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

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

doi:10.1149/10201.0075ecst

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

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

Department of Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

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 language	English
Title of host publication	239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology
Editors	D. K. Ko, D. Mariotti, V. Svrcek, S. J. Oh
Publisher	IOP Publishing Ltd.
Pages	75-82
Number of pages	8
Edition	1
ISBN (Electronic)	9781607689133
DOIs	https://doi.org/10.1149/10201.0075ecst
Publication status	Published - 2021
Event	239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Chicago, United States Duration: 2021 May 30 → 2021 Jun 3

Publication series

Name	ECS Transactions
Number	1
Volume	102
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Conference

Conference	239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021
Country/Territory	United States
City	Chicago
Period	21/5/30 → 21/6/3

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/10201.0075ecst

Cite this

Ahn, J., Lee, Y. M., Kim, W., & Oh, S. J. (2021). Cation effect on anion exchange in CsPbX₃ (X = Cl, Br, I) perovskite nanocrystals. In D. K. Ko, D. Mariotti, V. Svrcek, & S. J. Oh (Eds.), 239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology (1 ed., pp. 75-82). (ECS Transactions; Vol. 102, No. 1). IOP Publishing Ltd.. https://doi.org/10.1149/10201.0075ecst

Cation effect on anion exchange in CsPbX₃ (X = Cl, Br, I) perovskite nanocrystals. / Ahn, J.; Lee, Y. M.; Kim, W. et al.
239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology. ed. / D. K. Ko; D. Mariotti; V. Svrcek; S. J. Oh. 1. ed. IOP Publishing Ltd., 2021. p. 75-82 (ECS Transactions; Vol. 102, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ahn, J, Lee, YM, Kim, W & Oh, SJ 2021, Cation effect on anion exchange in CsPbX₃ (X = Cl, Br, I) perovskite nanocrystals. in DK Ko, D Mariotti, V Svrcek & SJ Oh (eds), 239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology. 1 edn, ECS Transactions, no. 1, vol. 102, IOP Publishing Ltd., pp. 75-82, 239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021, Chicago, United States, 21/5/30. https://doi.org/10.1149/10201.0075ecst

Ahn J, Lee YM, Kim W, Oh SJ. Cation effect on anion exchange in CsPbX₃ (X = Cl, Br, I) perovskite nanocrystals. In Ko DK, Mariotti D, Svrcek V, Oh SJ, editors, 239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Quantum Dot Science and Technology. 1 ed. IOP Publishing Ltd. 2021. p. 75-82. (ECS Transactions; 1). doi: 10.1149/10201.0075ecst

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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).",

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N2 - 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).

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