Fig. 1

Device structure and related characteristics. a Schematic of CCPD. b Cross-sectional SEM image of the photodetectors with a scale of 500 nm. c TEM image of CsPbBr₃ QDs with a scale of 20 nm, the inset is XRD spectrum of CsPbBr₃ QDs. d XRD spectrum of CH₃NH₃PbI_3−xCl_x perovskite film. e Optical absorption spectrum of CH₃NH₃PbI_3−xCl_x perovskite (olive line) and perovskite decorated with CsPbBr₃ QDs (origin line) on a glass substrate