Au/PdSe₂/Graphene-Based Anisotropic Two-Dimensional Heterojunction for Near-Infrared Polarization Photoelectric...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Anisotropic 2D materials are key for polarization-sensitive photoelectric synapses and integrated polarization detection.
• Current research primarily focuses on visible light, with limited understanding of photocurrent regulation in polarized synaptic systems.

Purpose of the Study:

• To achieve polarization-sensitive synaptic functionality in the near-infrared (NIR) spectrum.
• To investigate factors influencing photocurrents and explore regulatory methods in NIR polarized synaptic systems.

Main Methods:

• Fabrication of a heterostructure using gold (Au), palladium diselenide (PdSe2), and graphene.
• Characterization of the heterostructure's photoresponse and polarization sensitivity at NIR wavelengths.
• Systematic tuning of the polarization ratio by varying optical power density.

Main Results:

• Successfully realized polarization-sensitive synaptic functionality in the NIR regime.
• Achieved a maximum polarization ratio of 6.5 at 2200 nm with ultra-low energy consumption (1.48 pJ).
• Demonstrated tunable polarization ratio (4.9 to 6.5) by adjusting optical power density.

Conclusions:

• The Au/PdSe2/graphene heterostructure effectively addresses the need for NIR polarization perception.
• Provides valuable insights into regulating polarized photocurrents for high dynamic range optoelectronic devices.
• Paves the way for advanced miniaturized integrated polarization detection systems.