Light‐Assisted Sub‐Coercive Ferroelectric Programming for Reconfigurable In‐Sensor Logic

ABSTRACT Reconfigurable optoelectronic logic devices are attractive for in‐sensor computing, yet their practical deployment is often hindered either by structurally complex heterostructures or by the limited reconfigurability of simple single‐material platforms. Here, we report light‐assisted sub‐coercive programming in ferroelectric Pb(Zr, Ti)O 3 (PZT) thin films and exploit this effect for monolithic in‐sensor logic. Ultraviolet (UV) illumination generates photocarriers that effectively screen the depolarization field, thereby lowering the barrier for domain reversal and enabling deterministic polarization switching at genuinely sub‐coercive voltages. This light‐assisted electrical programming produces robust, bidirectional, and non‐volatile modulation of the photocurrent in a simple two‐terminal Au/PZT/fluorine‐doped tin oxide (FTO) device. As a direct consequence, three fundamental Boolean logic operations, AND, OR, and NOT, are reconfigured within a single device, integrating optical sensing, memory, and logic processing without relying on complex material junctions. These results establish a practical route toward low‐voltage, reconfigurable ferroelectric optoelectronics based on a structurally simple and technologically mature oxide platform.