Spontaneous orientation-tuning driven by the strain variation in self-assembled ZnO-SrRuO3 heteroepitaxy
Chang, Wei Sea
KAUST DepartmentElectrical Engineering Program
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AbstractHeteroepitaxial ZnO and SrRuO3 were grown on SrTiO3 (111) substrates and formed a self-assembled wurtzite-perovskite nanostructure. Spontaneous orientation-tuning of the SrRuO3 pillars was observed, with the growth direction changing from SRO to SRO as the film thickness increased, which is attributed to a misfit strain transition from the biaxial strain imposed by the SrTiO3 substrate to the vertical strain provided by the ZnO matrix. The -SrRuO3 and -ZnO combination presents a favorable matching in the nanocomposite films, resulting in higher charge carrier mobility. This vertically integrated configuration and regulation on the crystallographic orientations are expected to be employed in designing multi-functional nanocomposite systems for applications in electronic devices.
CitationSpontaneous orientation-tuning driven by the strain variation in self-assembled ZnO-SrRuO3 heteroepitaxy 2015, 107 (19):191902 Applied Physics Letters
SponsorsThis work was supported by the National Natural Science Foundation of China (Grant Nos. 51371031, 51371102, 51571021, and 51390475); National Basic Research Program of China (2011CB606406); the National Science Council, Taiwan (NSC-101-2119-M-009-003-MY2); Ministry of Education, Taiwan (MOE-ATU 101W961); and Center for interdisciplinary science of National Chiao Tung University.
JournalApplied Physics Letters