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).
|Title of host publication
|239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology
|D. K. Ko, D. Mariotti, V. Svrcek, S. J. Oh
|IOP Publishing Ltd.
|Number of pages
|Published - 2021
|239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Chicago, United States
Duration: 2021 May 30 → 2021 Jun 3
|239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021
|21/5/30 → 21/6/3
Bibliographical noteFunding Information:
This research was supported by the Creative Materials Discovery Program through the NRF funded by the Ministry of Science and ICT (NRF-2018M3D1A1059001) and by the National Research Foundation of Korea (NRF-2021M3H4A3026733).
© The Electrochemical Society
ASJC Scopus subject areas
- General Engineering