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Synergistic Two-Step Passivation Enables Defect-Suppressed Inverted PbS Photodetectors for High-Detectivity Shortwave

Zeyao Han1, Xiao Liu1, ZiQi Lu1

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Summary
This summary is machine-generated.

High-performance inverted shortwave infrared (SWIR) photodetectors were developed using lead sulfide colloidal quantum dots (PbS CQDs). These detectors achieve high quantum efficiency and fast response, enabling practical SWIR sensing applications.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Shortwave infrared (SWIR) detection is crucial for applications like autonomous driving and biological sensing.
  • Lead sulfide colloidal quantum dots (PbS CQDs) offer tunable bandgaps and solution processability for optoelectronics.
  • Inverted SWIR photodetectors are essential for integration but face challenges with quantum efficiency.

Purpose of the Study:

  • To develop high-performance inverted SWIR photodetectors using PbS CQDs.
  • To improve quantum efficiency and carrier transport in PbS CQD photodetectors.
  • To demonstrate the potential of these detectors for practical SWIR sensing.

Main Methods:

  • Fabrication of an inverted photodetector with the structure ITO/NiOₓ/PbS-EDT/PbS-I⁻/ZnO/Al.
  • Implementation of a two-step passivation process for PbS CQDs.
  • Characterization of device performance, including quantum efficiency, detectivity, and response time.

Main Results:

  • Achieved smooth band alignment and efficient carrier transport in the device.
  • Obtained large-scale, low-defect PbS CQDs through passivation.
  • Demonstrated a quantum efficiency exceeding 40% at 1350 nm.
  • Attained a specific detectivity of 1.05 × 10¹³ Jones and a response time of 470 μs.

Conclusions:

  • The developed inverted PbS CQD photodetector shows excellent performance for SWIR sensing.
  • The high quantum efficiency and fast response meet requirements for high-resolution and high-speed applications.
  • Proof-of-concept demonstrations in SWIR imaging and fire detection confirm practical applicability.