TY - JOUR
T1 - Suppression of Auger Recombination by Gradient Alloying in InAs/CdSe/CdS QDs
AU - Sagar, Laxmi Kishore
AU - Bappi, Golam
AU - Johnston, Andrew
AU - Chen, Bin
AU - Todorović, Petar
AU - Levina, Larissa
AU - Saidaminov, Makhsud I.
AU - García De Arquer, F. Pelayo
AU - Nam, Dae Hyun
AU - Choi, Min Jae
AU - Hoogland, Sjoerd
AU - Voznyy, Oleksandr
AU - Sargent, Edward H.
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/9/22
Y1 - 2020/9/22
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85093119530
U2 - 10.1021/acs.chemmater.0c01788
DO - 10.1021/acs.chemmater.0c01788
M3 - Article
AN - SCOPUS:85093119530
SN - 0897-4756
VL - 32
SP - 7703
EP - 7709
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 18
ER -