Bioinspired Bimodal Artificial Afferent Nerve Based on AgBiS2 QD/IGZO Heterojunction Optoelectronic Synaptic Transistor for Visuo-Tactile Fusion Perception

Reliable perception in complex and dynamically degraded environments remains a central challenge for both biological nervous systems and next-generation embodied intelligent systems. Biological organisms mitigate uncertainty via complementary bimodal perception, where various sensory modalities jointly sustain adaptive behaviors. Inspired by the star-nosed mole, we report an artificial visuo-tactile afferent nerve based on an AgBiS 2 quantum dot (QD)/IGZO heterojunction optoelectronic synaptic transistor. The artificial nerve supports sensory acquisition, neural-like signal encoding, synaptic modulation, and adaptive actuation within a unified neuromorphic framework. Benefiting from interfacial carrier separation and persistent photoinduced charge dynamics, this synaptic transistor exhibits reconfigurable synaptic plasticity with intrinsically coupled bimodal synaptic modulation. External visuo-tactile stimuli are first transformed into unified neuromorphic responses and subsequently mapped to threshold-governed robotic behaviors, including directional motion, turning, and grasping. Device-informed results demonstrate that device-enabled bimodal cooperation enhances recognition robustness under degraded perceptual conditions. This work establishes a compact, physically grounded framework integrating bimodal perception and adaptive intelligence, with potential implications for next-generation bioinspired neuromorphic systems.