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Polarization-Resolved Position-Sensitive Self-Powered Binary Photodetection in Multilayer Janus CrSBr.

Jaganandha Panda1, Satyam Sahu1,2, Golam Haider1

  • 1J. Heyrovský Institute of Physical Chemistry, Dolejskova 3, 182 23 Prague 8, Czech Republic.

ACS Applied Materials & Interfaces
|December 26, 2023
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Summary
This summary is machine-generated.

We developed a self-powered photodetector using CrSBr single crystals for optical polarization resolution. This device shows high performance and stability, enabling advanced optoelectronic applications.

Keywords:
CrSBrJanus 2D layeroptical polarization detectionposition sensitivityself-powered photodetector

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Low-symmetry 2D materials are crucial for advanced optoelectronic devices like quantum communication and sensing.
  • Polarization-resolved photodetection is key for applications requiring light polarization analysis.

Purpose of the Study:

  • To fabricate and characterize an optical polarization-resolving photodetector using multilayer semiconducting CrSBr single crystals.
  • To investigate the self-powered photodetection capabilities and polarization-dependent photoresponse of the CrSBr material.

Main Methods:

  • Fabrication of a photodetector using multilayer CrSBr single crystals and gold (Au) electrodes.
  • Measurement of photoresponsivity, detectivity, and dichroic ratio under 514 nm laser excitation.
  • Assessment of device stability under ambient conditions over an extended period.

Main Results:

  • Demonstrated self-powered photodetection via Schottky junctions at Au-CrSBr interfaces.
  • Achieved a photoresponsivity of ~0.26 mA/W and detectivity of 3.4 × 10^8 Jones.
  • Observed a large dichroic ratio of 3.4 for polarization along the a- and b-axes.
  • Exhibited excellent stability, retaining >95% photoresponsivity for over five months.

Conclusions:

  • CrSBr is a promising material for high-performance, ultralow-powered optical polarization-resolving optoelectronic devices.
  • The self-powered nature and stability of CrSBr photodetectors make them suitable for demanding technological applications.
  • The unique polarization-dependent photoresponse opens avenues for novel sensing and imaging technologies.