Anisotropic Properties Of Periodically Polarity-Inverted Zinc Oxide Structures

We report on the anisotropic structural properties of periodically polarity-inverted (PPI) ZnO structures grown on patterned templates. The etching and growth rates along < 11 (2) over bar0 > direction of ZnO structures are higher than those of < 10 (1) over bar0 > direction of ZnO films. From the strain evaluation by Raman spectroscopy, compressive strains are observed in all PPI ZnO samples with different stripe pattern size and the smaller pattern size is more effective to residual stress relaxation. The detailed structures at transition region show relationship with the anisotropic crystal quality. (C) 2010 American Institute of Physics. [doi:10.1063/1.3436575]