High performance self-powered CuZnS/GaN UV photodetectors with ultrahigh on/off ratio (3 × 108)

P-CuZnS/n-GaN UV photodetector is prepared by a simple chemical bath deposition, showing excellent self-powered properties, including ultrahigh on/off ratio (3 × 10⁸), fast response speed (0.14/40 ms) and large detectivity of 3 × 10¹³ Jones.