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Updated: May 2, 2026
11:04
Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor IRIS
Published on: May 3, 2011
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Shortwave Infrared Light Detection and Ranging Using Silver Telluride Quantum Dots
Yongjie Wang1, Hao Wu1, Carmelita Rodà1
1The Barcelona Institute of Science and Technology, ICFO-Insitut de Ciencies Fotoniques, Castelldefels, Barcelona, 08860, Spain.
Advanced Materials (Deerfield Beach, Fla.)
|March 31, 2025
Summary
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.
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.
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