DataVXChemistry of MaterialsPaper
journal article·2020-09-22Open access

Suppression of Auger Recombination by Gradient Alloying in InAs/CdSe/CdS QDs

Laxmi Kishore Sagar, Golam Bappi, Andrew Johnston, Bin Chen, Petar Todorović, Larissa Levina, Makhsud I. Saidaminov, F. Pelayo García de Arquer, Dae-Hyun Nam, Min-Jae Choi, Sjoerd Hoogland, Oleksandr Voznyy, Edward H. Sargent

Chemistry of Materials· Volume 32· Issue 18
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Source abstract

Abstract

Colloidal quantum dots are promising for low-cost optoelectronic devices such as solar cells, light-emitting diodes (LEDs), lasers, and photodetectors. InAs-based quantum dots (QDs) are well suited for near-infrared (NIR) applications; however, to date, the highest-QY InAs QDs have exhibited short biexciton Auger lifetimes of ∼<50 ps. Here, we report a band engineering strategy that doubles the Auger lifetime in InAs CQDs. By developing a continuously graded thick CdSexS1–x shell, we synthesize InAs/CdSexS1–x/CdS CQDs that enable a smooth progression from the core to the outer shell, slowing the Auger process. We report a biexciton Auger lifetime of ∼105 ps compared to 17 ps for control InAs/CdSe/CdS CQDs. This represents a 2× increase of the Auger lifetime relative to the best value reported for InAs CQDs in prior literature.
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Research context

Metals & alloysElectronic materials

OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada

Department of Chemistry and Electrical & Computer Engineering, Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria, British Columbia V8P 5C2, Canada

Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea

Department of Chemical and Biochemical Engineering, Dongguk University, Seoul 04620, Republic of Korea

Department of Physical and Environmental Sciences, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada

Funding

Natural Sciences and Engineering Research Council of Canada · Ontario Research Fund

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