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Orthogonal colloidal quantum dot inks enable efficient multilayer optoelectronic devices.

Seungjin Lee¹, Min-Jae Choi^1,2, Geetu Sharma³

¹Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, ON, M5S 1A4, Canada.

Nature Communications

|September 24, 2020

Summary

This summary is machine-generated.

New aromatic ligands allow colloidal quantum dot (CQD) inks to be processed in weakly-polar solvents. This enables the creation of multilayered CQD solids for advanced optoelectronic devices.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Colloidal quantum dots (CQDs) are crucial for optoelectronics, with dispersibility controlled by surface ligands.
Current CQD inks use polar solvents, limiting film stacking due to redispersion issues.

Purpose of the Study:

To develop process-orthogonal CQD inks for fabricating multilayered CQD solids.
To investigate aromatic ligands for stable CQD dispersions in weakly-polar solvents.

Main Methods:

Synthesized CQDs with aromatic ligands, varying the anchoring group.
Evaluated CQD ink solubility and colloidal stability in weakly-polar solvents.
Fabricated and characterized CQD-based optoelectronic devices.

Main Results:

Aromatic ligands with judiciously selected anchoring groups induced dipoles, enhancing CQD-solvent interactions.
Achieved colloidal stability in weakly-polar solvents without bulky ligands.
Demonstrated a CQD hole transport layer with 84% external quantum efficiency at 1210 nm.

Conclusions:

Aromatic ligands offer a pathway to process-orthogonal CQD inks.
This enables the fabrication of multifunctional multilayered CQD solids.
The developed inks show significant potential for high-performance CQD optoelectronics.