(a) Plan-view and (b) cross-sectional SEM images of the partially coalesced GaN nanocolumns.
(a) Secondary electron image of the partially coalesced GaN layer, (b) plan-view integrated intensity CL map from the partially coalesced GaN nanocolumns layer, (c) mean CL spectrum from the mapped region.
The CL maps showing the distribution of peak intensity, center energy, and line width for the bandedge (a, b, and c, respectively) and DAP emission (d, e, and f, respectively).
The CL peak energy map of GaN NBE emission overlaid on the corresponding secondary electron image.
(a) SE image showing the mapped region in a box, (b) cross-sectional CL integrated intensity map, (c) mean spectrum from the cross-section CL map, (d) line spectrum corresponding to CL line scan analysis.
Comparison of the spectra and FWHM of averaged line spectra from the nanocolumn layer and the top partially coalesced layer.
(a) FWHM and (b) wavelength variation of the NBE emission as the electron beam scans from the nanocolumn layer to the top of the partially coalesced layer. The lines are guides to the eye.
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