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- ItemCritical aspects of substrate nanopatterning for the ordered growth of GaN nanocolumns(London : BioMed Central, 2011) Barbagini, Francesca; Bengoechea-Encabo, Ana; Albert, Steven; Martinez, Javier; Sanchez GarcĂa, Miguel Angel; Trampert, Achim; Calleja, EnriquePrecise and reproducible surface nanopatterning is the key for a successful ordered growth of GaN nanocolumns. In this work, we point out the main technological issues related to the patterning process, mainly surface roughness and cleaning, and mask adhesion to the substrate. We found that each of these factors, process-related, has a dramatic impact on the subsequent selective growth of the columns inside the patterned holes. We compare the performance of e-beam lithography, colloidal lithography, and focused ion beam in the fabrication of hole-patterned masks for ordered columnar growth. These results are applicable to the ordered growth of nanocolumns of different materials.
- ItemDelayed crystallization of ultrathin Gd2O3 layers on Si(111) observed by in situ X-ray diffraction(London : BioMed Central, 2012) Hanke, Michael; Kaganer, Vladimir M.; Bierwagen, Oliver; Niehle, Michael; Trampert, AchimWe studied the early stages of Gd2O3 epitaxy on Si(111) in real time by synchrotron-based, high-resolution X-ray diffraction and by reflection high-energy electron diffraction. A comparison between model calculations and the measured X-ray scattering, and the change of reflection high-energy electron diffraction patterns both indicate that the growth begins without forming a three-dimensional crystalline film. The cubic bixbyite structure of Gd2O3 appears only after a few monolayers of deposition.