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Combining reflection high-energy electron diffraction, high-resolution transmission electron microscopy, and high-angle annular dark field scanning transmission electron microscopy we unveil the existence of a peculiar transition from a three-dimensional to a two-dimensional growth mode in anatase TiO2/LaAlO3 heterostructures. Such a growth dynamics is accompanied by Al interdiffusion from substrate to the growing film up to a critical thickness of 20 nm. With the extra support of ab initio calculations, we show that the crossover between the two growth modes corresponds to the formation of two distinct regions characterized by (103)- and (101)-oriented crystallographic shear superstructures, occurring in the upmost film region and in proximity of the film/substrate interface, respectively.
Springer Netherlands
Publication date: 
1 Jun 2013

Regina Ciancio, Andrea Vittadini, Annabella Selloni, Riccardo Arpaia, Carmela Aruta, Fabio Miletto Granozio, Umberto Scotti Di Uccio, Giorgio Rossi, Elvio Carlino

Biblio References: 
Volume: 15 Issue: 6 Pages: 1-8
Journal of nanoparticle research