Figure 3
From: Exciton emission of quasi-2D InGaN in GaN matrix grown by molecular beam epitaxy

(a) SEM image of the investigated sample surface. The cyan-blue arrows mark some In-rich droplets. The integral intensity CL image (b) reveals reduced intensity at the droplet positions. (c) distribution of the CL peak wavelength and corresponding monochromatic CL images in the spectral region of (d) GaN matrix and (e) quasi-2D InGaN layer. The monochromatic images are scaled to their individual minima and maxima intensities. (f) CL wavelength image of the InGaN luminescence contribution, exclusively. (g) spatially integrated CL spectrum of the area shown in SEM image (a) as well as the histogram of the wavelength image shown in (c).