Effect of oxide thickness on the low temperature (≤400℃) growth of cone-shaped silicon nanowires
- Title
- Effect of oxide thickness on the low temperature (≤400℃) growth of cone-shaped silicon nanowires
- Author
- 이정호
- Keywords
- BUILDING-BLOCKS; SURFACES; DEVICES
- Issue Date
- 2007-08
- Publisher
- AMER INST PHYSICS
- Citation
- JOURNAL OF APPLIED PHYSICS, v. 102, No. 4, Article no. 046102
- Abstract
- Au-catalyzed cone-shaped silicon nanowires (CSiNWs) were grown at low temperature (<= 400 degrees C) using plasma-enhanced chemical vapor deposition (PECVD). Thin (<= 3 nm) Au films were evaporated and annealed on a thermally oxidized (0-80 nm) silicon substrate so as to form Au silicides, which, under a supply of SiH4, catalyzed the growth of CSiNWs. We have found that the thickness of thermally grown SiO2 and silicidation annealing critically affect the growth behavior of CSiNWs based on an analysis of areal CSiNW densities. X-ray photoelectron spectroscopy (XPS) and real-time in situ ellipsometry were used to characterize the silicidation behavior of a thin Au film annealed with different oxide thicknesses. Interestingly, the optimal condition (10-nm-thick oxide), which showed a maximum areal density of CSiNWs, revealed the highest integration intensity of Au-Si-O (or Au-O-Si) bonding units rather than the Au-Si bonding, as generally expected. The Au-Si-O (or Au-O-Si) bonding is believed to transform into an Au-Si bonding unit during the dissociation of SiH4 for nanowire growth.
- URI
- https://aip.scitation.org/doi/abs/10.1063/1.2769267https://repository.hanyang.ac.kr/handle/20.500.11754/106809
- ISSN
- 0021-8979
- DOI
- 10.1063/1.2769267
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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