Extended Data Fig. 1: Bandgap determination.
From: Solar-to-hydrogen efficiency of more than 9% in photocatalytic water splitting
SEM-CL images of InGaN/GaN nanowires. The high-energy electrons from the scanning electron microscope were used to photo-excite photocatalyst to produce photogenerated electrons and holes. The recombination of photogenerated electrons and holes leads to the cathodoluminescence phenomenon, which could be used to estimate the bandgap of the photocatalyst. A bandwidth of 5 nm was used to capture these monochromatic CL images. The luminescence bands at 445–545 nm revealed the visible-light response of InGaN/GaN nanowires.
