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A polar-switchable and controllable negative phototransistor for information encryption.

Aiping Cao1, Shubing Li1, Hongli Chen1

  • 1Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China. zghu@ee.ecnu.edu.cn.

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|September 11, 2023
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Negative photoconductance (NPC) in novel WSe2/CIPS ferroelectric heterostructure transistors is explored. This research demonstrates controllable switching between NPC and positive photoconductance (PPC), enabling new optical encryption technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Anomalous negative phototransistors, where current decreases under illumination, are a growing research field.
  • Negative photoconductance (NPC) remains less explored compared to positive photoconductance (PPC).
  • Existing research lacks comprehensive understanding and application of NPC phenomena.

Purpose of the Study:

  • To design and investigate ferroelectric field-effect transistors (FeFETs) exhibiting both NPC and PPC.
  • To elucidate the underlying mechanisms of inverse photoconductance in vdW heterostructures.
  • To explore the potential of these phenomena for advanced optical encryption applications.

Main Methods:

  • Fabrication of WSe2/CIPS van der Waals (vdW) vertical heterostructures with a buried-gated architecture.
  • Experimental characterization of transistor photoresponse, including NPC and PPC.
  • Theoretical investigation using Density Functional Theory (DFT) to understand ferroelectric polarization and charge transfer.

Main Results:

  • Demonstrated FeFETs exhibiting both NPC and PPC, controlled by ferroelectric polarization.
  • Identified dynamic switching of ferroelectric polarization and interfacial charge transfer as key mechanisms for inverse photoconductance.
  • Achieved controllable and polarity-switchable PPC and NPC phenomena.

Conclusions:

  • The study advances the understanding and development of negative photoconductance (NPC).
  • The controllable coexistence of NPC and PPC offers significant potential for optical encryption and secure communication.
  • This work paves the way for novel secure data storage and transmission technologies.