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

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


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 languageEnglish
Pages (from-to)10294-10300
Number of pages7
JournalACS nano
Issue number9
Publication statusPublished - 2019 Sep 24


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

ASJC Scopus subject areas

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


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