Memory and logic operations in self-powered multiferroic photodetectors

The in-sensor computing paradigm, which enables rapid signal processing with low energy consumption, pursues a frontier model to reduce data transmission and redundancy. The direct conversion of light signals into photocurrent is achieved in multiferroic photodetectors, which implement in-sensor computing. The millisecond response and detectivity of ∼1015 Jones enable pronounced performance in wavelengths 300–430 nm. By leveraging the plastic photocurrent/photoconductance, Bi4Ti3−xFexO12 multiferroic photodetectors exhibit memory/forgetting and logic functions (OR, AND, and NOT) under light and electric pulse stimulation, which is attributed to the coupling of magnetic photocurrent with the imprinting effect. The observations highlight the advantages of in-sensor memory and computing.