Symposium: Neutron and X-Ray Studies of Advanced Materials

Metallurgical and Materials Transactions A

, Volume 41, Issue 5, pp 1191-1195

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

X-Ray Diffraction from Periodically Patterned GaAs Nanorods Grown onto GaAs[111]B

  • Anton DavydokAffiliated withSolid State Physics, Siegen University
  • , Andreas BiermannsAffiliated withSolid State Physics, Siegen University
  • , Ullrich PietschAffiliated withSolid State Physics, Siegen University Email author 
  • , Jörg GrenzerAffiliated withFZ-Dresden Rossendorf
  • , Hendrik PaetzeltAffiliated withIon Beam Technology Department, Leibniz Institute for Surface Modification
  • , Volker GottschalchAffiliated withSolid State Chemistry, University of Leipzig


We present a high-resolution X-ray diffraction pattern of periodic GaAs nanorod (NR) ensembles and individual GaAs NRs grown catalyst-free throughout a prepatterned amorphous SiN x mask onto GaAs[111]B surfaces. The experiments were performed at a home laboratory using synchrotron radiation in combination with a micron-sized beam prepared by compound refractive lenses. The structural properties were probed by measuring RSMs (q x , q z ) in the vicinity of GaAs(111) and (222) reflections. Besides the GaAs substrate peak, we found a second peak referring to NRs with lattice mismatch of 0.23 pct with respect to the substrate, probably caused by structural defects. The lateral periodicity of NRs was probed by q x scans, and the NR height obtained from the width of the diffraction curve along q z . Grazing-incidence in-plane diffraction revealed the appearance of small crystallites of cubic γ-Si3N4 caused by recrystallization of SiN x during NR growth. Whereas measurements at the home diffractometer provided average structure parameters, the micron-sized X-ray beam experiment was used to probe the parameters at individual NRs.