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BP/PdSe2 heterojunction device for broadband polarization-sensitive synaptic simulation, logic operation, navigation,

Yanxia Li1, Wenhao Fan1, Mengyang Li1

  • 1Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin Key Laboratory of Photoelectric Materials and Devices, National Demonstration Center for Experimental Function Materials Education, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.

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|December 6, 2025
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A novel anisotropic black phosphorus/palladium diselenide (BP/PdSe2) van der Waals heterojunction device demonstrates wide-band photoresponse and polarization sensitivity. This breakthrough enables advanced applications like all-day image recognition and artificial neural networks.

Keywords:
All-day image processing and recognitionBP/PdSe(2) vdW heterojunctionLogic operationPolarizationPolarized navigation simulationSynaptic simulation

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Area of Science:

  • Materials Science and Engineering
  • Optoelectronics
  • Nanotechnology

Background:

  • Visual function is crucial for organism interaction, with polarization sensitivity enabling processing of natural polarized light.
  • Replicating polarization-sensitive vision in semiconductor devices presents significant challenges.
  • Existing semiconductor devices struggle to achieve wide-band photoresponse and polarization sensitivity simultaneously.

Purpose of the Study:

  • To propose and investigate an anisotropic black phosphorus/palladium diselenide (BP/PdSe2) van der Waals (vdW) heterojunction device.
  • To explore the device's capability for wide-band photoelectric response from visible to short-wave infrared light.
  • To demonstrate multi-functional applications including image processing, artificial neural networks, and synaptic simulation.

Main Methods:

  • Fabrication of an anisotropic BP/PdSe2 vdW heterojunction device.
  • Characterization of the device's photoelectric response across a wide spectrum (visible to short-wave infrared).
  • Evaluation of the device's performance in image edge processing, logical operations, synaptic simulation, and artificial neural network applications.

Main Results:

  • The BP/PdSe2 device exhibits a wide-band photoresponse from visible to short-wave infrared.
  • Achieved high responsivity (0.459 A/W) and anisotropy ratio (1.41) under 638 nm laser irradiation, with responses to multiple wavelengths.
  • Successfully demonstrated image recognition (color, shape, night vision), synaptic simulation, and polarization-sensitive navigation mimicry.

Conclusions:

  • The anisotropic BP/PdSe2 vdW heterojunction device offers a promising platform for advanced optoelectronic systems.
  • The device's multi-functional capabilities, including polarization sensitivity and synaptic simulation, pave the way for intelligent applications.
  • This work provides a potential technique for developing intelligent optoelectronic systems and artificial compound eyes.