The Conditions of Formation of the Uniform-Sized Quantum Dots in the Field of an Ultrasonic Wave

2019 ◽  
Vol 57 ◽  
pp. 40-50 ◽  
Author(s):  
Roman Peleshchak ◽  
Oleh Kuzyk ◽  
Olesya Dan'kiv

The non-linear diffusion-deformation theory of self-organization of nanoclusters of dot defects in semiconductor exposed to ultrasound treatment that considers the interaction of defects among themselves and with atoms of a matrix via the elastic field created by dot defects and an acoustic wave is developed. Within this theory the influence of ultrasound on the conditions of formation of spherical nanoclusters and their radius is investigated. The nanocluster size depending on average concentration of defects and amplitude of an acoustic wave is determined. It is established that ultrasonic treatment of the semiconductor in the process of formation of an ensemble of nanoclusters leads to reduction of dispersion of their sizes. In the framework of this model, a possibility of the ultrasound-stimulated the size dispersion reduction of strained InAs/GaAs quantum dots doped with an isovalent impurity are analyzed.

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1274
Author(s):  
Grigor A. Mantashian ◽  
Paytsar A. Mantashyan ◽  
Hayk A. Sarkisyan ◽  
Eduard M. Kazaryan ◽  
Gabriel Bester ◽  
...  

By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots ensemble. The interband optical absorption and photoluminescence spectra have been revealed for CdSe/CdS quantum dots, taking into account the size dispersion of the ensemble. Numerical calculation of the differential cross section has been presented for the exciton-related Stokes–Raman scattering in CdSe/CdS quantum dots ensemble with different mean sizes.


2005 ◽  
Vol 274 (3-4) ◽  
pp. 387-393 ◽  
Author(s):  
Akihiro Matsuse ◽  
Nicolas Grandjean ◽  
Benjamin Damilano ◽  
Jean Massies

1999 ◽  
Vol 201-202 ◽  
pp. 1161-1163 ◽  
Author(s):  
Qiandong Zhuang ◽  
Hanxuan Li ◽  
Liang Pan ◽  
Jinmin Li ◽  
Meiying Kong ◽  
...  

2007 ◽  
Vol 31 ◽  
pp. 161-163 ◽  
Author(s):  
A. Verma ◽  
P.K. Bhatnagar ◽  
P.C. Mathur ◽  
S. Nagpal ◽  
P.K. Pandey ◽  
...  

Quantum Dots (QDs) of CdSxSe1-x embedded in borosilicate glass matrix (BGM) have been grown using colored glass filter (RG695). Double-Step (DS) annealing method was adopted in which nucleation is achieved at a lower temperature (475°C) without any crystallization. To obtain crystallization on these nucleation centers, the annealing temperature is raised to 575°C at which the nucleation rate is negligible. QDs of various average radii and volume fractions are grown by varying the annealing duration from 3 to 11hrs. QDs corresponding to higher annealing duration are found to have low size dispersion (SD) and high volume fraction but weak quantum confinement, while, the QDs corresponding to lower annealing durations have high quantum confinement due to their much lower radii as compare to Bohr exciton radius, their SD is high and volume fraction low. For nonlinear optical applications the SD must be low and volume fraction should be high. Attempt has been made to optimize the two parameters. Further it has been concluded that there is no contribution of the band edge recombination to the PL and the origin of the PL is due to shallow traps existing in the volume of the QDs. Studies of absorption and PL have also been made on the samples aged for 18, 24 and 36 months. It is found that the effect of aging is to increase the absorption coefficient, reduce the shallow trap centers and reduce the SD.


2018 ◽  
Vol 49 (1) ◽  
pp. 1952-1955
Author(s):  
Kaiyu Yang ◽  
Fushan Li ◽  
Peimin Lu ◽  
Yang Liu ◽  
Hailong Hu ◽  
...  

2003 ◽  
Vol 68 (5) ◽  
Author(s):  
A. A. Golovin ◽  
S. H. Davis ◽  
P. W. Voorhees

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