Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals

Leyre Gomez, Junhao Lin, Chris De Weerd, Lucas Poirier, Simon C. Boehme, Elizabeth Von Hauff, Yasufumi Fujiwara, Kazutomo Suenaga, Tom Gregorkiewicz

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

All-inorganic cesium lead halide perovskite nanocrystals are extensively studied because of their outstanding optoelectronic properties. Being of a cubic shape and typically featuring a narrow size distribution, CsPbX3 (X = Cl, Br, and I) nanocrystals are the ideal starting material for the development of homogeneous thin films as required for photovoltaic and optoelectronic applications. Recent experiments reveal spontaneous merging of drop-casted CsPbBr3 nanocrystals, which is promoted by humidity and mild-temperature treatments and arrested by electron beam irradiation. Here, we make use of atom-resolved annular dark-field imaging microscopy and valence electron energy loss spectroscopy in a state-of-the-art low-voltage monochromatic scanning transmission electron microscope to investigate the aggregation between individual nanocrystals at the atomic level. We show that the merging process preserves the elemental composition and electronic structure of CsPbBr3 and takes place between nanocrystals of different sizes and orientations. In particular, we reveal seamless stitching for aligned nanocrystals, similar to that reported in the past for graphene flakes. Because the crystallographic alignment occurs naturally in drop-casted layers of CsPbX3 nanocrystals, our findings constitute the essential first step toward the development of large-area nanosheets with band gap energies predesigned by the nanocrystal choice - the gateway to large-scale photovoltaic applications of inorganic perovskites.

Original languageEnglish
Pages (from-to)5984-5991
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number6
DOIs
Publication statusPublished - 14 Feb 2018

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Perovskite
Nanocrystals
Merging
Optoelectronic devices
Cesium
Graphite
perovskite
Nanosheets
Electron energy loss spectroscopy
Crystal orientation
Graphene
Electronic structure
Electron beams
Atmospheric humidity
Microscopic examination
Energy gap
Electron microscopes
Agglomeration
Lead
Irradiation

Keywords

  • EELS
  • high-resolution TEM
  • inorganic perovskites
  • merging
  • nanocrystals
  • seamless stitching

Cite this

Gomez, Leyre ; Lin, Junhao ; De Weerd, Chris ; Poirier, Lucas ; Boehme, Simon C. ; Von Hauff, Elizabeth ; Fujiwara, Yasufumi ; Suenaga, Kazutomo ; Gregorkiewicz, Tom. / Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 6. pp. 5984-5991.
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Gomez, L, Lin, J, De Weerd, C, Poirier, L, Boehme, SC, Von Hauff, E, Fujiwara, Y, Suenaga, K & Gregorkiewicz, T 2018, 'Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals' ACS Applied Materials and Interfaces, vol. 10, no. 6, pp. 5984-5991. https://doi.org/10.1021/acsami.7b17432

Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals. / Gomez, Leyre; Lin, Junhao; De Weerd, Chris; Poirier, Lucas; Boehme, Simon C.; Von Hauff, Elizabeth; Fujiwara, Yasufumi; Suenaga, Kazutomo; Gregorkiewicz, Tom.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 6, 14.02.2018, p. 5984-5991.

Research output: Contribution to JournalArticleAcademicpeer-review

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