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Optical characterization of ZnO nanopillars on Si and macroporous periodic Si structure
University of Federal Reconcavo Bahia, Brazil University of Federal Bahia, Brazil .
University of Federal Bahia, Brazil .
Royal Institute Technology, Sweden .
Royal Institute Technology, Sweden University of Oslo, Norway .
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2012 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 111, no 12, 123527- p.Article in journal (Refereed) Published
Abstract [en]

ZnO nanopillars were successfully grown using both the vapor-liquid-solid and the aqueous chemical growth methods on different substrates, such as quartz, n-, and p-type non-porous Si wafer (flat) and microporous periodic Si structure (MPSiS). Scanning electron microscopy was employed to compare sample morphologies. The absorption was calculated employing the GW(0) method, based on the local density approximation, and with the projector augmented wave approach. Experiment and theory show a reasonable agreement when the shape of the optical absorption is considered. The measured absorption of ZnO nanopillars, on different substrates, is lower than that observed for ZnO films on quartz substrate, in the energy gap spectral range. A strong effect of MPSiS substrates on ZnO nanopillar properties is observed. The photoluminescence technique was also employed as an optical characterization.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2012. Vol. 111, no 12, 123527- p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-79701DOI: 10.1063/1.4729260ISI: 000305832100050OAI: diva2:544095
Available from: 2012-08-13 Created: 2012-08-13 Last updated: 2014-01-15

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Nur, OmerWillander, Magnus
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