Dresden 2017 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 4: X-Ray Imaging, Holography, Ptychography and Tomography

MI 4.6: Vortrag

Mittwoch, 22. März 2017, 11:15–11:30, MER 02

Core-shell-shell nanowires studied by coherent x-ray nano-beam — •Arman Davtyan¹, Vincent Favre-Nicolin², Ryan B. Lewis³, Hanno Küpers³, Lutz Gelhaar³, Dominik Kriegner⁴, Ali Al-Hassan¹, Otmar Loffeld¹, and Ullrich Pietsch¹ — ¹Faculty of Science and Engineering,University of Siegen,57068 Siegen,Germany — ²The European Synchrotron,71 Avenue des Martyrs,Grenoble,France — ³Paul-Drude-Institut für Festkörperelektronik,Hausvogteiplatz 5-7,D-10117 Berlin,Germany — ⁴4 Department of Condensed Matter Physics,Charles University, Ke Karlovu 5,121 16 Prague 2,Czech Republic

Core-shell-shell heterostructure nanowires (NWs) with 140nm GaAs core, 10nm In(0.10)Ga(0.90)As inner shell and 30nm GaAs outer shell have been investigated by combining coherent x-ray diffraction imaging (CXDI) and ptychograpy in the Bragg geometry. NWs were grown on a prepatterned substrate. Individual nanowires were measured at the ID01 beamline of the ESRF with coherent x-rays of 9keV energy and 150x200 nm full width half maximum (FWHM). 2D ptychography at GaAs (111) Bragg reflection was applied to investigate the nanowire along the growth axis. Ptychographic reconstruction shows the homogeneous structure of the wire along the growth axis. CXDI was applied to record the 3D reciprocal space maps around the symmetric GaAs (111) reflection at different heights along the NW growth axis.