TY  - JOUR
A1  - Kaganer, Vladimir M.
A1  - Konovalov, Oleg V.
A1  - Fernández-Garrido, Sergio
T1  - Small‐angle X‐ray scattering from GaN nanowires on Si(111): facet truncation rods, facet roughness and Porod's law
Y1  - 2020-12-24
VL  - 77
IS  - 1
SP  - 42
EP  - 53
JF  - Acta Crystallographica Section A
DO  - 10.1107/S205327332001548X
DO  - 10.23689/fidgeo-4127
PB  - International Union of Crystallography
N2  - Small‐angle X‐ray scattering from GaN nanowires grown on Si(111) is measured in the grazing‐incidence geometry and modelled by means of a Monte Carlo simulation that takes into account the orientational distribution of the faceted nanowires and the roughness of their side facets. It is found that the scattering intensity at large wavevectors does not follow Porod's law I(q) ∝ q−4. The intensity depends on the orientation of the side facets with respect to the incident X‐ray beam. It is maximum when the scattering vector is directed along a facet normal, reminiscent of surface truncation rod scattering. At large wavevectors q, the scattering intensity is reduced by surface roughness. A root‐mean‐square roughness of 0.9 nm, which is the height of just 3–4 atomic steps per micrometre‐long facet, already gives rise to a strong intensity reduction.
N2  - The intensity of small‐angle X‐ray scattering from GaN nanowires on Si(111) depends on the orientation of the side facets with respect to the incident beam. This reminiscence of truncation rod scattering gives rise to a deviation from Porod's law. A roughness of just 3–4 atomic steps per micrometre‐long side facet notably changes the intensity curves. image
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8467
ER  -