期刊
ACS NANO
卷 8, 期 4, 页码 3829-3835出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn500598d
关键词
silicon; nanowire; kinking; defects; surface; hydrogen
类别
资金
- National Science Foundation (CBET) [1133563]
- ORNL's Shared Research Equipment (ShaRE) User Program
- Office of Basic Energy Sciences, the U.S. Department of Energy
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1133563] Funding Source: National Science Foundation
Semiconductor nanowire kinking superstructures, particularly those with long-range structural coherence, remain difficult to fabricate. Here, we combine high-resolution electron microscopy with operand infrared spectroscopy to show why this is the case for Si nanowires and, in doing so, reveal the interplay between defect propagation and surface chemistry during < 211 > -> < 111 > and < 211 > -> < 211 > kinking. Our experiments show that adsorbed hydrogen atoms are responsible for selecting < 211 >-oriented growth and indicate that a twin boundary imparts structural coherence. The twin boundary, only continuous at < 211 > -> < 211 > kinks, reduces the symmetry of the trijunction and limits the number of degenerate directions available to the nanowire. These findings constitute a general approach for rationally engineering kinking superstructures and also provide important insight into the role of surface chemical bonding during vapor-liquid-solid synthesis.
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