Issue 76, 2023

Quantum shells versus quantum dots: suppressing Auger recombination in colloidal semiconductors

Abstract

Colloidal semiconductor nanocrystals (NCs) have attracted a great deal of attention in recent decades. The quantum efficiency of many optoelectronic processes based on these nanomaterials, however, declines with increasing optical or electrical excitation intensity. This issue is caused by Auger recombination of multiple excitons, which converts the NC energy into excess heat, whereby reducing the efficiency and lifespan of NC-based devices, including lasers, photodetectors, X-ray scintillators, and high-brightness LEDs. Recently, semiconductor quantum shells (QSs) have emerged as a viable nanoscale architecture for the suppression of Auger decay. The spherical-shell geometry of these nanostructures leads to a significant reduction of Auger decay rates, while exhibiting a near unity photoluminescence quantum yield. Here, we compare the optoelectronic properties of quantum shells against other low-dimensional semiconductors and discuss their emerging opportunities in solid-state lighting and energy-harvesting applications.

Graphical abstract: Quantum shells versus quantum dots: suppressing Auger recombination in colloidal semiconductors

Article information

Article type
Feature Article
Submitted
24 May 2023
Accepted
04 Sep 2023
First published
04 Sep 2023

Chem. Commun., 2023,59, 11337-11348

Author version available

Quantum shells versus quantum dots: suppressing Auger recombination in colloidal semiconductors

J. Beavon, J. Huang, D. Harankahage, M. Montemurri, J. Cassidy and M. Zamkov, Chem. Commun., 2023, 59, 11337 DOI: 10.1039/D3CC02091F

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