Development of a Highly Reliable PbS QDs-Based SWIR Photodetector Based on Metal Oxide Electron/Hole Extraction Layer...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Infrared photodetectors are crucial for LiDAR sensors in automation but often use expensive, potentially unsafe near-infrared (NIR) technology.
• Lead sulfide quantum dots (PbS QDs) offer an eye-safe, cost-effective alternative for short-wavelength infrared (SWIR) detection via solution processing.
• Existing PbS QD photodetectors suffer from poor chemical stability, hindering patterning and array fabrication.

Purpose of the Study:

• To enhance the stability and performance of PbS QD-based SWIR photodetectors.
• To enable reliable patterning and array fabrication for practical applications in automation.

Main Methods:

• Utilized sputtering to deposit bulk Nickel Oxide (NiO) and Zinc Oxide (ZnO) for uniform thin film formation.
• Optimized thin film thickness and annealing conditions for improved photodetector performance.
• Fabricated PbS QD-based SWIR photodetectors using enhanced electron/hole extraction layers.

Main Results:

• Achieved uniform and patternable thin films using sputtered NiO and ZnO.
• Significantly improved the performance of PbS QD photodetectors through optimized fabrication.
• Demonstrated a high response characteristic of 114.3% due to optimized band gap and enhanced transmittance.

Conclusions:

• Sputtered NiO and ZnO layers effectively improve the stability and processability of PbS QD SWIR photodetectors.
• Optimized fabrication leads to enhanced photodetector performance, paving the way for scalable array production.
• The developed photodetectors are suitable for eye-safe, cost-effective LiDAR applications in automotive and industrial automation.