Figure 7
From: The influence of AlN buffer layer on the growth of self-assembled GaN nanocolumns on graphene
RT micro-photoluminescence spectra of reference sample (HVPE-freestanding GaN), samples G1, G2 and G3. Inset shows the magnified spectra in the wavelength range from 440 to 570 nm, highlighting the presence of broad green and yellow emission band in the reference sample.
