Physical reservoir computing system fully implemented using a single flash memory device via tailored decay pulse modulation

초록

With the rapid expansion of artificial intelligence (AI) applications, developing energy-efficient hardware capable of processing temporal data has become increasingly critical. In this work, we present a physical reservoir computing (RC) system fully implemented using a single TiN/Al<inf>2</inf>O<inf>3</inf>/Si<inf>3</inf>N<inf>4</inf>/SiO<inf>2</inf>/poly-Si (TANOS) flash memory device. Unlike prior approaches that rely on multiple or heterogeneous devices, our system uniquely realizes both the reservoir and readout functionalities within a single device platform. By applying a tailored decay pulse scheme, we induce short-term memory (STM)-like dynamics in a device traditionally known for long-term memory (LTM), enabling dynamic reservoir state evolution essential for temporal signal encoding. The TANOS device demonstrates excellent endurance (>105 cycles), low gate leakage (∼10.06 nA), and high device uniformity, supporting reliable and low-power operation, with the operation possessing the highest energy consumption (erase) consuming only 513.1 pJ per pulse at room temperature. When integrated into a CNN-based RC framework, the system achieves a high classification accuracy of 88.38 % on the Fashion MNIST dataset and maintains strong performance in a fully hardware-oriented MNIST simulation. These results highlight the potential of standard silicon memory technology for building compact, energy-efficient, and fully self-contained neuromorphic computing systems, paving the way for scalable and CMOS-compatible AI hardware using a single memory device. © 2025 Elsevier B.V., All rights reserved.

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