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Polarity characterization by anomalous x-ray dispersion of ZnO films and GaN lateral polar structures.
- Source :
-
Journal of Applied Physics . 2014, Vol. 115 Issue 4, p1-6. 6p. 1 Color Photograph, 1 Black and White Photograph, 3 Graphs. - Publication Year :
- 2014
-
Abstract
- We demonstrate the use of anomalous x-ray scattering of constituent cations at their absorption edge, in a conventional Bragg-Brentano diffractometer, to measure absolutely and quantitatively the polar orientation and polarity fraction of unipolar and mixed polar wurtzitic crystals. In one set of experiments, the gradual transition between c+ and c- polarity of epitaxial ZnO films on sapphire as a function of MgO buffer layer thickness is monitored quantitatively, while in a second experiment, we map the polarity of a lateral polar homojunction in GaN. The dispersion measurements are compared with piezoforce microscopy images, and we demonstrate how x-ray dispersion and scanning probe methods can provide complementary information that can discriminate between polarity fractions at a material surface and polarity fractions averaged over the film bulk. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 115
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 94302225
- Full Text :
- https://doi.org/10.1063/1.4863120