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Charge-Trap Memory with Engineered Temporal Dynamics for Physically Integrated Reservoir Computing
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DOI：10.1002/smsc.202500356.png)
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Abstract
En 中文
2D material (2DM)-based reservoir computing (RC) systems combine the advantages of low-power hardware implementation with lightweight neural network architectures capable of processing complex temporal patterns through minimal training overhead, positioning them as ideal platforms for edge artificial intelligence (AI) applications. Here, a homogeneous RC system via defect engineering in PdSe2 charge-trap memory (CTM) by ultrafast photoexcitation is demonstrated, which directly generates PdSe2-xOx nanodefects, converting volatile states (approximate to 0% retention) into nonvolatile states (approximate to 80% retention) by introducing electron-depleting defects and scattering centers in PdSe2 channel. This engineering extends relaxation time constants from 15.6 s to 99.4 s and enables multilevel memory (>2(6) levels) with prolonged retention (>2000 s). Leveraging dual nonlinear/stable operational modes, the physically integrated RC system achieves 91.7% (MNIST) and 93.3% (spoken digits) classification accuracy. Notably, it pioneers electrocardiogram arrhythmia detection (N, L, R, A, and V classes) with 92.3% accuracy, surpassing existing in-memory computing approaches. By establishing a defect engineering paradigm for material-intrinsic neuromorphic devices, this work advances energy-efficient AI hardware for biomedical diagnostics and edge computing applications.
Keywords:
charge-trap memory
defect engineering
palladium diselenide
reservoir computing
ultrafast photoexcitation
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