Structural and optical investigations of periodically polarity inverted ZnO heterostructures on (0001) Al2O3
Structural and optical investigations of periodically polarity inverted ZnO heterostructures on (0001) Al2O3
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DOI：
10.1063/1.3114989
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发表时间：
2009-04-06
影响因子：
4
通讯作者：
Yao, T.
中科院分区：
文献类型：
--
作者：
Park, J. S.;Goto, T.;Yao, T.
报道了在（0001）Al_2 O_3衬底上制作的周期性极性反转结构ZnO一维光栅的结构和光学特性。通过透射电子显微镜可以清楚地观察到Zn-和O-极性ZnO区域之间的反型畴边界（IDBs）。空间分辨的局部光致发光（PL）的调查显示，强激子发射的界面区域，包括IDBs。从原子组态、载流子收集、寿命以及在Zn和O极性区的扩散过程等方面讨论了产生强PL的可能机制。因此，作者得出结论，IDBs可以是活跃的强发射，而不是一个无辐射中心。
We report the structural and optical properties of one-dimensional grating of ZnO consisting of periodically polarity inverted structures on (0001) Al2O3 substrates. The inversion domain boundaries (IDBs) between the Zn- and the O-polar ZnO regions were clearly observed by transmission electronic microscopy. The investigation of spatially resolved local photoluminescence (PL) revealed strong excitonic emission at the interfacial region including the IDBs. The possible mechanism of strong PL has been discussed by the consideration of atomic configuration and carrier collection including its lifetime and diffusion process in Zn- and O-polar regions. Therefore the authors conclude that the IDBs can be active for the strong emission not a nonradiative center.