crystallography 2003-06, Vol.36 (3-1), p.632-635
Main Authors: Botti, S., Coppola, R., May, R. P., Valli, M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanocrystals and nanoparticles
nanoparticle
Nanoscale materials and structures: fabrication and characterization
Neutron diffraction and scattering
Neutron scattering techniques (including small-angle scattering)
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
optoelectronic devices
Physics
small angle neutron scattering
Structure of solids and liquids
crystallography
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Summary:Small‐angle neutron scattering (SANS) and transmission electron microscopy (TEM) have been used to investigate the correlation between photoluminescence properties and particle size distributions in laser synthesized Si nanopowders, of interest for application in optoelectronics. The Si nanoparticle volume distributions obtained from the SANS data are in good agreement with the TEM histogram for particle diameters ranging between 30 and 200 Å approximately. Furthermore the SANS data confirm that, as it is known from photoemission spectra, in the case of highly luminescent powders a secondary distribution of particles ranging between 10 and 20 Å approximately (hardly visible by TEM) is present. Finally the SANS data analysis suggests that tiny inhomogeneities (5‐10 Å in diameter), possibly micropores which may have relevant consequences on material performance, are also present in all the investigated samples.
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S0021889803005041