Enhancing the photodetection performance of MAPbI3 perovskite photodetectors by a dual functional interfacial layer for color imaging

The color imaging capacity of recently developed perovskite photodetectors (PDs) has not been fully explored. In this Letter, we fabricate a C H 3 N H 3 P b I 3 ( M A P b I 3 ) PD as a color imaging sensor mainly due to its almost flat spectral response in a full visible light region. To enhance the photodetection performance, we introduce a dual functional interfacial T i O 2 layer by atomic layer deposition, reducing the dark current to 12 pA from 13 nA and improving the photocurrent to 1.87 µA from 20 nA, resulting in a ∼ 10 5 fold enhancement of the ON/OFF ratio. Since we obtained satisfactory color images, we believe that the M A P b I 3 perovskite PD is an ideal photosensitive device for color imaging.