Integration of H 2 V 3 O 8 nanowires and a GaN thin film for self-powered UV photodetectors.

H 2 V 3 O 8 /GaN n-n heterojunction ultraviolet photodetectors are fabricated via a facile dip-coating method. The Schottky junction between the GaN and H 2 V 3 O 8 builds a built-in electric field to achieve the self-powered phenomenon. The photodetector presents a high photocurrent (0.23 μA) and a fast response speed (less than 0.3 s) at 0 V bias and under 365 nm light illumination (24.50 mW cm -2 ). Furthermore, the photocurrent increases steadily as the light intensity increases from 0.53 to 24.50 mW cm -2 . The H 2 V 3 O 8 /GaN heterojunction holds great potential to realize high-performance hybrid PDs.