期刊
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
卷 77, 期 -, 页码 42-53出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S205327332001548X
关键词
nanowires; Porod's law; facet truncation rods; small-angle X-ray scattering; SAXS; grazing-incidence small-angle X-ray scattering; GISAXS
资金
- Spanish programme Ramon y Cajal [RYC-2016-19509]
- European Social Fund
Small-angle X-ray scattering from GaN nanowires grown on Si(111) was measured and modeled using Monte Carlo simulation, indicating that scattering intensity at large wavevectors depends on the orientation of side facets and is reduced by surface roughness.
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) proportional to 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.
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