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Colloidal PbS Quantum Dot Photodiode Imager with Suppressed Dark Current.

Ya Wang1, Huicheng Hu2, Mohan Yuan1

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

ACS Applied Materials & Interfaces
|December 7, 2023
PubMed
Summary

Controlled oxidation improves lead sulfide (PbS) colloidal quantum dot (CQD) films for photodetectors (PDs), significantly reducing dark current and enhancing detectivity for advanced infrared imaging applications.

Keywords:
PbS CQDsTFT imagerdark currentoxidationphotodetectors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Lead sulfide (PbS) colloidal quantum dots (CQDs) are promising for low-cost infrared photodetectors (PDs).
  • The p-i-n device architecture commonly uses PbS CQD films treated with 1,2-ethanedithiol (EDT) as p-type layers.
  • PbS-EDT films suffer from low quality and defects, limiting device performance.

Purpose of the Study:

  • To develop a controlled oxidation process for surface passivation of PbS-EDT transport layers.
  • To improve the performance of PbS CQD photodetectors by addressing film quality issues.
  • To demonstrate the application of optimized CQD PDs in advanced infrared imaging.

Main Methods:

  • A controlled oxidation process was applied to the PbS-EDT layer for surface passivation.
  • Characterization techniques including transient absorption spectra and electrochemical impedance spectra were used.
  • PbS CQD PDs with optimized hole transport layers (HTLs) were fabricated and tested.
  • The optimized CQD PDs were integrated with thin film transistor (TFT) readout circuits for imaging.

Main Results:

  • Controlled oxidation dramatically decreased dark current density by nearly two orders of magnitude.
  • Carrier lifetime increased, and carrier recombination was suppressed in oxidized PbS-EDT CQDs.
  • Specific detectivity (D*) of the optimized device was 3.4 times higher than the control device.
  • The integrated CQD PD successfully performed material discrimination, occlusion, and smoke penetration imaging.

Conclusions:

  • Controlled oxidation is a significant strategy for surface management of CQD solids.
  • This approach effectively enhances the performance of PbS CQD photodetectors.
  • The findings are expected to advance infrared optoelectronic applications utilizing CQDs.