Multi-functionalization of silicon by nanoparticles through "plug and play" approach

K. Prabhakaran, K. V.P.M. Shafi, A. Ulman, T. Ogino

Research output: Contribution to journalConference articlepeer-review

Abstract

In this paper, we demonstrate a "Plug and Play" approach, whereby externally synthesized nanoparticles of desired functions and size are incorporated into the semiconductor, followed by the manipulation of surface chemical bonds in order to achieve multiple functionality. Sonochemically synthesised Fe2O3 nanoparticles were introduced onto device quality Si wafers. On annealing the particle-treated Si wafer in ultra high vacuum, oxygen changes the bonding partner from Fe to Si and desorb as SiO at ∼ 760°C, leading to the formation of uniform sized Fe nanoparticles (size ∼6-8 nm) on the surface and the sample shows ferromagnetic behaviour. More importantly, the particle treated Si exhibits light emission at wavelengths 1.57, 1.67 and 1.65 microns (full width at half maximum ∼ 20 meV). Emission in this wavelength range is crucial for optical communications and is highly desired from a Si based material. Further, oxidation of this material leads to the formation of a selective capping layer of SiO2. Thus, by manipulating the surface chemical bonds,we are able to introduce optical, magnetic, metallic and insulating functions to Si. Additionally, the particles exhibits self-assembly on a patterned Si surface. We believe that this approach is universal and the material developed here is compatible with the planar Si technology, bringing us closer or realization of Si based monolithic electronics.

Original languageEnglish (US)
Pages (from-to)141-146
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume703
StatePublished - 2002
EventNanophase and Nanocomposite Materials IV - Boston, MA, United States
Duration: Nov 26 2001Nov 29 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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