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Visualising highly localised luminescence in GaN/AlN heterostructures in nanowires

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Academic year: 2021

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Figure 1: Acquisition scheme for spectrum imaging. On the left, in the microscope (STEM) two kinds of detectors are used: a Dark Field Detector and a CCD camera attached at the exit of an
Figure 2: STEM-HAADF images of three different NWs from the same sample. (a) A NW with only a well-defined QDisc system
Figure 5: Spectra extracted from the spectrum image at different positions. (a) Parts of the GaN NW either covered with the AlN shell or not (the spectra are extracted from the regions marked with squares in Fig
Figure 6: Dependence of the CL signal intensity at λ=333 nm (a) (coming mostly from the 3 rd QDisc) and at λ=337 nm (b) (coming mostly from 4 th QDisc) on the electron probe position (see horizontal lines in Figure S2(b))
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