Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 38, Issue 1, Pages 79-84Publisher
SPRINGER
DOI: 10.1007/s10971-006-5731-9
Keywords
ZnO; nanorod array; electric field assisted nucleation; aqueous solution growth
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This paper reports direct growth of [001] ZnO nanorod arrays on ITO substrate from aqueous solution with electric field assisted nucleation, followed with thermal annealing. X-ray diffraction analyses revealed that nanorods have wurtzite crystal structure. The diameter of ZnO nanorods was 60-300 nm and the length was up to 2.5 mu m depending on the growth condition. Photoluminescence spectra showed a broad emission band spreading from 500 to 870 nm, which suggests that ZnO nanorods have a high density of oxygen interstitials. Low and nonlinear electrical conductivity of ZnO nanorod array was observed, which was ascribed to non-ohmic contact between top electrode and ZnO nanorods and the low concentration of oxygen vacancies.
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