Bias-Modulated Multicolor Discrimination Enabled by an Organic–Inorganic Hybrid Perovskite Photodetector with a p-i-n-i-p Configuration

摘要

Despite significant progress in color discrimination in various optoelectronicsystems, most conventional technologies equipped with dissipative opticalfilters still suffer from high incident light loss and costly manufacturing.Herein, it is demonstrated that a novel class of organic–inorganic hybridperovskite photodetectors based on a p-i-n-i-p structure can exhibit aswitchable spectral response caused by bias modulation. A singlephotodetector with a p-i-n-i-p structure in which a low-band n-i-p perovskitediode is vertically stacked on top of a high-band p-i-n perovskite diode allowsselective charge extraction from each perovskite diode by switching the biaspolarity, resulting in fine discrimination of monochromatic red (R), green (G),and blue (B) light. Furthermore, a combination of two p-i-n-i-p photodetectorsis successfully applied for identifying an arbitrary nonmonochromatic color(i.e., a mixed color in RGB space); thus, this approach can pave the way fordeveloping spatially efficient and optical filter-free imaging systems.