Cation effect on anion exchange in CsPbX3 (X = Cl, Br, I) perovskite nanocrystals

J. Ahn, Y. M. Lee, W. Kim, S. J. Oh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The anion exchange in lead halide perovskite is a post-synthetic process that replaces the X-site anion with the target halide without phase transition. Various methods for adjusting the anions in perovskite nanocrystals (Pe NCs) have been developed; however, the effect of the cations in halide sources on the anion exchange has rarely been discussed. Here, we investigated the suitable chemicals and tendencies according to the cation in halide sources. NH4Cl and NaI were selected as efficient anion-exchanging chemicals because they effectively provide Cl- or I- anions to Pe NCs, respectively. Additionally, we discussed the hard-soft-acid-base (HSAB) theory. We observed that the anion-exchanged Pe NCs were well-dispersed with the original surface ligands, maintaining high colloidal stability. We believe that these findings would contribute to the improvement of optoelectronic devices, such as solar cells, displays, and light-emitting diodes (LEDs).

Original languageEnglish
Title of host publication239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology
EditorsD. K. Ko, D. Mariotti, V. Svrcek, S. J. Oh
PublisherIOP Publishing Ltd.
Pages75-82
Number of pages8
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2021
Event239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Chicago, United States
Duration: 2021 May 302021 Jun 3

Publication series

NameECS Transactions
Number1
Volume102
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021
Country/TerritoryUnited States
CityChicago
Period21/5/3021/6/3

ASJC Scopus subject areas

  • Engineering(all)

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