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Related Concept Videos

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Broadband Photodetection and On-Chip Convolution Computing Based on PdSe2/Si van der Waals Heterojunction Arrays.

Yu Du1,2, Yaru Shi1,2, Xingyu Zhao1,2

  • 1State Key Laboratory of Luminescence Science and Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, P. R. China.

ACS Applied Materials & Interfaces
|May 4, 2026
PubMed
Summary

Researchers developed a novel Palladium diselenide (PdSe2)/Silicon photodetector array. This device enables broadband photodetection, polarization imaging, and in-sensor computing, paving the way for advanced intelligent optoelectronics.

Keywords:
broadband photodetectionheterojunction arrayson-chip convolutionpolarization imagingself-powered

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Two-dimensional Palladium diselenide (PdSe2) shows promise for intelligent optoelectronics due to tunable bandgap and anisotropy.
  • Current PdSe2 photodetectors are single-pixel, limiting spatial sensing and on-chip processing.
  • There is a need for scalable platforms integrating multiple optical functions.

Purpose of the Study:

  • To develop a PdSe2/Si van der Waals heterojunction photodetector array.
  • To integrate broadband photodetection, polarization imaging, and in-sensor optical computing.
  • To demonstrate a unified and scalable platform for intelligent optoelectronic systems.

Main Methods:

  • In situ growth of PdSe2/Si van der Waals heterojunctions.
  • Fabrication of a photodetector array architecture.
  • Characterization of photoresponse, polarization imaging, and in-sensor computing capabilities.

Main Results:

  • The self-powered device shows broadband photoresponse (375–1550 nm) with high responsivity (203.89 mA/W) and detectivity (3.3 × 10^11 Jones) in the infrared.
  • Real-time optical transmission of ASCII information demonstrated at 1310 nm under zero bias.
  • Polarization-resolved imaging and in-sensor edge extraction/image sharpening achieved.

Conclusions:

  • The PdSe2/Si heterojunction array offers a versatile platform for advanced optoelectronic applications.
  • The device enables simultaneous broadband detection, polarization imaging, and in-sensor computing.
  • This work presents a significant step towards integrated intelligent optoelectronic systems.