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Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals
Leyre Gomez1, Junhao Lin2, Chris de Weerd1
1Institute of Physics, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
ACS Applied Materials & Interfaces
|January 23, 2018
Summary
All-inorganic cesium lead halide perovskite nanocrystals spontaneously merge, forming seamless connections at the atomic level. This natural alignment is key for developing large-area nanosheets for advanced photovoltaic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- All-inorganic cesium lead halide perovskite nanocrystals (CsPbX3) exhibit excellent optoelectronic properties.
- Their cubic shape and narrow size distribution make them suitable for homogeneous thin films in photovoltaics and optoelectronics.
- Spontaneous merging of CsPbBr3 nanocrystals has been observed, influenced by humidity and temperature.
Purpose of the Study:
- To investigate the atomic-level mechanisms of nanocrystal aggregation in CsPbX3.
- To understand how merging affects the elemental composition and electronic structure.
- To explore the potential for creating large-area perovskite materials.
Main Methods:
- Atom-resolved annular dark-field imaging microscopy.
- Valence electron energy loss spectroscopy (VEELS).
- Low-voltage monochromatic scanning transmission electron microscopy (STEM).
Main Results:
- The merging process preserves the elemental composition and electronic structure of CsPbBr3.
- Aggregation occurs between nanocrystals of varying sizes and orientations.
- Seamless stitching was observed between crystallographically aligned nanocrystals, analogous to graphene.
Conclusions:
- Crystallographic alignment occurs naturally in drop-casted CsPbX3 layers.
- This natural alignment is a crucial first step for developing large-area nanosheets.
- These findings pave the way for predesigned band gap energies and large-scale inorganic perovskite photovoltaics.
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