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Shortwave Infrared Light Detection and Ranging Using Silver Telluride Quantum Dots.

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Surface-engineered silver telluride (Ag₂Te) colloidal quantum dots (CQDs) show enhanced performance for shortwave infrared (SWIR) optoelectronics. These improved Ag₂Te CQDs enable high-resolution SWIR light detection and ranging (LiDAR) applications.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Quantum Dot Technology

Background:

  • Shortwave infrared (SWIR) light is crucial for imaging and LiDAR due to its

Purpose of the Study:

  • To enhance the performance of Ag₂Te CQD photodiodes for SWIR applications.
  • To address limitations in dark current, response speed, and linear dynamic range (LDR).

Main Methods:

  • Post-synthesis surface engineering of Ag₂Te CQDs.
  • Doping control during CQD fabrication.
  • Fabrication and characterization of Ag₂Te CQD photodiodes.

Main Results:

  • Achieved a low dark current of 450 nA cm⁻² at -0.5 V.
  • Demonstrated a linear dynamic range (LDR) exceeding 150 dB.
  • Obtained a rapid response speed of approximately 25 ns.

Conclusions:

  • Surface engineering and doping significantly improve Ag₂Te CQD photodiode performance.
  • Proof-of-concept SWIR LiDAR achieved decimetre-level resolution over 10 m.
  • Advanced Ag₂Te CQDs are promising for consumer electronics and automotive SWIR applications.