Highly Stable Perovskite Supercrystals via Oil-in-Oil Templating

Yingying Tang, Leyre Gomez, Arnon Lesage, Emanuele Marino, Thomas E. Kodger, Janne Mieke Meijer, Paul Kolpakov, Jie Meng, Kaibo Zheng, Tom Gregorkiewicz, Peter Schall*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Inorganic perovskites display an enticing foreground for their wide range of optoelectronic applications. Recently, supercrystals (SCs) of inorganic perovskite nanocrystals (NCs) have been reported to possess highly ordered structure as well as novel collective optical properties, opening new opportunities for efficient films. Here, we report the large-scale assembly control of spherical, cubic, and hexagonal SCs of inorganic perovskite NCs through templating by oil-in-oil emulsions. We show that an interplay between the roundness of the cubic NCs and the tension of the confining droplet surface sets the superstructure morphology, and we exploit this interplay to design dense hyperlattices of SCs. The SC films show strongly enhanced stability for at least two months without obvious structural degradation and minor optical changes. Our results on the controlled large-scale assembly of perovskite NC superstructures provide new prospects for the bottom-up production of optoelectronic devices based on the microfluidic production of mesoscopic building blocks.

Original languageEnglish
Pages (from-to)5997-6004
Number of pages8
JournalNano Letters
Volume20
Issue number8
DOIs
Publication statusPublished - 12 Aug 2020

Keywords

  • assembly
  • emulsion-droplet templating
  • perovskite films
  • stability
  • supercrystals

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