All-Perovskite Multicomponent Nanocrystal Superlattices
Taras Sekh a b, Gabriele Rainò a b, Ihor Cherniukh a b, Etsuki Kobiyama c, Modestos Athanasiou e, Andreas Manoli e, Thomas Sheehan f, Federica Bertolotti g, William Tisdale f, Thilo Stöferle c, Rolf Erni d, Norberto Masciocchi g, Antonietta Guagliardi h, Grigorios Itskos e, Maryna Bodnarchuk a b, Maksym Kovalenko a b
a Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
b Laboratory of Thin Films and Photovoltaics, Empa — Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse, 129, Dübendorf, Switzerland
c IBM Research Europe — Zurich, Säumerstrasse, 4, Rüschlikon, Switzerland
d Electron Microscopy Center, Empa – Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse, 129, Dübendorf, Switzerland
e Experimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
f Massachusetts Institute of Technology (MIT), Department of Chemical Engineering, Green Bldg, Cambridge, MA 02142, EE. UU., Cambridge, United States
g Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, via Valleggio 11, I-22100 Como, Italy
h Istituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, via Valleggio 11, I-22100 Como, Italy
Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM23)
Peyia, Cyprus, 2023 November 13th - 15th
Organizers: Grigorios Itskos, Maksym Kovalenko and Maryna Bodnarchuk
Oral, Taras Sekh, presentation 022
Publication date: 18th August 2023

Self-assembly of colloidal nanocrystals (NCs) into highly ordered structures – superlattices (SLs) – became feasible a few decades ago with the first successful syntheses of monodisperse and shape-uniform colloidal NCs [1]. Close NCs' proximity in the SLs with a long-range positional and orientational ordering facilitate the emergence of diverse synergistic and collective effects different from ensemble-average properties. In this regard, monodisperse and size-tunable lead halide perovskite NCs have drawn much attention owing to their spectrally tunable and narrow, fast and optically coherent (at low temperature) fluorescence. In particular, CsPbBr3 NCs assembled into the single-component SLs were shown to exhibit superfluorescent emission [2]. This stimulated the research into their multicomponent SLs, where lead halide perovskite NCs are co-assembled with dielectric NCs acting as spacers between fluorescent NCs. Consequently, a plethora of novel SL types has become accessible, displaying the superfluorescence phenomena as well [3]. An interesting avenue is to devise superlattices comprising several distinct kinds of light emitters. To this end, we succeeded to co-assemble differently sized CsPbBr3 NCs into binary SLs with a high degree of ordering and a large domain area. This enabled us to reveal, for the first time, a highly efficient Foster-like energy transfer from strongly confined NCs to weakly confined ones in multicomponent CsPbBr3 NC SLs. The strong excitonic coupling between NCs was also manifested by the accelerated exciton diffusion.

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