Issue 1, 2021

Deciphering the excited-state dynamics and multicarrier interactions in perovskite core–shell type hetero-nanocrystals

Abstract

Deciphering and modulating the carrier dynamics of perovskite nanocrystals (Pe-NCs) is crucial for their optoelectronic applications, which remains elusive to date. Herein, we, for the first time, explore the ultrafast dynamics of perovskite core–shell type NCs using CsPbBr3@ZnS as a model system. According to the transient spectroscopic characterization, a physical picture of the ultrafast dynamics in core–shell Pe-NCs is built. Specifically, we directly observed the “hot” hole transfer from CsPbBr3 to ZnS and confirmed the formation of charge-transfer state in CsPbBr3@ZnS NCs. Such ultrafast (<100 fs) hole rearrangement speeds up the carrier cooling and breaks the hot phonon bottleneck effect in Pe-NCs. Moreover, thanks to the charge separation in CsPbBr3@ZnS NCs, the Auger recombination is largely suppressed and the Auger lifetime is increased nearly 5-fold compared to that of “pure” CsPbBr3 NCs, which endows CsPbBr3@ZnS NCs with unique optical gain properties. These results are informative for halide perovskite-based applications, such as photocatalysis, hot-carrier photovoltaics and lasers.

Graphical abstract: Deciphering the excited-state dynamics and multicarrier interactions in perovskite core–shell type hetero-nanocrystals

Supplementary files

Article information

Article type
Paper
Submitted
25 Sep 2020
Accepted
26 Nov 2020
First published
07 Dec 2020

Nanoscale, 2021,13, 292-299

Deciphering the excited-state dynamics and multicarrier interactions in perovskite core–shell type hetero-nanocrystals

Y. Ren, Z. Nie, F. Deng, Z. Wang, S. Xia and Y. Wang, Nanoscale, 2021, 13, 292 DOI: 10.1039/D0NR06884E

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