Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires

Su Kong Chong, Chang Fu Dee, Saadah Abdul Rahman

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Silicon/zinc oxide (Si/ZnO) core-shell nanowires (NWs) were prepared on a p-type Si(111) substrate using a two-step growth process. First, indium seed-coated Si NWs (In/Si NWs) were synthesized using a plasma-assisted hot-wire chemical vapor deposition technique. This was then followed by the growth of a ZnO nanostructure shell layer using a vapor transport and condensation method. By varying the ZnO growth time from 0.5 to 2 h, different morphologies of ZnO nanostructures, such as ZnO nanoparticles, ZnO shell layer, and ZnO nanorods were grown on the In/Si NWs. The In seeds were believed to act as centers to attract the ZnO molecule vapors, further inducing the lateral growth of ZnO nanorods from the Si/ZnO core-shell NWs via a vapor-liquid-solid mechanism. The ZnO nanorods had a tendency to grow in the direction of [0001] as indicated by X-ray diffraction and high resolution transmission electron microscopy analyses. We showed that the Si/ZnO core-shell NWs exhibit a broad visible emission ranging from 400 to 750 nm due to the combination of emissions from oxygen vacancies in ZnO and In2O3 structures and nanocrystallite Si on the Si NWs. The hierarchical growth of straight ZnO nanorods on the core-shell NWs eventually reduced the defect (green) emission and enhanced the near band edge (ultraviolet) emission of the ZnO.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalNanoscale Research Letters
Volume8
Issue number1
DOIs
Publication statusPublished - 2013

Fingerprint

Zinc Oxide
Silicon oxides
Zinc oxide
silicon oxides
zinc oxides
Nanowires
Heterojunctions
Photoluminescence
nanowires
photoluminescence
Nanorods
nanorods
Vapors
vapors
Seed
seeds
Nanostructures
Indium
ultraviolet emission
Oxygen vacancies

Keywords

  • Core-shell
  • Hierarchical
  • Nanowires
  • Photoluminescence
  • Silicon
  • Zinc oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires. / Chong, Su Kong; Dee, Chang Fu; Rahman, Saadah Abdul.

In: Nanoscale Research Letters, Vol. 8, No. 1, 2013, p. 1-8.

Research output: Contribution to journalArticle

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