Site-Specific Design of Cone-Shaped Si Nanowires by Exploiting Nanoscale Surface Diffusion for Optimal Photoabsorption
- Title
- Site-Specific Design of Cone-Shaped Si Nanowires by Exploiting Nanoscale Surface Diffusion for Optimal Photoabsorption
- Author
- 박원일
- Keywords
- Si nanowires; nanocones; site-specific control; antireflection effect; nanoscale diffusion
- Issue Date
- 2011-09
- Publisher
- AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
- Citation
- CHEMISTRY OF MATERIALS, Vol.23, No.17 [2011], p3902-3906
- Abstract
- In this study, we introduce a new strategy to control silicon nanowire (SiNW) morphology (cone shape and cylindrical shape) by exploiting adatom diffusion at the nanostructured surface. In our approach, by using chemical treatment with a mixture of HF and H(2)SO(4) acids, ordinary flat Si substrates were changed to nanoscale-faceted, corrugated surfaces, accompanied by a transition from a hydrophobic to hydrophilic surface. These nanostructured surfaces enhanced the surface diffusion, which eventually stimulated radial growth to change the NW morphology from a cylindrical shape to a cone shape with a sharp tip. By using site-specific chemical treatment, both cone-shaped and cylindrical-shaped SiNWs could be achieved selectively on the same chip under the same conditions. Furthermore, these shape-controlled SiNWs demonstrated an outstanding antireflection effect over a broad range of wavelengths, as determined by optical measurements and finite-difference time-domain modeling.
- URI
- https://pubs.acs.org/doi/abs/10.1021/cm201188zhttps://repository.hanyang.ac.kr/handle/20.500.11754/74721
- ISSN
- 0897-4756
- DOI
- 10.1021/cm201188z
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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