Interfacial B-Site Ion Diffusion in All-Inorganic Core/Shell Perovskite Nanocrystals

Shuya Li, Hanjie Lin, Chun Chu, Chandler Martin, Walker MacSwain, Robert W. Meulenberg, John M. Franck, Arindam Chakraborty, Weiwei Zheng

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

All-inorganic metal halide perovskites (ABX3, X = Cl, Br, or I) show great potential for the fabrication of optoelectronic devices, but the toxicity and instability of lead-based perovskites limit their applications. Shell passivation with a more stable lead-free perovskite is a promising strategy to isolate unstable components from the environment as well as a feasible way to tune the optical properties. However, it is challenging to grow core/shell perovskite nanocrystals (NCs) due to the soft ionic nature of the perovskite lattice. In this work, we developed a facile method to grow a lead-free CsMnCl3 shell on the surface of CsPbCl3 NCs to form CsPbCl3/CsMnCl3 core/shell NCs with enhanced environmental stability and improved photoluminescence (PL) quantum yields (QYs). More importantly, the resulting core/shell perovskite NCs have color-tunable PL due to B-site ion diffusion at the interface of the core/shell NCs. Specifically, B-site Mn diffusion from the CsMnCl3 shell to the CsPbCl3 core leads to a Mn-doped CsPbCl3 core (i.e., Mn:CsPbCl3), which can turn on the Mn PL at around 600 nm. The ratio of Mn PL and host CsPbCl3 PL is highly tunable as a function of the thermal annealing time of the CsPbCl3/CsMnCl3 core/shell NCs. While the halide anion exchange for all-inorganic metal halide perovskites has been well-developed for band-gap-engineered materials, interfacial B-site diffusion in core/shell perovskite NCs is a promising approach for both tunable optical properties and enhanced environmental stability.

Original languageEnglish (US)
Pages (from-to)22467-22477
Number of pages11
JournalACS nano
Volume17
Issue number22
DOIs
StatePublished - Nov 28 2023

Keywords

  • core/shell nanocrystals
  • enhanced stability
  • ion diffusion
  • lead-free perovskites
  • optical properties

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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