Abstract：
:Multi-layer structure of functional materials often involves the integration of different crystalline phases. The film growth orientation thus frequently exhibits a transformation, owing to multiple possibilities caused by incompatible in-plane structural symmetry. Nevertheless, the detailed mechanism of the transformation has not yet been fully explored. Here we thoroughly probe the heteroepitaxially grown hexagonal zinc oxide (ZnO) films on cubic (001)-magnesium oxide (MgO) substrates using advanced scanning transition electron microscopy, X-ray diffraction and first principles calculations, revealing two distinct interface models of (001) ZnO/(001) MgO and (100) ZnO/(001) MgO. We have found that the structure alternatives are controlled thermodynamically by the nucleation, while kinetically by the enhanced Zn adsorption and O diffusion upon the phase transformation. This work not only provides a guideline for the interface fabrication with distinct crystalline phases but also shows how polar and non-polar hexagonal ZnO films might be manipulated on the same cubic substrate.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhou H,Wu L,Wang HQ,Zheng JC,Zhang L,Kisslinger K,Li Y,Wang Z,Cheng H,Ke S,Li Y,Kang J,Zhu Ydoi
10.1038/s41467-017-01655-5subject
Has Abstractpub_date
2017-11-14 00:00:00pages
1474issue
1issn
2041-1723pii
10.1038/s41467-017-01655-5journal_volume
8pub_type
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