Optical Properties Of Si Nanocrystals Formed In Si02 By Ion Implantation

1998 ◽  
Vol 507 ◽  
Author(s):  
C. W. White ◽  
S. P. Withrow ◽  
A. Meldrum ◽  
J. D. Budai ◽  
D. M. Hembree ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Ion Implantation ◽  
Quantum Confinement ◽  
Dose Dependence ◽  
Interface States ◽  
High Dose ◽  
Size Dependent ◽  
Si Nanocrystals

ABSTRACTSi nanocrystals formed in SiO2 by high-dose ion implantation and annealing give rise to strong optical absorption and intense photoluminescence (PL). The dose dependence of optical absorption provides evidence for size-dependent quantum confinement in the Si nanocrystals. PL peak energies are nearly independent of dose suggesting that surface or interface states play an important role in PL. Estimates of absorption bandgaps in the nanocrystals are given.

Analysis of High Dose Implanted Silicon by High Depth Resolution Rbs and Spectroscopic Ellipsometry and TEM

1984 ◽  
Vol 35 ◽  
Author(s):  
T. Lohner ◽  
G. Mezey ◽  
M. Fried ◽  
L. GhiţA ◽  
C. Ghiţa ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ion Implantation ◽  
Spectroscopic Ellipsometry ◽  
Composite Structures ◽  
Depth Resolution ◽  
High Dose ◽  
Detailed Characterization ◽  
High Depth ◽  
Qualitative Picture

ABSTRACTOne of the applications of high dose ion implantation is to form surface alloys or compound layers. The detailed characterization of such composite structures is of great importance. This paper tries to answer the question: how can we outline, at least, a qualitative picture from the optical properties measured by ellipsometry of high dose Al and Sb implanted silicon. Attempts are done to separate the effect of implanted impurities from the dominant disorder contribution to the measured optical properties. As the ellipsometry does not provide information enough to decide the applicability of optical models therefore methods sensitive to the structure (channeling and TEM) were applied too.

Morphology and Size Dependent Optical Properties of CdS Nanostructures

2006 ◽  
Vol 6 (3) ◽  
pp. 771-776 ◽  
Author(s):  
Soumitra Kar ◽  
S. K. Panda ◽  
B. Satpati ◽  
P. V. Satyam ◽  
S. Chaudhuri
Keyword(s):  
Particle Size ◽  
Optical Properties ◽  
Aspect Ratio ◽  
Optical Absorption ◽  
Cds Nanoparticles ◽  
Solvothermal Process ◽  
Optical Absorption Spectra ◽  
Size Dependent ◽  
Cds Nanostructures ◽  
Size And Morphology

CdS nanoparticles with different sizes ranging from 2.5 nm to 300 nm and nanorods with aspect ratio ∼32 were synthesized by simple solvothermal process with a view to explore the effect of size and shape on the optical properties of these nanoforms. Solvent, temperature and the Cd source played important role in determining the morphologies and sizes of the nanocrystals. Comparative study of the optical properties of these nanoforms showed systematic changes in the optical absorption spectra with the reduction in particle size. Nanorods showed bulk like properties. Photoluminescence and Raman studies were carried out to explore the size and morphology dependent optical properties of the CdS nanoforms.

Size-dependent donor and acceptor states in codoped Si nanocrystals studied by scanning tunneling spectroscopy

Nanoscale ◽  
2017 ◽  
Vol 9 (45) ◽  
pp. 17884-17892 ◽  
Author(s):  
Or Ashkenazi ◽  
Doron Azulay ◽  
Isaac Balberg ◽  
Shinya Kano ◽  
Hiroshi Sugimoto ◽  
...  
Keyword(s):  
Optical Properties ◽  
Semiconductor Nanocrystals ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Electrical And Optical Properties ◽  
Size And Shape ◽  
Size Dependent ◽  
Si Nanocrystals ◽  
Donor And Acceptor

The electrical and optical properties of semiconductor nanocrystals (NCs) can be controlled, in addition to size and shape, by doping.

Synthesis and Optical Properties of MoS2 Nanoclusters

1996 ◽  
Vol 452 ◽  
Author(s):  
J. P. Wilcoxon ◽  
P. P. Newcomer ◽  
G. A. Samara
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Quantum Confinement ◽  
Cluster Size ◽  
Surface Recombination ◽  
Spin Orbit ◽  
Photoluminescence Spectra ◽  
Quantum Confinement Effects ◽  
Unit Cells ◽  
Order Of Magnitude

AbstractHighly crystalline nanoclusters of MoS2 were synthesized and their optical absorption and photoluminescence spectra were investigated. Key results include: (1) strong quantum confinement effects with decreasing size; (2) preservation of the quasiparticle (or excitonic) Nature of the optical response for clusters down to ∼2.5 nm in size which are only two unit cells thick; (3) demonstration that 3-D confinement produces energy shifts which are over an order of magnitude larger than those due to 1-D confinement; (4) observation of large increases in the spin-orbit splittings at the top of the valence band at the K and M points of the Brillouin zone with decreasing cluster size; and (5) observation of photoluminescence due to both direct and surface recombination.

scholarly journals Influence of nanocrystal size on optical properties of Si nanocrystals embedded in SiO2 synthesized by Si ion implantation

2007 ◽  
Vol 101 (10) ◽  
pp. 103525 ◽  
Author(s):  
L. Ding ◽  
T. P. Chen ◽  
Y. Liu ◽  
M. Yang ◽  
J. I. Wong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ion Implantation ◽  
Nanocrystal Size ◽  
Si Nanocrystals ◽  
Si Ion Implantation
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