| MEDUŇA, Mojmír, Ondřej CAHA, Emanuil CHOUMAS, Franco BRESSAN and Hans VON KÄNEL. X-ray rocking curve imaging on large arrays of extremely tall SiGe microcrystals epitaxial on Si. Journal of Applied Crystallography. International Union of Crystallography, 2021, vol. 54, August, p. 1071-1080. ISSN 0021-8898. Available from: https://dx.doi.org/10.1107/S1600576721004969. |
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@article{1794560,
author = {Meduňa, Mojmír and Caha, Ondřej and Choumas, Emanuil and Bressan, Franco and von Känel, Hans},
article_number = {August},
doi = {http://dx.doi.org/10.1107/S1600576721004969},
keywords = {rocking curve imaging; patterned Si substrates; Ge microcrystals; X-ray diffraction; thermal strain relaxation},
language = {eng},
issn = {0021-8898},
journal = {Journal of Applied Crystallography},
title = {X-ray rocking curve imaging on large arrays of extremely tall SiGe microcrystals epitaxial on Si},
url = {https://doi.org/10.1107/S1600576721004969},
volume = {54},
year = {2021}
}
TY - JOUR
ID - 1794560
AU - Meduňa, Mojmír - Caha, Ondřej - Choumas, Emanuil - Bressan, Franco - von Känel, Hans
PY - 2021
TI - X-ray rocking curve imaging on large arrays of extremely tall SiGe microcrystals epitaxial on Si
JF - Journal of Applied Crystallography
VL - 54
IS - August
SP - 1071-1080
EP - 1071-1080
PB - International Union of Crystallography
SN - 00218898
KW - rocking curve imaging
KW - patterned Si substrates
KW - Ge microcrystals
KW - X-ray diffraction
KW - thermal strain relaxation
UR - https://doi.org/10.1107/S1600576721004969
N2 - This work investigates layers of densely spaced SiGe microcrystals epitaxially formed on patterned Si and grown up to extreme heights of 40 and 100 mm using the rocking curve imaging technique with standard laboratory equipment and a 2D X-ray pixel detector. As the crystalline tilt varied both within the epitaxial SiGe layers and inside the individual microcrystals, it was possible to obtain real-space 2D maps of the local lattice bending and distortion across the complete SiGe surface. These X-ray maps, showing the variation of crystalline quality along the sample surface, were compared with optical and scanning electron microscopy images. Knowing the distribution of the X-ray diffraction peak intensity, peak position and peak width immediately yields the crystal lattice bending locally present in the samples as a result of the thermal processes arising during the growth. The results found here by a macroscopic-scale imaging technique reveal that the array of large microcrystals, which tend to fuse at a certain height, forms domains limited by cracks during cooling after the growth. The domains are characterized by uniform lattice bending and their boundaries are observed as higher distortion of the crystal structure. The effect of concave thermal lattice bending inside the microcrystal array is in excellent agreement with the results previously presented on a microscopic scale using scanning nanodiffraction.
ER -
MEDUŇA, Mojmír, Ondřej CAHA, Emanuil CHOUMAS, Franco BRESSAN and Hans VON KÄNEL. X-ray rocking curve imaging on large arrays of extremely tall SiGe microcrystals epitaxial on Si. \textit{Journal of Applied Crystallography}. International Union of Crystallography, 2021, vol.~54, August, p.~1071-1080. ISSN~0021-8898. Available from: https://dx.doi.org/10.1107/S1600576721004969.
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