Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Capillary Assembly of Silicon Nanowires Using the Removable Topographical Patterns

  • Hong, Juree (Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Seulah (Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Sanggeun (Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University) ;
  • Seo, Jungmok (Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Taeyoon (Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University)
  • Received : 2014.07.08
  • Accepted : 2014.08.26
  • Published : 2014.10.27
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Abstract

We demonstrate a simple and effective method to accurately position silicon nanowires (Si NWs) at desirable locations using drop-casting of Si NW inks; this process is suitable for applications in nanoelectronics or nanophotonics. Si NWs were assembled into a lithographically patterned sacrificial photoresist (PR) template by means of capillary interactions at the solution interface. In this process, we varied the type of solvent of the SiNW-containing solution to investigate different assembly behaviors of Si NWs in different solvents. It was found that the assembly of Si NWs was strongly dependent on the surface energy of the solvents, which leads to different evaporation modes of the Si NW solution. After Si NW assembly, the PR template was cleanly removed by thermal decomposition or chemical dissolution and the Si NWs were transferred onto the underlying substrate, preserving its position without any damage. This method enables the precise control necessary to produce highly integrated NW assemblies on all length scales since assembly template is easily fabricated with top-down lithography and removed in a simple process after bottom-up drop-casting of NWs.

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References

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