Diffuse x-ray scattering from statistically inhomogeneous
distributions of threading dislocations beyond the ergodic
hypothesis

J 2008

Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis

HOLÝ, Václav, T. BAUMBACH, D. LÜBBERT, L. HELFEN, M. ELLYAN et. al.

Basic information

Original name

Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis

Name in Czech

Difúzní rtg rozptyl na statisticky nehomogenním rozložení dislokací

Authors

HOLÝ, Václav (203 Czech Republic), T. BAUMBACH (276 Germany), D. LÜBBERT (276 Germany), L. HELFEN (276 Germany), M. ELLYAN (275 Palestine, State of), Petr MIKULÍK (203 Czech Republic, guarantor), S. KELLER (840 United States of America), S.P. DENBAARS (840 United States of America) and J. SPECK (840 United States of America)

Edition

Physical Review B, USA, The American Physical Society, 2008, 1098-0121

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 3.322

RIV identification code

RIV/00216224:14310/08:00025951

Organization unit

Faculty of Science

UT WoS

000254542500034

Keywords in English

X-ray diffraction; X-ray topography; Microdiffraction; Rocking curve imaging; Dislocations; GaN

Abstract

ORIG CZ

V originále

Diffuse x-ray scattering from threading dislocations in epitaxial structures is simulated numerically by a Monte Carlo method. The method allows one to simulate diffraction curves for dislocation types, where macroscopic approaches fail. That includes dislocation types for which analytical ensemble averaging is not feasible as well as microdiffraction curves from small sample volumes. In the latter case, the degree of statistic fluctuation of characteristic features is determined. The Monte Carlo method makes it possible to correlate quantitatively the widths of the microdiffraction curves to the densities of various dislocation types. The potential of the method has been demonstrated by a quantitative estimation of the density distribution of edge and screw threading dislocations in laterally overgrown epitaxial GaN structures, which is investigated by a full-field microdiffraction imaging technique. Measuring the asymptotic behavior of the microdiffraction curves allows one to conclude on the prevailing type of threading dislocations.

In Czech

Metodou Monte-Carlo jsme simuloval difúzni rozptyl rtg záření na dislokacích v epitaxních vrstvách. Tato metoda umožňuje simulovat difrakční křivky i pro taková uspořádání dislokací, kde makroskopické přístupy nelze použít, např. v mikrodifrakci na malých objemech vzorků. Díky metodě Monte-Carlo můžeme přiřadit šířky mikrodifrakčních křivek hustotě jednotlivých typů dislokací. Tento postup jsme aplikovali na určení hustoty hranových a šroubových dislokací v přerostlých vrstvách GaN.

Links

MSM0021622410, plan (intention)

Name: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur

Investor: Ministry of Education, Youth and Sports of the CR, Physical and chemical properties of advanced materials and structures

Citovat

HOLÝ, Václav, T. BAUMBACH, D. LÜBBERT, L. HELFEN, M. ELLYAN, Petr MIKULÍK, S. KELLER, S.P. DENBAARS and J. SPECK. Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis. Physical Review B. USA: The American Physical Society, 2008, vol. 77, No 1, p. 094102-94110. ISSN 1098-0121.

@article{766892,
   author = {Holý, Václav and Baumbach, T. and Lübbert, D. and Helfen, L. and Ellyan, M. and Mikulík, Petr and Keller, S. and DenBaars, S.P. and Speck, J.},
   article_location = {USA},
   article_number = {1},
   keywords = {X-ray diffraction; X-ray topography; Microdiffraction; Rocking curve imaging; Dislocations; GaN},
   language = {eng},
   issn = {1098-0121},
   journal = {Physical Review B},
   title = {Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis},
   url = {http://www.sci.muni.cz/~mikulik/Publications.html#HolyBaumbachLubbert-PRB-2008},
   volume = {77},
   year = {2008}
}

TY  - JOUR
ID  - 766892
AU  - Holý, Václav - Baumbach, T. - Lübbert, D. - Helfen, L. - Ellyan, M. - Mikulík, Petr - Keller, S. - DenBaars, S.P. - Speck, J.
PY  - 2008
TI  - Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis
JF  - Physical Review B
VL  - 77
IS  - 1
SP  - 094102
EP  - 094102
PB  - The American Physical Society
SN  - 10980121
KW  - X-ray diffraction
KW  - X-ray topography
KW  - Microdiffraction
KW  - Rocking curve imaging
KW  - Dislocations
KW  - GaN
UR  - http://www.sci.muni.cz/~mikulik/Publications.html#HolyBaumbachLubbert-PRB-2008
N2  - Diffuse x-ray scattering from threading dislocations in epitaxial structures is simulated numerically by a Monte Carlo method. The method allows one to simulate diffraction curves for dislocation types, where macroscopic approaches fail. That includes dislocation types for which analytical ensemble averaging is not feasible as well as microdiffraction curves from small sample volumes. In the latter case, the degree of statistic fluctuation of characteristic features is determined. The Monte Carlo method makes it possible to correlate quantitatively the widths of the microdiffraction curves to the densities of various dislocation types. The potential of the method has been demonstrated by a quantitative estimation of the density distribution of edge and screw threading dislocations in laterally overgrown epitaxial GaN structures, which is investigated by a full-field microdiffraction imaging technique. Measuring the asymptotic behavior of the microdiffraction curves allows one to conclude on the prevailing type of threading dislocations.
ER  -

HOLÝ, Václav, T. BAUMBACH, D. LÜBBERT, L. HELFEN, M. ELLYAN, Petr MIKULÍK, S. KELLER, S.P. DENBAARS and J. SPECK. Diffuse x-ray scattering from statistically inhomogeneous distributions of threading dislocations beyond the ergodic hypothesis. \textit{Physical Review B}. USA: The American Physical Society, 2008, vol.~77, No~1, p.~094102-94110. ISSN~1098-0121.

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