Size-Dependent Optical Properties of Si Nanocrystals Embedded in a Silica Matrix

2012 ◽  
Vol 12 (11) ◽  
pp. 8681-8685
Author(s):  
A.-S. Keita ◽  
A. En Naciri
Keyword(s):  
Optical Properties ◽  
Silica Matrix ◽  
Size Dependent ◽  
Si Nanocrystals

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.

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.

Synthesis and size control of Si nanocrystals by SiO/SiO2 superlattices and Er doping

2002 ◽  
Vol 737 ◽  
Author(s):  
J. Heitmann ◽  
D. Kovalev ◽  
M. Schmidt ◽  
L.X. Yi ◽  
R. Scholz ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crystal Size ◽  
Radiative Lifetime ◽  
Size Control ◽  
Luminescence Signal ◽  
Er Doping ◽  
Size Dependent ◽  
Transmission Electron ◽  
Si Nanocrystals ◽  
Ultrathin Layers

ABSTRACTThe synthesis of nc-Si by reactive evaporation of SiO and subsequent thermal induced phase separation is reported. The size control of nc-Si is realized by evaporation of SiO/SiO2 superlattices. By this method an independent control of crystal size and density is possible. The phase separation of SiO into SiO2 and nc-Si in the limit of ultrathin layers is investigated. Different steps of this phase separation are characterized by photoluminescence, infrared absorption and transmission electron microscopy measurements. The strong room temperature luminescence of nc-Si shows a strong blueshift of the photoluminescence signal from 850 to 750 nm with decreasing crystal size. Several size dependent properties of this luminescence signal, like decreasing radiative lifetime and increasing no-phonon transition properties with decreasing crystal size are in good agreement with the quantum confinement model. Er doping of the nc-Si shows an enhancement of the Er luminescence at 1.54 μm by a factor of 5000 compared to doped SiO2 layers. The decreasing transfer time for the nc-Si to Er transition with decreasing crystal size can be understood as additional proof of increasing recombination probability within the nc-Si for decreasing crystal size.

Structural and optical properties of Si nanocrystals embedded in SiO2/SiNx multilayers

2009 ◽  
Vol 41 (6) ◽  
pp. 994-997 ◽  
Author(s):  
F. Delachat ◽  
M. Carrada ◽  
G. Ferblantier ◽  
A. Slaoui ◽  
C. Bonafos ◽  
...  
Keyword(s):  
Optical Properties ◽  
Structural And Optical Properties ◽  
Si Nanocrystals

A Nanoscale Adventure with Silicon: Synthesis, Surface Chemistry, and other Surprises

2015 ◽  
Vol 242 ◽  
pp. 383-390
Author(s):  
Md Hosnay Mobarok ◽  
Tapas K. Purkait ◽  
Jonathan G.C. Veinot
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Chemistry ◽  
Research Group ◽  
Size Dependent ◽  
Earth Abundant ◽  
Potential Applications ◽  
Si Quantum Dots

The preparation and surface chemistry Si quantum dots (SiQDs) are currently an intense focus of research because of their size dependent optical properties and many potential applications. SiQDs offer several advantages over other quantum dots; Si is earth abundant, non-toxic and biocompatible. This account briefly highlights recent advancements made by our research group related to the synthesis, functionalization, surface dependent optical properties and applications of SiQDs.

Colloidal synthesis of uniform CuI nanoparticles and their size dependent optical properties

2013 ◽  
Vol 100 ◽  
pp. 166-169 ◽  
Author(s):  
Yongsheng Ma ◽  
Mu Gu ◽  
Shiming Huang ◽  
Xiaolin Liu ◽  
Bo Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Synthesis ◽  
Size Dependent
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