Reflection high energy electron diffraction, atomic force microscopy, and theoretical studies based on classical nucleation theory have been used to interpret the morphology, orientation relationship, and stability of Cu 2 O nanoclusters on SrTiO3 (100) (STO). We propose that the competing interfacial and elastic energies facilitate an in-plane rotation of the Cu2 O clusters by 45° with respect to the STO substrate and stabilize Cu2 O clusters on STO(100) with an orientation relationship of (001) Cu2 O // (001) SrTiO3 and 〈 100 〉 Cu2 O // 〈110〉SrTiO3. Our preliminary theoretical analysis also suggests that this particular orientation results in smaller critical nucleus sizes and lower nucleation barriers and also indicates a chemical potential (growth rate) dependence of the orientation relationship.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)