【摘 要】
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The controlled growth of Zn-polar ZnO films on Al-terminated α-Al2O3 (0001) substrates is investigated by the radio-frequency plasma-assisted molecular beam ep
【机 构】
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Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of S
论文部分内容阅读
The controlled growth of Zn-polar ZnO films on Al-terminated α-Al2O3 (0001) substrates is investigated by the radio-frequency plasma-assisted molecular beam epitaxy method. Prior to the growth, α-Al2O3 (0001) surface is modified by an ultrathin MgO layer, which serves as a uniform template for epitaxy of Zn-polar ZnO films. The microstructures of ZnO/MgO/Al2O3 interface are investigated by in-situ reflection high-energy electron diffraction observations and ex-situ high-resolution transmission electron microscopy characterization. It is found that under Mg-rich condition, the achievement of the wurtzite MgO ultrathin layer plays a key role in the subsequent growth of Zn-polar ZnO. An interfacial atomic model is proposed to explain the mechanism of polarity selection of both MgO and ZnO films.
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