The power conversion efficiencies of lead halide perovskite thin film solar cells have surged in the short time since their inception. Compounds, such as ionic liquids (ILs), have been explored as chemical additives and interface modifiers in perovskite solar cells, contributing to the rapid increase in cell efficiencies. However, due to the small surface area-to-volume ratio of the large grained polycrystalline halide perovskite films, an atomistic understanding of the interaction between ILs and perovskite surfaces is limited. Here, we use quantum dots (QDs) to study the coordinative surface interaction between phosphonium-based ILs and CsPbBr3. When native oleylammonium oleate ligands are exchanged off the QD surface with the phosphonium cation as well as the IL anion, a threefold increase in photoluminescent quantum yield of as-synthesized QDs is observed. The CsPbBr3 QD structure, shape, and size remain unchanged after ligand exchange, indicating only a surface ligand interaction at approximately equimolar additions of the IL. Increased concentrations of the IL lead to a disadvantageous phase change and a concomitant decrease in photoluminescent quantum yields. Valuable information regarding the coordinative interaction between certain ILs and lead halide perovskites has been elucidated and can be used for informed pairing of beneficial combinations of IL cations and anions.
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7 May 2023
Research Article|
May 05 2023
The surface chemistry of ionic liquid-treated CsPbBr3 quantum dots
Special Collection:
40 Years of Colloidal Nanocrystals in JCP
Kyle D. Crans
;
Kyle D. Crans
(Formal analysis, Investigation, Writing – original draft)
1
Department of Chemistry, University of Southern California
, Los Angeles, California 90089, USA
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Matthew Bain;
Matthew Bain
(Formal analysis, Investigation)
1
Department of Chemistry, University of Southern California
, Los Angeles, California 90089, USA
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Stephen E. Bradforth
;
Stephen E. Bradforth
(Resources)
1
Department of Chemistry, University of Southern California
, Los Angeles, California 90089, USA
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Dan Oron
;
Dan Oron
a)
(Conceptualization, Funding acquisition, Resources, Supervision, Writing – review & editing)
2
Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science
, Rehovot 76100, Israel
a)Authors to whom correspondence should be addressed: dan.oron@weizmann.ac.il; miri.kazes@weizmann.ac.il; and brutchey@usc.edu
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Miri Kazes
;
Miri Kazes
a)
(Conceptualization, Funding acquisition, Resources, Supervision, Writing – review & editing)
2
Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science
, Rehovot 76100, Israel
a)Authors to whom correspondence should be addressed: dan.oron@weizmann.ac.il; miri.kazes@weizmann.ac.il; and brutchey@usc.edu
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Richard L. Brutchey
Richard L. Brutchey
a)
(Conceptualization, Funding acquisition, Resources, Supervision, Writing – review & editing)
1
Department of Chemistry, University of Southern California
, Los Angeles, California 90089, USA
a)Authors to whom correspondence should be addressed: dan.oron@weizmann.ac.il; miri.kazes@weizmann.ac.il; and brutchey@usc.edu
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a)Authors to whom correspondence should be addressed: dan.oron@weizmann.ac.il; miri.kazes@weizmann.ac.il; and brutchey@usc.edu
Note: This paper is part of the JCP Special Topic on 40 Years of Colloidal Nanocrystals in JCP.
J. Chem. Phys. 158, 174709 (2023)
Article history
Received:
February 27 2023
Accepted:
April 19 2023
Citation
Kyle D. Crans, Matthew Bain, Stephen E. Bradforth, Dan Oron, Miri Kazes, Richard L. Brutchey; The surface chemistry of ionic liquid-treated CsPbBr3 quantum dots. J. Chem. Phys. 7 May 2023; 158 (17): 174709. https://doi.org/10.1063/5.0147918
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