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Orthogonal colloidal quantum dot inks enable efficient multilayer optoelectronic devices

Author

Listed:
  • Seungjin Lee

    (University of Toronto)

  • Min-Jae Choi

    (University of Toronto
    Dongguk University)

  • Geetu Sharma

    (University of Toronto Scarborough)

  • Margherita Biondi

    (University of Toronto)

  • Bin Chen

    (University of Toronto)

  • Se-Woong Baek

    (University of Toronto
    Korea University)

  • Amin Morteza Najarian

    (University of Toronto)

  • Maral Vafaie

    (University of Toronto)

  • Joshua Wicks

    (University of Toronto)

  • Laxmi Kishore Sagar

    (University of Toronto)

  • Sjoerd Hoogland

    (University of Toronto)

  • F. Pelayo García Arquer

    (University of Toronto)

  • Oleksandr Voznyy

    (University of Toronto Scarborough)

  • Edward H. Sargent

    (University of Toronto)

Abstract

Surface ligands enable control over the dispersibility of colloidal quantum dots (CQDs) via steric and electrostatic stabilization. Today’s device-grade CQD inks have consistently relied on highly polar solvents: this enables facile single-step deposition of multi-hundred-nanometer-thick CQD films; but it prevents the realization of CQD film stacks made up of CQDs having different compositions, since polar solvents redisperse underlying films. Here we introduce aromatic ligands to achieve process-orthogonal CQD inks, and enable thereby multifunctional multilayer CQD solids. We explore the effect of the anchoring group of the aromatic ligand on the solubility of CQD inks in weakly-polar solvents, and find that a judicious selection of the anchoring group induces a dipole that provides additional CQD-solvent interactions. This enables colloidal stability without relying on bulky insulating ligands. We showcase the benefit of this ink as the hole transport layer in CQD optoelectronics, achieving an external quantum efficiency of 84% at 1210 nm.

Suggested Citation

  • Seungjin Lee & Min-Jae Choi & Geetu Sharma & Margherita Biondi & Bin Chen & Se-Woong Baek & Amin Morteza Najarian & Maral Vafaie & Joshua Wicks & Laxmi Kishore Sagar & Sjoerd Hoogland & F. Pelayo Garc, 2020. "Orthogonal colloidal quantum dot inks enable efficient multilayer optoelectronic devices," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18655-7
    DOI: 10.1038/s41467-020-18655-7
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