Document Type
Article
Original Publication Date
2009
Journal/Book/Conference Title
Journal of Applied Physics
Volume
105
Issue
11
DOI of Original Publication
10.1063/1.3132799
Date of Submission
November 2015
Abstract
We have used conducting atomic force microscopy (CAFM) to study the morphology and electronic behavior of as-received and air-annealed (0001) Zn- and (0001¯) O-polar surfaces of bulk ZnO. Both polar surfaces exhibit relatively flat morphologies prior to annealing, which rearrange to form well-defined steps upon annealing in air at 1050 °C for 1 h. Long-term exposure to air results in surface layer pitting and the destruction of steps for both the as-received and air-annealed (0001¯)surfaces, indicating its enhanced reactivity relative to the (0001) surface. CAFM I-V spectra for polar surfaces are similar and indicate Ohmic to rectifying behavior that depends on the maximum applied ramp voltage, where higher voltages result in more conducting behavior. These data and force-displacement curves suggest the presence of a physisorbed H2O layer, which is removed at higher voltages and results in higher conduction.
Rights
Moore, J. C., Kenny, S. M., & Baird, C. S., et al. Electronic behavior of the Zn- and O-polar ZnO surfaces studied using conductive atomic force microscopy. Journal of Applied Physics, 105, 116102 (2009). Copyright © 2009 American Institute of Physics.
Is Part Of
VCU Physics Publications
Comments
Originally published at http://dx.doi.org/10.1063/1.3132799