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Compact Quantum Dots for Single-molecule Imaging
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Micron Thick Colloidal Quantum Dot Solids.

James Z Fan1, Maral Vafaie1, Koen Bertens1

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

Nano Letters
|June 17, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a blade-coating method for thick shortwave infrared colloidal quantum dot (SWIR-CQD) films, overcoming spin-coating limitations. This advancement significantly enhances SWIR-CQD solar cell performance and photon harvesting capabilities.

Keywords:
blade coatinginfrared photovoltaicsligand exchangequantum dots

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Shortwave infrared colloidal quantum dots (SWIR-CQDs) are promising semiconductors for solar energy harvesting.
  • Current SWIR-CQD solar cells utilize spin-coating, which limits film thickness to approximately 500 nm, leading to cracking and reduced efficiency.
  • Thicker films are desirable for improved light absorption and higher photocurrents.

Purpose of the Study:

  • To develop a scalable fabrication method for thick SWIR-CQD films.
  • To overcome the thickness limitations and cracking issues associated with spin-coating.
  • To enhance the performance of SWIR-CQD solar cells through improved film morphology and light harvesting.

Main Methods:

  • A novel ligand exchange and resolvation process was developed to disperse SWIR-CQDs effectively.
  • A quaternary ink was engineered using high-viscosity solvents and short QD stabilizing ligands.
  • Blade-coating technique was employed on a mild heating bed to deposit micron-thick SWIR-CQD films.

Main Results:

  • Micron-thick SWIR-CQD films were successfully fabricated using the blade-coating method.
  • The fabricated SWIR-CQD solar cells achieved a short-circuit current density (Jsc) of 39 mA cm-2, harvesting 60% of incident photons under AM1.5G.
  • External quantum efficiency (EQE) measurements showed peaks around 80% beyond 1400 nm, representing the highest reported for solution-processed semiconductors.

Conclusions:

  • Blade-coating is a viable strategy for producing thick, crack-free SWIR-CQD films.
  • The engineered ink formulation and coating process enable enhanced light harvesting and improved solar cell performance.
  • This work sets a new benchmark for solution-processed semiconductors in the shortwave infrared spectrum.