Fig. 4From: Solution Processed Trilayer Structure for High-Performance Perovskite PhotodetectorThe UPS (ultraviolet photoelectron spectra) of a TiO2 film. b Ethanolamine film. c MAPbBr3 film. d Energy band diagram. I–V characteristics of photodetector devices at optimal ratio (1:1): e under dark, f under the light with intensity of 0.50 mW cm−2. g I–V characteristics of trilayer photodetector at different ratios of perovskiteBack to article page