Highly luminescent lead halide perovskite nanocrystals: from synthesis advancements to multicomponent superlattices

Maryna Bodnarchuk^a^,^b, Ihor Cherniukh^a^,^b, Gabriele Rainò^a^,^b, Thilo Stöferle^c, Max Burian^d, Alex Travesset^e, Rolf Erni^a, Rainer Mahrt^c, Maksym Kovalenko^a^,^c

^aLaboratory for Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse, 129, Dübendorf, Switzerland

^bETH Zürich, Department of Chemistry and Applied Biosciences, Switzerland, Switzerland

^cIBM Research Europe — Zurich, Rüschlikon, Switzerland, Säumerstrasse, 4, Rüschlikon, Switzerland

^dPaul Scherrer Institut, Villigen PSI, 5232, Switzerland, Forschungsstrasse 111, Villigen, Switzerland

^eIowa State University, Department of Chemistry, Ames, Iowa, USA, 50011, 1605 Gilman Hall, Ames, United States

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting 2021 (NFM21)

#PerNC21. Perovskites II: Synthesis, Characterization, and Properties of Colloidal

Online, Spain, 2021 October 18th - 22nd

Organizers: Maksym Kovalenko, Ivan Infante and Lea Nienhaus

Invited Speaker, Maryna Bodnarchuk, presentation 215
DOI: https://doi.org/10.29363/nanoge.nfm.2021.215
Publication date: 23rd September 2021

Colloidal lead halide perovskite nanocrystals (LHP NCs_,NCs,A=Cs⁺, FA⁺, FA=formamidinium; X=Cl, Br, I) have become a research spotlight owing to their spectrally narrow (<100 meV) fluorescence, tunable over the entire visible spectral region of 400-800 nm, as well as facile colloidal synthesis. These NCs are attractive single-photon emitters as well as make for an attractive building block for creating controlled, aggregated states exhibiting collective luminescence phenomena. Attaining of such states through the spontaneous self-assembly into long-range ordered superlattices (SLs) is a particularly attractive avenue. In this regard also the atomically-flat, sharp cuboic shape of LHP NCs is of interest, because vast majority of prior work had invoked NCs of rather spherical shape. Long-range ordered SLs with the simple cubic packing of cubic perovskite NCs exhibit sharp red-shifted lines in their emission spectra and superfluorescence (a fast collective emission resulting from coherent multi-NCs excited states). When combined with spherical dielectric NCs, perovskite-type ABO₃ binary NC SLs form, wherein CsPbBr₃ nanocubes occupy B- and/or O-sites, while with spherical dielectric Fe₃O₄ or NaGdF₄ NCs reside on A-sites. When truncated-cuboid PbS NCs are added to these systems, ternary ABO₃-phase form (PbS NCs occuoy B-sites). Such ABO₃ SLs, as well as other newly obtained SL structures (binary NaCl- and AlB₂-types, columnar assemblies with disks etc.), exhibit a high degree of orientational ordering of CsPbBr₃nanocubes. These mesostructures exhibit superfluorescence as well, characterized, at high excitation density, by emission pulses with ultrafast (22 ps) radiative decay and Burnham-Chiao ringing behaviour with a strongly accelerated build-up time.

References:

[1] Cherniukh, I., Rainò, G., Stöferle, T. et al. Perovskite-type superlattices from lead halide perovskite nanocubes. Nature, 2021, 593, 535–542.

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