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Comparison of spot mode CL spectra from a pure semipolar (full line) and a pure nonpolar (dashed line) crystallite, exclusively showing excitonic or BSF luminescence, respectively.
SEM images of the sample surface of the nonpolar growth region (a) and the semipolar growth region (b). (c) and (d) depict lateral mappings of the local CL peak wavelength for the different regions, visualizing the contrary luminescence character of the two sample positions (blue contrast: dominant emission, green contrast: dominant BSF emission). (e) and (f) show CO maps (perpendicular to ) for the same sample areas, showing the microscopic local crystallographic orientations (green contrast: nonpolar , orange contrast: semipolar ).
(a) Integrated CL spectrum (continuous line, left scale) and histogram of the peak wavelength (black area, right scale) of the mainly nonpolar growth region. (b) Histogram of the crystallographic orientation in the same mainly nonpolar region. (c) Integral CL spectrum and peak wavelength histogram of the mainly semipolar growth region. (d) Histogram of the crystallographic orientation in the mainly semipolar region from the same area.
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