title: Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure.
abstract: Metal-halide semiconductors with perovskite crystal structure are attractive due to their facile solution processability, and have recently been harnessed very successfully for high-efficiency photovoltaics and bright light sources. Here, we show that at low temperature single colloidal cesium lead halide (CsPbX3, where X = Cl/Br) nanocrystals exhibit stable, narrow-band emission with suppressed blinking and small spectral diffusion. Photon antibunching demonstrates unambiguously nonclassical single-photon emission with radiative decay on the order of 250 ps, representing a significant acceleration compared to other common quantum emitters. High-resolution spectroscopy provides insight into the complex nature of the emission process such as the fine structure and charged exciton dynamics.
authors.affiliation: IBM Research-Zurich , Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Rainò
authors.affiliation: Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1, 8093 Zürich, Switzerland.|Laboratory for Thin Films and Photovoltaics, EMPA-Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland.
authors.forename: Georgian
authors.initials: G
authors.lastname: Nedelcu
authors.affiliation: Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1, 8093 Zürich, Switzerland.|Laboratory for Thin Films and Photovoltaics, EMPA-Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland.
authors.forename: Loredana
authors.initials: L
authors.lastname: Protesescu
authors.affiliation: Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1, 8093 Zürich, Switzerland.|Laboratory for Thin Films and Photovoltaics, EMPA-Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland.
authors.forename: Maryna I
authors.initials: MI
authors.lastname: Bodnarchuk
authors.affiliation: Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1, 8093 Zürich, Switzerland.|Laboratory for Thin Films and Photovoltaics, EMPA-Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland.
authors.forename: Maksym V
authors.initials: MV
authors.lastname: Kovalenko
authors.affiliation: IBM Research-Zurich , Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
authors.forename: Rainer F
authors.initials: RF
authors.lastname: Mahrt
authors.affiliation: IBM Research-Zurich , Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
authors.forename: Thilo
authors.initials: T
authors.lastname: Stöferle
keywords: halides; nanocrystals; optoelectronics; perovskites; quantum dots; single photon sources