Plasma assisted molecular beam epitaxy of Cu2O on MgO(001): Influence of copper flux on epitaxial orientation
Plasma assisted molecular beam epitaxy of Cu2O on MgO(001): Influence of copper flux on epitaxial orientation
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DOI：
10.1016/j.jcrysgro.2015.11.041
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发表时间：
2016-02-15
影响因子：
1.8
通讯作者：
Eickhoff, M.
中科院分区：
文献类型：
--
作者：
Kracht, M.;Schoermann, J.;Eickhoff, M.
我们报道了通过等离子体辅助分子束外延在 MgO(001) 上生长氧化亚铜。与平行于 MgO(100) 取向的 Cu2O(110) 取向微晶相比，增加的铜氧比增强了 Cu2O 微晶的立方体上立方体生长。这与生长过程中观察到的 (3 root 2x root 2)R45 度表面重建的发生相关。众所周知，这种重建在富氧条件下不稳定，与 Cu2O(110) 表面相比，它可以稳定 Cu2O(001) 表面，从而获得更高的铜氧比，从而增强立方体叠立方体的生长。对所得立方体叠立方体 Cu2O 层的高分辨率 X 射线衍射分析表明，部分弛豫达到 39.7%。对薄膜的光吸收和光致发光特性的研究揭示了与单晶相当的激子贡献。 (C) 2015 Elsevier B.V. 保留所有权利。
We report on the growth of cuprous oxide on MgO(001) by plasma-assisted molecular beam epitaxy. An increased copper to oxygen ratio enhances the cube-on-cube growth of the Cu2O crystallites compared to the Cu2O(110)parallel to MgO(100) oriented crystallites. This correlates with the occurrence of a (3 root 2x root 2)R45 degrees surface reconstruction observed during growth. This reconstruction is known to be unstable under oxygen-rich conditions and stabilizes the Cu2O(001) surface compared to the Cu2O(110) surface for higher copper to oxygen ratios enhancing cube-on-cube growth.High resolution X-ray diffraction analysis of the resulting cube-on-cube Cu2O layers indicates partial relaxation by 39.7%. Investigations of the optical absorption and photoluminescence properties of the films reveal excitonic contributions comparable to those of single crystals. (C) 2015 Elsevier B.V. All rights reserved.