101. Twin formation in sputter-grown ZnO∕Al2O3(0001) epitaxial film: A real time x-ray scattering study
- Author
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T. Wojtowicz, Yongju Kwon, Joseph Kioseoglou, G. Nouet, I.W. Kim, Jae-mock Yi, P. Ruterana, and Jung Ho Je
- Subjects
Materials science ,Condensed matter physics ,Scattering ,Crystal growth ,Surfaces and Interfaces ,Sputter deposition ,Condensed Matter Physics ,Epitaxy ,Surfaces, Coatings and Films ,Crystallography ,Transmission electron microscopy ,Stress relaxation ,Thin film ,Crystal twinning - Abstract
Twin formation and strain evolution in highly mismatched sputter-grown ZnO∕Al2O3(0001) hereroepitaxial films were investigated using real time synchrotron x-ray scattering measurements and high resolution electron microscopy (HREM). We reveal the existence of a critical thickness at which the twin of the 30° rotated domains starts to nucleate within the ZnO films, followed by gradual strain relaxation. Twin growth above the critical thickness stops as the strain almost fully relaxes. A HREM image shows that the twin nucleates 5–10nm away from the interface as isolated domains, not as types of layers. more...
- Published
- 2004
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