Edge-Based Two-Dimensional α-In2Se3-MoS2 Ferroelectric Field Effect Device

Debopriya Dutta, Subhrajit Mukherjee, Michael Uzhansky, Pranab K. Mohapatra, Ariel Ismach, Elad Koren*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Heterostructures based on two-dimensional materials offer the possibility to achieve synergistic functionalities, which otherwise remain secluded by their individual counterparts. Herein, ferroelectric polarization switching in α-In2Se3 has been utilized to engineer multilevel nonvolatile conduction states in a partially overlapping α-In2Se3-MoS2-based ferroelectric semiconducting field effect device. In particular, we demonstrate how the intercoupled ferroelectric nature of α-In2Se3 allows to nonvolatilely switch between n-i and n-i-n type junction configurations based on a novel edge state actuation mechanism, paving the way for subnanometric scale nonvolatile device miniaturization. Furthermore, the induced asymmetric polarization enables enhanced photogenerated carriers’ separation, resulting in an extremely high photoresponse of ∼1275 A/W in the visible range and strong nonvolatile modulation of the bright A- and B- excitonic emission channels in the overlaying MoS2 monolayer. Our results show significant potential to harness the switchable polarization in partially overlapping α-In2Se3-MoS2 based FeFETs to engineer multimodal, nonvolatile nanoscale electronic and optoelectronic devices.

Original languageEnglish
Pages (from-to)18505-18515
Number of pages11
JournalACS Applied Materials and Interfaces
Issue number14
StatePublished - 12 Apr 2023


  • 2D materials
  • InSe
  • MoS
  • intercoupled ferroelectricity
  • photodetector


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