Point Defect Configurations of Supersaturated Au Atoms Inside Si Nanowires

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• 作者：Sang Ho Oh ; Klaus van Benthem ; Sergio I. Molina ; Albina Y. Borisevich ; Weidong Luo ; Peter Werner ; Nikolai D. Zakharov ; Dhananjay Kumar ; Sokrates T. Pantelides ; Stephen J. Pennycook
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：8
• 期：4
• 页码：1016 - 1019
• 全文大小：1190K
• 年卷期：v.8,no.4(April 2008)
• ISSN：1530-6992

文摘

Aberration-corrected scanning transmission electron microscopy (STEM) is used to reveal individual Au atom configurations inside Si nanowires grown by Au-catalyzed vapor–liquid–solid (VLS) molecular beam epitaxy (MBE). We identify a substitutional and three distinct interstitial configurations, one of which has not been previously identified. We confirm the stability of the observed point defect configurations by density functional theory (DFT) calculations. The observed number densities of the various configurations are in accord with their calculated formation energies. The concentration of Au atoms is larger than the solubility limit, but the effect may be caused by the STEM beam.