Spontaneous orientation-tuning driven by the strain variation in self-assembled ZnO-SrRuO3 heteroepitaxy

Yuanmin Zhu, Wei Sea Chang, Rong Yu, Ruirui Liu, Tzu-Chiao Wei, Jr-Hau He, Ying-Hao Chu, Qian Zhan

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Heteroepitaxial 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 [111]SRO to [011]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 [011]-SrRuO3 and [0001]-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.
Original languageEnglish (US)
Pages (from-to)191902
JournalApplied Physics Letters
Issue number19
StatePublished - Nov 9 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This 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.


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