Fig 1
From: Substrate-Free InGaN/GaN Nanowire Light-Emitting Diodes
The GaN NW core–shell structure. a Cross-sectional SEM image of the as-grown NWs with the average height of ~20 μm. b 45° tilted SEM image of the NW array. c Top view SEM image of the NWs. d Schematic of the nanowire internal structure