在Zn1-x Mg x O中,x=0.4~0.6仍为一个岩盐矿和纤锌矿共存的结构,影响了其晶格质量。本文利用等离子体辅助的分子束外延设备在c面蓝宝石衬底上外延生长了ZnO/ZnMgO超晶格,并改变其生长过程中的Ⅱ-Ⅵ比,利用原子力显微镜、X射线衍射、透射谱和X射线光电子能谱对样品进行了表征分析。发现在较低氧分压下制备的样品结构以岩盐矿为主导,而在较高氧分压下两相共存并以纤锌矿为主。这种相分离现象与裂解氧原子的密度有关。
【英文摘要】
ZnMgO alloy allows for tunable optoelectronic devices. However,the compositional range between ZnO and MgO is interrupted by a crystalline miscibility gap where the wurtzite crystal structure of ZnO is structurally incompatible with the rocksalt structure of MgO. In this article,ten periods of ZnO / ZnMgO superlattice were produced by plasma-assistant molecular beam epitaxy on cplane sapphire substrate with different oxygen condition. It is found that the sample grown at lower oxygen flow and radio-frenquen...
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