A Lamellarly Controlled Molecular-Redox-Driven Memristor for Pruned Spiking Neuromorphic Computing.

Abstract

The low-power ionic-type memristor and brain-inspired neuromorphic device offer significant potential in breaking the power consumption wall. However, the precise control of uniform metallic conductive filament (CF) at both intra- and inter-molecular levels rather than random migration raises a pressing challenge. Here, we first report a symmetrical dual-core naphthalene diimide (bis-NDI) molecular material featuring multi-active and lamellarly ordered redox sites, which actuates reconfigurable analog-to-digital (A-t-D) memristive operations via the controllable manipulation of CF growth at the molecular scale. The bis-NDI-based memristor exhibits highly efficient analog synaptic behaviors, demonstrating an ultralow-power consumption of 90 aJ µm^-2. By effectively re-organizing lamellar redox sites, the device dynamically implements A-t-D transition with an operating voltage of 0.5 V (lower than most reported organic memristors) and ultrahigh yield of 98%. Relying on the bis-NDI induced A-t-D dynamic plasticity, a novel feedback mechanism of pruning algorithm is subtly devised for granular error analysis and voltage adjustment validation in spiking neural networks (SNNs) computing. The co-design of material-algorithm can effectively reduce the number of connected neurons (max reduced proportion = 92%), thereby achieving ultralow systemic energy consumption while maintaining exalted recognition rates (>90%). This work paves the material-algorithm cooperation way to realize ultralow-power neuromorphic devices and highly-efficient spiking computing.