Catalyst-free growth of vertically aligned ZnO nanostructures arrays on periodically polarity-inverted substrate

Jinsub Park, Ki Hyun Kim, Sung Hyun Park, Euijoon Yoon, Takafumi Yao

Research output: Contribution to journalArticle

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Abstract

We report vertically aligned ZnO nanostructures grown using periodically polarity-inverted (PPI) ZnO heterostructures on (0001) Al2O 3 without the aid of a catalyst. In order to fabricate the PPI ZnO templates, the polarity control of ZnO film via in situ crystal polarity control methods using CrN and Cr2O3 buffer layers was used. Vertically aligned ZnO nanowires or nanowalls were formed only on the Zn-polar regions. The self-catalyzed process on the Zn-polar surface was most likely responsible for this selective growth. Finally, we determined the mechanism of nanowall formation on the basis of the coalescence of several nanowires in the defined area.

Original languageEnglish
Article number105001
JournalApplied Physics Express
Volume3
Issue number10
DOIs
StatePublished - 2010 Oct 1

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