A Magnetostrictive‐actuated Bionic Piezo‐Phototronic Device for Dual‐Threshold Adaptive Vision System

Abstract A wide dynamic range perception capability of biological vision relies on its adaptive neural modulation mechanisms, whereas bionic optoelectronic devices require precise and multi‐threshold modulation of photocurrent to attain or even surpass the corresponding functionality. Here, bidirectional photocurrent modulation under a magnetic field is accomplished in a novel magnetostrictive‐actuated piezo‐phototronic heterojunction device (MAPP‐HJT), which incorporates Terfenol‐D as the substrate and integrates two orthogonally arranged heterostructures, each consisting of vertically stacked mica, α‐In 2 Se 3 flakes, and few‐layer WSe 2 . The meticulously fabricated MAPP‐HJT exhibits an outrageous photocurrent enhancement factor of 3180.7 under magneto‐induced tensile strain fields, whereas the photocurrent inhibition factor attains 1736.2 under magneto‐induced compressive strain fields. Based on these remarkable magneto‐bidirectional regulation characteristics and combined with a convolutional neural network (CNN), the established bionic dual‐threshold adaptive vision system not only improves high‐illumination images (with luminance at 300% of the reference image) recognition accuracy by 1.3 times but also enhances low‐illumination images (with luminance at 10% of the reference image) recognition accuracy by over 3.2 times. These findings promote the progress of piezo‐phototronics while further providing a new paradigm for the design of adaptive bionic vision devices.