Investigation of intrinsic defects in core-shell structured ZnO nanocrystals
Investigation of intrinsic defects in core-shell structured ZnO nanocrystals
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DOI：
10.1063/1.4725478
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发表时间：
2012-06-01
影响因子：
3.2
通讯作者：
Erdem, E.
中科院分区：
文献类型：
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作者：
Parashar, S. K. S.;Murty, B. S.;Erdem, E.
采用高能球磨法制备了ZnO纳米颗粒，并通过电子顺磁共振（EPR）、阻抗谱和拉曼光谱研究了ZnO纳米颗粒的表面缺陷和芯部缺陷。我们观察到两个不同的EPR信号具有不同的g因子，g类似于2.0和类似于1.96，分别表示表面和芯上的EPR活性缺陷。使用半经验核壳模型，我们发现，足够小的纳米晶体（小于30 nm）可以显示p型字符。该模型还可以解释纳米ZnO的U-I行为的非线性的起源。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4725478]
Nanocrystalline ZnO particles were prepared using the high-energy ball milling technique and investigated with electron paramagnetic resonance (EPR), impedance, and Raman spectroscopy to reveal the origin of surface and core defects. We observed two distinct EPR signals with different g-factors, g similar to 2.0 and similar to 1.96, indicating EPR-active defects on the surface and core, respectively. Using the semi-empirical core-shell model, we identified that sufficiently small nanocrystals (below 30 nm) can show p-type character. The model can also explain the origin of the non-linearity of the U-I behaviour in nanocrystalline ZnO. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4725478]