A hippocampus-inspired illumination time-resolved device for neural coding

Abstract

Artificial photonic synapses have set off a new upsurge for mimicking a series of neural activities in recent years. In particular, the investigation of learning and memory behaviors with pressure or emotion and corresponding mechanisms is currently the focus of more attention. Herein, a hippocampus-inspired device based on MoS2 for illumination time encoding is fabricated, in which the encryption technology is employed for data security. In addition, the pressure-induced memory behaviors with full memory function (memory trace) over time such as encoding, storage and retrieval are demonstrated, resulting from the decreasing positive photocurrent of the MoS2 devices. The proposed mechanism of the memory effect when exposed to the light is elucidated in detail. Moreover, the effect of stress hormone on memory behavior is displayed via different illumination time periods and light intensities. These results indicate the potential application of MoS2 devices in artificial neural network. [Figure not available: see fulltext.]