Rapid Nondestructive Analysis of Threading Dislocations in Wurtzite Materials Using the Scanning Electron Microscope
Rapid Nondestructive Analysis of Threading Dislocations in Wurtzite Materials Using the Scanning Electron Microscope
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DOI：
10.1103/physrevlett.108.135503
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发表时间：
2012-03-30
影响因子：
8.6
通讯作者：
Trager-Cowan, C.
中科院分区：
文献类型：
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作者：
Naresh-Kumar, G.;Hourahine, B.;Trager-Cowan, C.
我们描述了在扫描电子显微镜中使用电子通道对比成像来快速可靠地成像和识别纤锌矿晶体结构材料中的螺纹位错（TDs）。在电子通道对比成像中，垂直td显示为具有黑白对比的斑点。我们开发了一种简单的几何程序，利用在螺旋位错、边缘位错和混合位错的黑白对比方向上观察到的差异，对两个从g矢量彼此为120度的对称等效晶体平面上获得的两个电子通道对比图像进行分析。我们的方法允许对所有td进行明确的识别，而无需将结果与通道对比度的动态模拟进行比较。
We describe the use of electron channeling contrast imaging in the scanning electron microscope to rapidly and reliably image and identify threading dislocations (TDs) in materials with the wurtzite crystal structure. In electron channeling contrast imaging, vertical TDs are revealed as spots with black-white contrast. We have developed a simple geometric procedure which exploits the differences observed in the direction of this black-white contrast for screw, edge, and mixed dislocations for two electron channeling contrast images acquired from two symmetrically equivalent crystal planes whose g vectors are at 120 degrees to each other. Our approach allows unambiguous identification of all TDs without the need to compare results with dynamical simulations of channeling contrast.