Infrared Detectable MoS2 Phototransistor and Its Application to Artificial Multilevel Optic-Neural Synapse

Seung Geun Kim; Seung Hwan Kim; June Park; Gwang Sik Kim; Jae Hyeun Park; Krishna C. Saraswat; Jiyoung Kim; Hyun Yong Yu

doi:10.1021/acsnano.9b03683

Infrared Detectable MoS₂ Phototransistor and Its Application to Artificial Multilevel Optic-Neural Synapse

Seung Geun Kim, Seung Hwan Kim, June Park, Gwang Sik Kim, Jae Hyeun Park, Krishna C. Saraswat, Jiyoung Kim, Hyun Yong Yu

School of Electrical Engineering

Research output: Contribution to journal › Article

Abstract

Layered two-dimensional (2D) materials have entered the spotlight as promising channel materials for future optoelectronic devices owing to their excellent electrical and optoelectronic properties. However, their limited photodetection range caused by their wide bandgap remains a principal challenge in 2D layered materials-based phototransistors. Here, we developed a germanium (Ge)-gated MoS₂ phototransistor that can detect light in the region from visible to infrared (λ = 520-1550 nm) using a detection mechanism based on band bending modulation. In addition, the Ge-gated MoS₂ phototransistor is proposed as a multilevel optic-neural synaptic device, which performs both optical-sensing and synaptic functions on one device and is operated in different current ranges according to the light conditions: dark, visible, and infrared. This study is expected to contribute to the development of 2D material-based phototransistors and synaptic devices in next-generation optoelectronics.

Original language	English
Pages (from-to)	10294-10300
Number of pages	7
Journal	ACS Nano
Volume	13
Issue number	9
DOIs	https://doi.org/10.1021/acsnano.9b03683
Publication status	Published - 2019 Jan 1

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Keywords

germanium gate
MoS phototransistor
optic-neural synapse
two-dimensional materials
wide detection range

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

Cite this

Kim, S. G., Kim, S. H., Park, J., Kim, G. S., Park, J. H., Saraswat, K. C., ... Yu, H. Y. (2019). Infrared Detectable MoS₂ Phototransistor and Its Application to Artificial Multilevel Optic-Neural Synapse. ACS Nano, 13(9), 10294-10300. https://doi.org/10.1021/acsnano.9b03683

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Access to Document

10.1021/acsnano.9b03683