Structural and optical properties of single-crystalline ZnO nanorods grown on silicon by thermal evaporation

A. Umar, B. Karunagaran, E. K. Suh, Y. B. Hahn

Research output: Contribution to journalArticlepeer-review

210 Citations (Scopus)

Abstract

The growth of perfectly hexagonal-shaped ZnO nanorods, with Zn-terminated (0001) facets bounded with surfaces, has been performed on nickel-coated Si(100) substrate via thermal evaporation using metallic zinc powder and oxygen. Detailed structural investigations confirmed that the synthesized nanorods are single crystalline with the wurtzite hexagonal phase and preferentially grow along the c-axis direction. Raman spectra of the as-grown ZnO nanorods showed an optical-phonon E2 mode at 438 cm-1, indicating that as-grown nanostructures are in good crystallinity with the wurtzite hexagonal phase. The ZnO nanorods were found to show strong band edge emission with very weak or no deep-level emission, as shown by photoluminescence measurements. The clear observation of free excitons at low temperatures (13-50 K) indicates that the as-grown ZnO nanorods are of high quality.

Original languageEnglish
Article number013
Pages (from-to)4072-4077
Number of pages6
JournalNanotechnology
Volume17
Issue number16
DOIs
Publication statusPublished - 28 Aug 2006

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