Surface reconstruction causes structural variations in nanometric amorphous Al₂O₃

Abstract

Surface reconstruction is shown to exist in nanometric amorphous films of Al2O3, causing different short-range order at the surface.

Nanoscale Encapsulation of Hybrid Perovskites Using Hybrid Atomic Layer Deposition

“…The coating appeared to be highly uniform in thickness, following the surface contour of the microcrystalline perovskite grains without any noticeable discontinuity (i.e., pinhole-free). The fast Fourier transform (FFT) pattern of the TEM image showed that the Al 2 O 3 layer was amorphous (Figure B, insets), consistent with the typical crystallinity reported in other ALD-coated Al 2 O 3 . − The atomic ratio between Al and O, indicated in the energy-dispersive X-ray spectrum (EDS, Figure C), appeared to be close to the 2:3. This ratio matched with the expected stoichiometry of Al 2 O 3 , implying that the precursors were sufficiently reacted under the chosen conditions.…”