Reconfigurable in-Sensor Image Enhancement Based on Tunable Band Alignment of In ₂ Se ₃ /PdSe ₂ Heterojunction

In-sensor computing has emerged as a promising paradigm to overcome power consumption and latency bottlenecks in vision systems. Here, we demonstrate a reconfigurable in-sensor image enhancement strategy based on an In₂Se₃/PdSe₂ ferroelectric heterojunction. The photodetector exhibits a broadband spectral response (400-1550 nm) and a high external quantum efficiency exceeding 10⁴%. By synergistically leveraging electrostatic and ferroelectric fields to tune the band alignment, we achieve programmable carrier collection efficiency, leading to a gate-tunable nonlinear photocurrent response. This hardware-level nonlinearity enables dual imaging modes for adaptive imaging: a low-light signal amplification mode to boost brightness and an overexposure recovery mode to compress contrast. By implementing a programmable photoresponse into a single photodetector, our approach bypasses redundant data transmission, providing a compact and energy-efficient solution for intelligent vision systems.