Si nanocrystals embedded in SiO{sub 2}: Optical studies in the vacuum ultraviolet range

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.83.045308· OSTI ID:21538068

Pankratov, V ^[1]; Osinniy, V ^[2]; Kotlov, A ^[3]; Nylandsted Larsen, A; Bech Nielsen, B ^[1]

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1. Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Ny Munkegade, Bld. 1521, DK-8000 C Aarhus (Denmark)
2. Department of Physics and Astronomy, Aarhus University, Ny Munkegade, Bld. 1520, DK-8000 C Aarhus (Denmark)
3. HASYLAB at DESY, Notkestrasse 85, D-22607 Hamburg (Germany)

Photoluminescence excitation and transmission spectra of Si nanocrystals of different diameters embedded in a SiO{sub 2} matrix have been investigated in the broad visible-vacuum ultraviolet spectral range using synchrotron radiation. The dependence of the photoluminescence excitation spectra on the nanocrystals size was experimentally established. It is shown that the photoluminescence excitation and absorption spectra are significantly blueshifted with decreasing Si nanocrystal size. A detailed comparison of photoluminescence excitation and absorption spectra with data from theoretical modeling has been done. It is demonstrated that the experimentally determined blueshift of the photoluminescence excitation and absorption spectra is larger than the theoretical predictions. The influence of point defects in the SiO{sub 2} matrix on the optical and luminescence properties of the embedded Si nanocrystals is discussed. Moreover, it is demonstrated that no energy transfer takes place between the SiO{sub 2} and Si nanocrystals when the excitation energy is higher than the band-to-band transition energy in SiO{sub 2}.

• OSTI ID: 21538068
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 4 Vol. 83; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTRA
BREMSSTRAHLUNG
CHALCOGENIDES
COMPARATIVE EVALUATIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EVALUATION
EXCITATION
LUMINESCENCE
NANOSTRUCTURES
OXIDES
OXYGEN COMPOUNDS
PHOTOLUMINESCENCE
PHOTON EMISSION
POINT DEFECTS
RADIATIONS
SILICON COMPOUNDS
SILICON OXIDES
SIMULATION
SPECTRA
SYNCHROTRON RADIATION
TRANSMISSION
ULTRAVIOLET RADIATION