Ultrasensitive Perovskite Photodetector for Filter-Free Color Single-Pixel Imaging

摘要

Filter-free color imaging is the long-pursued solution for its simple structure,low cost, and high stability. However, a spectroscopic unit is still necessary forthe current Si-based imaging unit due to the intrinsic photoresponse propertiesof Si. Here, the authors demonstrate a filter-free color-resolved single-pixelimaging (SPI) by combining the working mechanism of computational ghostimaging and the response characteristic of perovskite. Benefitting from abroad linear dynamic range (106.5 dB) and a high detectivity (4.03 × 10~(14) Jones)of the fabricated ultrasensitive MAPbBr_3 microwire arrays (MWAs) photodetector,the light attenuation caused by an object can be effectively correlatedwith its color. The reconstructed images of both transmissive and reflectivecolor objects show a high wavelength resolution reaching 20 nm in the rangeof 400–540 nm, which is impossible to achieve by commercial silicon-photodiode-based ones. This work can open a new door for the image acquisition ofcolor-sensitive objects and also pave a way for the evolution of the next generationof detectors and cameras with low-dimensional perovskite materials.