Ultralow Power Optical Synapses Based on MoS 2 Layers by Indium-Induced Surface Charge Doping for Biomimetic Eyes

Yunxia Hu*, Mingjin Dai, Wei Feng, Xin Zhang, Feng Gao, Shichao Zhang, Biying Tan, Jia Zhang, Yong Shuai, Yongqing Fu, PingAn Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Biomimetic eyes, with their excellent imaging functions such as large fields of view and low aberrations, have shown great potentials in the fields of visual prostheses and robotics. However, high power consumption and difficulties in device integration severely restrict their rapid development. In this study, an artificial synaptic device consisting of a molybdenum disulfide (MoS2) film coated with an electron injection enhanced indium (In) layer is proposed to increase the channel conductivity and reduce the power consumption. This artificial synaptic device achieves an ultralow power consumption of 68.9 aJ per spike, which is several hundred times lower than those of the optical artificial synapses reported in literature. Furthermore, the multilayer and polycrystalline MoS2 film shows persistent photoconductivity performance, effectively resulting in short-term plasticity, long-term plasticity, and their transitions between each other. A 5 × 5 In/MoS2 synaptic device array is constructed into a hemispherical electronic retina, demonstrating its impressive image sensing and learning functions. This research provides a new methodology for effective control of artificial synaptic devices, which have great opportunities used in bionic retinas, robots, and visual prostheses.
Original languageEnglish
Article number2104960
Pages (from-to)1-11
Number of pages11
JournalAdvanced Materials
Early online date16 Oct 2021
DOIs
Publication statusE-pub ahead of print - 16 Oct 2021

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