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High-Sensitivity SWIR Photodetector Based on PbS Quantum Dots via Solution-Phase MAPI Ligand Exchange.

Yuntae Ha1,2, JinBeom Kwon3, Saewan Kim4

  • 1Advanced Mobility System Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea.

Sensors (Basel, Switzerland)
|June 12, 2026
PubMed
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Researchers developed a new short-wave infrared (SWIR) sensor using lead sulfide quantum dots (PbS QDs) with inorganic ligands. This advancement enhances eye-safe LIDAR systems for applications like autonomous driving.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Short-wave infrared (SWIR) sensors are vital for LIDAR systems in autonomous transportation, robotics, and security.
  • Demand is increasing for eye-safe SWIR sensors operating above 1400 nm.
  • Quantum dot (QD)-based SWIR sensors offer tunable wavelengths and selective detection but suffer from low sensitivity due to long organic ligands.

Purpose of the Study:

  • To improve the sensitivity and stability of QD-based SWIR photodetectors.
  • To replace insulating organic ligands on PbS QDs with conductive inorganic ligands.
  • To fabricate and characterize a SWIR photodetector using MAPI-capped PbS QDs.

Main Methods:

  • Synthesized lead sulfide quantum dots (PbS QDs).
Keywords:
LIDARPbS QDsSWIRphotodetectorquantum dots

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  • Replaced long organic ligands with short inorganic methylammonium lead iodide (MAPI) ligands in solution.
  • Fabricated a SWIR photodetector device using the MAPI-capped PbS QDs.

    • Main Results:

    • The MAPI-capped PbS QD photodetector demonstrated high performance in the 1400-1500 nm range.
    • Achieved an external quantum efficiency (EQE) of 62%.
    • Obtained a responsivity of 0.73 A/W and a detectivity of 2.26 × 1011 Jones.

    Conclusions:

    • Replacing organic ligands with inorganic MAPI ligands significantly enhances PbS QD photodetector performance.
    • The developed SWIR photodetector is suitable for eye-safe LIDAR applications.
    • Solution-based fabrication offers a cost-effective and scalable approach for advanced SWIR sensors.