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Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Approaching Bulk Mobility in PbSe Colloidal Quantum Dots 3D Superlattices.

Jacopo Pinna¹, Razieh Mehrabi Koushki¹, Dnyaneshwar S Gavhane¹

¹Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh, 4, Groningen, 9747 AG, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)

|October 29, 2022

Summary

Researchers achieved high electron mobility in 3D colloidal quantum dot superlattices by controlling nanoscale ordering. This breakthrough enables advanced optoelectronic devices with tunable properties and efficient charge transport.

Keywords:

colloidal quantum dots metamaterials mobility self-assembly superlattices

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Area of Science:

Materials Science
Nanotechnology
Quantum Physics

Background:

3D superlattices of colloidal quantum dots (CQDs) offer tunable optical properties and coherent electrical transport.
Previous 2D arrays had limited order and high disorder, hindering performance.
Achieving long-range order in 3D CQD systems is crucial for advanced optoelectronics.

Purpose of the Study:

To demonstrate nanoscale-level controlled ordering of CQDs in 3D large-area superlattices.
To achieve outstanding charge transport properties in these 3D CQD metamaterials.
To pave the way for next-generation optoelectronic devices.

Main Methods:

Fabrication of 3D superlattices using controlled ordering of colloidal quantum dots.
Characterization of structural order and energetic disorder at the nanoscale.
Measurement of electron mobilities in the fabricated 3D CQD solids.

Main Results:

Achieved nanoscale-level controlled ordering of CQDs in 3D and over large areas.
Reported the highest electron mobilities ever for self-assembled, fully quantum-confined objects.
Demonstrated optoelectronic metamaterials with tunable short-wavelength infrared optical properties.

Conclusions:

Controlled ordering in 3D CQD superlattices significantly enhances charge transport properties.
Electron mobilities approach those of bulk semiconductors, overcoming previous limitations.
This work enables a new generation of high-performance optoelectronic devices.