Simultaneous high-resolution scanning Bragg contrast and ptychographic imaging of a single solar cell nanowire

Wallentin, J.; Wilke, R.N.; Osterhoff, M.; Salditt, T.

doi:10.1107/S1600576715017975

Figure 6
High-resolution scanning Bragg diffraction microscopy of the left (lower) half of the nanowire. (a) Rocking curve of θ_z, around the z axis, from the highest-intensity region near the base of the nanowire. The FWHM is 0.14°. (b) Sum of the intensity in the Bragg peak ROI of all angles. (c), (d) Images of q₂ and |q|, respectively. Each SBM scan was first shifted in order to compensate for real-space movement. The boxes in (b)–(d) indicate the position of the nanowire, as evaluated from the small-angle scattering. Scale bars are 0.5 µm, step size 50 nm. The position of the Bragg peak can be measured and analyzed also outside the boxed region, since the focused X-ray beam has intensity outside of the focus (see Fig. 4

a). (e) The rotation around q₁, calculated as β = −q₂/q₃ and averaged across the nanowire, versus a real-space coordinate, s, along the nanowire axis (parallel with q₃). The red line shows a linear fit with slope dβ/ds = −1.78 mrad µm⁻¹. (f) Exaggerated sketch of how the nanowire bends in the plane of the membrane, as seen along the beam (compare with Fig. 2

c).

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 48| Part 6| December 2015| Pages 1818-1826

doi:10.1107/S1600576715017975

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