Changes in the shapes of self-organized PbSe quantum dots during PbEuTe overgrowth investigated by anomalous X-ray diffraction

2006 ◽  
Vol 253 (1) ◽  
pp. 177-181 ◽  
Author(s):  
V. Holý ◽  
T.U. Schülli ◽  
R.T. Lechner ◽  
G. Springholz ◽  
G. Bauer
Keyword(s):  
Quantum Dots ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized

Lateral and vertical ordering in multilayered self-organized InGaAs quantum dots studied by high resolution x-ray diffraction

1997 ◽  
Vol 70 (8) ◽  
pp. 955-957 ◽  
Author(s):  
A. A. Darhuber ◽  
V. Holy ◽  
J. Stangl ◽  
G. Bauer ◽  
A. Krost ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized

High Resolution X-Ray Diffraction and Reflectivity Studies of Vertical and Lateral Ordering in Multiple Self-Organized InGaAs Quantum Dots

1997 ◽  
Vol 36 (Part 1, No. 6B) ◽  
pp. 4084-4087 ◽  
Author(s):  
Anton A. Darhuber ◽  
Vaclav Holy ◽  
Julian Stangl ◽  
Günther Bauer ◽  
Alois Krost ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized ◽  
Lateral Ordering

Determination of strain fields and composition of self-organized quantum dots using x-ray diffraction

2001 ◽  
Vol 63 (3) ◽  
Author(s):  
I. Kegel ◽  
T. H. Metzger ◽  
A. Lorke ◽  
J. Peisl ◽  
J. Stangl ◽  
...  
Keyword(s):  
Quantum Dots ◽  
X Ray Diffraction ◽  
Strain Fields ◽  
X Ray ◽  
Self Organized

Double crystal X-ray diffraction study of MBE self-organized InAs quantum dots

1998 ◽  
Vol 41 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Yutian Wang ◽  
Yan Zhuang ◽  
Wenquan Ma ◽  
Wei Wang ◽  
Xiaoping Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
Double Crystal ◽  
Inas Quantum Dots ◽  
X Ray ◽  
Self Organized

X-ray diffraction analysis of self-organized InAs quantum dots

1996 ◽  
Author(s):  
Yan Zhuang ◽  
Y.T. Wang ◽  
W.Q. Ma ◽  
W. Wang ◽  
X.P Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Inas Quantum Dots ◽  
X Ray ◽  
Title X ◽  
Self Organized

Lateral and Vertical Ordering of PbSe Self-Assembled Quantum Dots in PbSe/PbEuTe Superlattices

2000 ◽  
Vol 618 ◽  
Author(s):  
V. Holý ◽  
J. Stangl ◽  
G. Springholz ◽  
M. Pinczolits ◽  
G. Bauer
Keyword(s):  
Quantum Dots ◽  
Hexagonal Lattice ◽  
Grazing Incidence ◽  
Ideal Gas ◽  
X Ray Diffraction ◽  
Free Standing ◽  
X Ray ◽  
Self Organized ◽  
X Ray Scattering ◽  
Vertical Correlation

ABSTRACTThe shape and the positions of self-organized PbSe quantum dots embedded in PbEuTe are studied by means of grazing-incidence small angle x-ray scattering and x-ray diffraction. Using a detailed numerical analysis of the measured x-ray data, we have determined a truncated pyramidal shape of the free-standing dots. The type of the lateral dot ordering depends substantially on the period of the PbSe/PbEuTe superlattice. In the case of smaller periods, the lateral ordering of the dots obeys a short-range order model and we have determined the statistical properties of the dot arrangement. For intermediate spacer thicknesses the dots form a hexagonal lattice. For larger periods, the dots are completely uncorrelated and their distribution can be described as a two-dimensional ideal gas. From coplanar x-ray diffraction we have determined additionally the vertical correlation of the dot positions changes from a mere vertical correlation for small superlattice periods, to a distorted trigonal lattice for the intermediate periods. For the largest period, no vertical correlation of dot positions is observed.

scholarly journals Observation of ordered organic capping ligands on semiconducting quantum dots via powder X-ray diffraction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jason J. Calvin ◽  
Tierni M. Kaufman ◽  
Adam B. Sedlak ◽  
Michelle F. Crook ◽  
A. Paul Alivisatos
Keyword(s):  
Quantum Dots ◽  
Colloidal System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ligand Shell ◽  
Scattering Factor ◽  
Organic Capping ◽  
Capping Ligands ◽  
Key Techniques ◽  
Inorganic Structure

AbstractPowder X-ray diffraction is one of the key techniques used to characterize the inorganic structure of colloidal nanocrystals. The comparatively low scattering factor of nuclei of the organic capping ligands and their propensity to be disordered has led investigators to typically consider them effectively invisible to this technique. In this report, we demonstrate that a commonly observed powder X-ray diffraction peak around $$q=1.4{\AA}^{-1}$$ q = 1.4 Å − 1 observed in many small, colloidal quantum dots can be assigned to well-ordered aliphatic ligands bound to and capping the nanocrystals. This conclusion differs from a variety of explanations ascribed by previous sources, the majority of which propose an excess of organic material. Additionally, we demonstrate that the observed ligand peak is a sensitive probe of ligand shell ordering. Changes as a function of ligand length, geometry, and temperature can all be readily observed by X-ray diffraction and manipulated to achieve desired outcomes for the final colloidal system.

scholarly journals Coplanar and grazing incidence x-ray-diffraction investigation of self-organized SiGe quantum dot multilayers

1998 ◽  
Vol 58 (12) ◽  
pp. 7934-7943 ◽  
Author(s):  
V. Holý ◽  
A. A. Darhuber ◽  
J. Stangl ◽  
S. Zerlauth ◽  
F. Schäffler ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Grazing Incidence ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized ◽  
Sige Quantum Dot
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