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Related Experiment Videos

Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells.

Hyekyoung Choi1,2, Jong-Gun Lee3, Xuan Dung Mai1

  • 1Nano-Mechanical Systems Research Division, Korea institute of Machinery and Materials (KIMM), Daejeon, 34103, Korea.

Scientific Reports
|April 6, 2017
PubMed
Summary

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This study introduces a novel supersonic spraying method for depositing thin lead sulfide (PbS) quantum dot (QD) films. This technique offers precise thickness control and high efficiency for quantum dot solar cells.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Controlling quantum dot (QD) film thickness is challenging with traditional methods due to poor colloidal stability, high-boiling-point solvents, and one-step deposition limitations.
  • Existing techniques struggle with uniform film formation and require post-deposition annealing, increasing complexity and cost.

Purpose of the Study:

  • To develop a new, efficient protocol for depositing high-quality lead sulfide (PbS) quantum dot (QD) films with controlled thickness.
  • To overcome the limitations of conventional QD film formation techniques for photovoltaic applications.

Main Methods:

  • Utilized electrical double-layered PbS QD inks prepared via solution-phase ligand exchange with methyl ammonium lead iodide (MAPbI3).
  • Employed supersonic spraying for rapid solvent evaporation and QD ink deposition, eliminating the need for post-deposition annealing.

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  • Controlled film thickness by adjusting the number of spraying sweeps.

    • Main Results:

    • Achieved rapid deposition (within 1 minute) of high-quality n-type PbS QD films using minimal ink (<5 mg per device).
    • Demonstrated facile hole extraction by forming a p-layer with mercaptopropionic acid treatment.
    • Attained a power conversion efficiency of 3.7% under 1.5 AM illumination.

    Conclusions:

    • The supersonic spraying technique provides a rapid and effective method for fabricating controlled-thickness PbS QD films.
    • This approach enables efficient hole extraction and enhances the performance of quantum dot solar cells.
    • The developed protocol offers a promising pathway for scalable and cost-effective production of QD-based photovoltaic devices.