Growth Mechanism and Photo luminescent Properties of AlN/ZnO Heterostructures
Growth Mechanism and Photo luminescent Properties of AlN/ZnO Heterostructures
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DOI：
10.1021/jp103029z
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发表时间：
2010-06-24
影响因子：
3.7
通讯作者：
Xie, Erqing
中科院分区：
文献类型：
--
作者：
Song, Jie;Zhou, Jinyuan;Xie, Erqing
我们提出了一种制备AlN/ZnO异质结构的新方法：AlN/ZnO同轴纳米管异质结构（CNH）和AlN纳米管/ZnO纳米颗粒异质结构（AlN/ZnO NPs）。X射线衍射（XRD）和透射电子显微镜（TEM）结果表明，在非晶和多晶AlN壳层的内表面分别生长了ZnO纳米管和纳米颗粒。给出了不同AlN/ZnO异质结构形成的可能生长机制。与裸ZnO纳米纤维相比，AlN/ZnO CNH显示出显着增强的紫外（UV）发射，而AlN/ZnO NPs显示出显着的可见光发射。借助经典的光学衍射效应理论，计算出纳米发光材料的外发光效率随比表面积的增大而增大。研究了AlN/ZnO异质结构中载流子限制效应和表面缺陷对PL特性的影响。此外，还对不同AlN壳层厚度的AlN/ZnO CNH的光致发光（PL）特性进行了进一步的讨论。
We have illustrated a new approach to fabricate two forms of AlN/ZnO heterostructures AlN/ZnO coaxial nanotubular heterostructures (CNHs) and AlN-nanotube/ZnO-nanoparticles heterostructures (AlN/ZnO NPs). X-ray diffraction (XRD) and transmission electron microscopy (TEM) results show that ZnO nanotubes and nanoparticels have grown on the inner surface of amorphous and polycrystalline AlN shell layer, respectively. A possible growth mechanism on the formation of different AlN/ZnO heterostructures is given. Compared with bare ZnO nanofibers, AlN/ZnO CNHs exhibited remarkable enhanced ultraviolet (UV) emission, while AlN/ZnO NPs showed significant visible emission. With the aid of classical optical diffraction effect theory, it can be calculated that nanoscale luminescent materials have a higher external luminescent efficiency with increasing surface/volume ratio. The influence of carrier confinement effect and surface defects for the PL properties is also investigated in the AlN/ZnO heterostructures. In addition, the photoluminescent (PL) properties of AlN/ZnO CNHs with various AlN shell layers thickness are further discussed.