Mechanisms Determining the Structure of Gold-Catalyzed GaAs Nanowires Studied by in Situ X-ray Diffraction
Mechanisms Determining the Structure of Gold-Catalyzed GaAs Nanowires Studied by in Situ X-ray Diffraction
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DOI：
10.1021/acs.cgd.5b00915
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发表时间：
2015-09
影响因子：
3.8
通讯作者：
M. Takahasi;M. Kozu;T. Sasaki;Wen Hu
中科院分区：
文献类型：
--
作者：
M. Takahasi;M. Kozu;T. Sasaki;Wen Hu
通过原位 X 射线衍射研究了 GaAs 纳米线生长过程中多型性的演变。发现纳米线的生长从闪锌矿结构的形成开始，随后是纤锌矿结构的生长。基于逐层成核模型的模拟很好地再现了生长过程。测量结果和模拟结果之间的良好一致性证实，与保留先前结构的堆叠相比，改变晶体结构的堆叠的成核成本更高。普遍结构的转变可以通过与三相线形状相关的局部生长条件的变化来解释，而不是通过过饱和水平的变化来解释，过饱和水平在开始生长后迅速达到稳定状态。
The evolution of polytypism during GaAs nanowire growth was investigated by in situ X-ray diffraction. The growth of nanowires was found to start with the formation of zincblende structure, followed by the growth of wurtzite structure. The growth process was well reproduced by a simulation based on a layer-by-layer nucleation model. The good agreement between the measured and simulated results confirms that nucleation costs higher energy for the stackings changing the crystal structure than for those conserving the preceding structure. The transition in prevalent structure can be accounted for by the change of local growth conditions related to the shape of a triple phase line rather than by the change in supersaturation level, which quickly reaches steady state after starting growth.