Issue 18, 2024

Investigation of potassium doping and defect healing mechanism in core–shell CsPbBr3/SiO2 quantum dots

Abstract

In this work, we firstly succeed in revealing the exact K+ doping and defect healing mechanism in core–shell CsPbBr3/SiO2 QDs. The K+ doping mechanism depended on the K+ doping concentration. The K ions were doped into interstitial sites at low K+ doping concentrations (1 and 2%); however, the K ions were substituted into Cs+ sites at high K+ doping concentration (3%). K ions were doped into core–shell CsPbBr3/SiO2 QDs, which induced the lattice strains in the crystal structure, leading to structural distortions. These lattice strains were simultaneously relaxed by external stimuli and underwent crystal reconstruction, resulting in the diffusion of K ions within the lattice. This sequence of processes converted the disordered structures into ordered structures. The multi-passivation process of introducing K+ into the core–shell CsPbBr3/SiO2 QDs not only enhanced the photoluminescence quantum yields (PLQYs) but also improved the environmental stabilities by reducing the trap density and preventing the penetration of polar molecules by the SiO2 shell.

Graphical abstract: Investigation of potassium doping and defect healing mechanism in core–shell CsPbBr3/SiO2 quantum dots

Supplementary files

Article information

Article type
Communication
Submitted
08 Feb 2024
Accepted
23 Apr 2024
First published
24 Apr 2024

J. Mater. Chem. C, 2024,12, 6395-6405

Investigation of potassium doping and defect healing mechanism in core–shell CsPbBr3/SiO2 quantum dots

D. Kim, Y. Jo, S. Kim, S. Yim, J. Lee and C. Lee, J. Mater. Chem. C, 2024, 12, 6395 DOI: 10.1039/D4TC00537F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements