Abstract

The color imaging capacity of recently developed perovskite photodetectors (PDs) has not been fully explored. In this Letter, we fabricate a ${{\rm CH}_3}{{\rm NH}_3}{{\rm PbI}_3}$ (${{\rm MAPbI}_3}$) 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 ${{\rm TiO}_2}$ 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 ${\sim}{{10}^5}$ fold enhancement of the ON/OFF ratio. Since we obtained satisfactory color images, we believe that the ${{\rm MAPbI}_3}$ perovskite PD is an ideal photosensitive device for color imaging.

© 2020 Optical Society of America

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