4.7 Article

Structural analysis of the ZnO/MgO superlattices on a-polar ZnO substrates grown by MBE

Journal

APPLIED SURFACE SCIENCE
Volume 587, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2022.152830

Keywords

Zinc oxide; Magnesium oxide; Quasi-ternary alloys; Interdiffusion; Nanomaterials; TEM

Funding

  1. NCN [DEC-2018/28/C/ST3/00285]

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This study analyzed heteroepitaxially grown ZnO/MgO superlattices on a-oriented ZnO substrates. It found that the different crystalline structures of ZnO and MgO influence the abruptness of the interface and the retention of the wurtzite structure. The wurtzite structure can be retained in the MgO thin barriers, but it inevitably leads to non-uniform biaxial strains and interdiffusion of Mg from barriers to ZnO QW's. The complex strain/composition heterogeneities can be explained by the difference in vapor pressure between Mg and Zn elements and the high mobility of Mg atoms. A ZnMgO film of three monolayers size was created at the interfaces, which partly contributes to retaining the wurtzite structure of the coherently grown MgO layers.
The analysis of heteroepitaxially grown ZnO/MgO superlattices on a-oriented ZnO substrates was described. The influence of unalike natural crystalline structures of ZnO and MgO on the interface's abruptness and retaining wurtzite crystallinity was studied. Wurtzite structure was found to be retained in the MgO thin barriers up to 1.5 nm, but creation of nonuniform biaxial strains and some interdiffusion of Mg from barriers to ZnO QW's seemed to be inevitable. The complex strain/composition heterogeneities can be explained by the difference of vapor pressure between Mg (p = 1.93 Pa) and Zn (p = 0.22 Pa) elements at growth temperatures and high mobility of Mg atoms, which are gladly incorporated into ZnO matrix. As a result, a subtle three monolayers in size ZnMgO film was created at the interfaces, which was partly responsible for retaining the wurtzite structure of coherently grown MgO layers.

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