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

Title
Suppression of Auger Recombination by Gradient Alloying in InAs/CdSe/CdS QDs
Authors
Sagar, Laxmi KishoreBappi, GolamJohnston, AndrewChen, BinTodorovic, PetarLevina, LarissaSaidaminov, Makhsud, Ide Arquer, F. Pelayo GarciaNam, Dae-HyunChoi, Min-JaeHoogland, SjoerdVoznyy, OleksandrSargent, Edward H.
DGIST Authors
Sagar, Laxmi Kishore; Bappi, Golam; Johnston, Andrew; Chen, Bin; Todorovic, Petar; Levina, Larissa; Saidaminov, Makhsud, I; de Arquer, F. Pelayo Garcia; Nam, Dae-Hyun; Choi, Min-Jae; Hoogland, Sjoerd; Voznyy, Oleksandr; Sargent, Edward H.
Issue Date
2020-09
Citation
Chemistry of Materials, 32(18), 7703-7709
Type
Article
Article Type
Article
Keywords
CARRIER MULTIPLICATIONQUANTUM DOTSNANOCRYSTALSDYNAMICSBRIGHT
ISSN
0897-4756
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 similar to<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 similar to 10(5) ps compared to 17 ps for control InAs/CdSe/CdS CQDs. This represents a 2x increase of the Auger lifetime relative to the best value reported for InAs CQDs in prior literature. Copyright © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/12796
DOI
10.1021/acs.chemmater.0c01788
Publisher
American Chemical Society
Related Researcher
  • Author Nam, Dae-Hyun Renewable Energy Conversion Materials Laboratory
  • Research Interests Carbon dioxide reduction; Water splitting; Energy conversion; Electrochemistry; Materials Science
Files:
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Collection:
Department of Energy Science and EngineeringRenewable Energy Conversion Materials Laboratory1. Journal Articles


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