Figure 1: Bird’s-eye view NBE/Visible CL imaging of ZnO free-standing nanorods. | Nature Communications

Figure 1: Bird’s-eye view NBE/Visible CL imaging of ZnO free-standing nanorods.

From: Arbitrary cross-section SEM-cathodoluminescence imaging of growth sectors and local carrier concentrations within micro-sampled semiconductor nanorods

Figure 1

SEM and monochromatic (NBE/Visible) CL images of ZnO free-standing nanorod arrays, probed by 3.0 keV e-beam. Each nanorod is homoepitaxially grown from individual growth window with a variety of diameter: (a) small diameter growth windows (Dw=100 nm) and (b) large diameter growth windows (Dw=500 nm). Nanorods misorientation in Dw=100 nm array takes place during the SEM observation due to electrical charge-up. A bright shadow behind each nanorod array in NBE CL image are signal from ZnO substrate, which is excited due to PMMA thinning by the concentrated e-beam dose. (c) Spot-CL spectroscopy at positions 1–8 in b, probed by 4.5 keV e-beam. Spectral bands for NBE/Visible CL imaging are highlighted with transparent grey zones. (d) A schematic of ZnO free-standing nanorod. Local NBE CL emission efficiency within the nanorod is illustrated by grey scale. The specimen is tilted by 45 degree from ZnO (0001) plane normal. All horizontal and vertical scale bars indicate lengths of 0.5 μm and 1.0 μm, respectively.

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