Strongly Confined CsPbBr<sub>3</sub> Quantum Dots as Quantum Emitters and Building Blocks for Rhombic Superlattices.

Boehme, Simon C; Bodnarchuk, Maryna I; Burian, Max; Bertolotti, Federica; Cherniukh, Ihor; Bernasconi, Caterina; Zhu, Chenglian; Erni, Rolf; Amenitsch, Heinz; Naumenko, Denys; Andrusiv, Hordii; Semkiv, Nazar; John, Rohit Abraham; Baldwin, Alan; Galkowski, Krzysztof; Masciocchi, Norberto; Stranks, Samuel D; Rainò, Gabriele; Guagliardi, Antonietta; Kovalenko, Maksym V

Strongly Confined CsPbBr₃ Quantum Dots as Quantum Emitters and Building Blocks for Rhombic Superlattices.

Boehme, Simon C; Bodnarchuk, Maryna I; Burian, Max; Bertolotti, Federica; Cherniukh, Ihor; Bernasconi, Caterina; Zhu, Chenglian; Erni, Rolf; Amenitsch, Heinz; Naumenko, Denys; Andrusiv, Hordii; Semkiv, Nazar; John, Rohit Abraham; Baldwin, Alan; Galkowski, Krzysztof; Masciocchi, Norberto; Stranks, Samuel D; Rainò, Gabriele; Guagliardi, Antonietta; Kovalenko, Maksym V.

Afiliación

Boehme SC; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Bodnarchuk MI; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Burian M; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Bertolotti F; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Cherniukh I; Swiss Light Source, Paul Scherrer Institute, 5232 Villigen, Switzerland.
Bernasconi C; Department of Science and High Technology and To.Sca.Lab., University of Insubria, via Valleggio 11, 22100 Como, Italy.
Zhu C; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Erni R; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Amenitsch H; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Naumenko D; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Andrusiv H; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Semkiv N; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
John RA; Electron Microscopy Center, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Baldwin A; Institute of Inorganic Chemistry, Graz University of Technology, 8010 Graz, Austria.
Galkowski K; Institute of Inorganic Chemistry, Graz University of Technology, 8010 Graz, Austria.
Masciocchi N; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Stranks SD; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Rainò G; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
Guagliardi A; Laboratory for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Kovalenko MV; Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.

ACS Nano ; 17(3): 2089-2100, 2023 Feb 14.

Article en En | MEDLINE | ID: mdl-36719353

ABSTRACT

ABSTRACT

The success of the colloidal semiconductor quantum dots (QDs) field is rooted in the precise synthetic control of QD size, shape, and composition, enabling electronically well-defined functional nanomaterials that foster fundamental science and motivate diverse fields of applications. While the exploitation of the strong confinement regime has been driving commercial and scientific interest in InP or CdSe QDs, such a regime has still not been thoroughly explored and exploited for lead-halide perovskite QDs, mainly due to a so far insufficient chemical stability and size monodispersity of perovskite QDs smaller than about 7 nm. Here, we demonstrate chemically stable strongly confined 5 nm CsPbBr3 colloidal QDs via a postsynthetic treatment employing didodecyldimethylammonium bromide ligands. The achieved high size monodispersity (7.5% ± 2.0%) and shape-uniformity enables the self-assembly of QD superlattices with exceptional long-range order, uniform thickness, an unusual rhombic packing with an obtuse angle of 104°, and narrow-band cyan emission. The enhanced chemical stability indicates the promise of strongly confined perovskite QDs for solution-processed single-photon sources, with single QDs showcasing a high single-photon purity of 73% and minimal blinking (78% "on" fraction), both at room temperature.

Palabras clave

colloidal nanocrystals; excitons; perovskites; quantum confinement; self-assembly

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