Ferroelectric Polarization Dependent Interactions at Pd-LiNbO3(0001) Interfaces

A combination of Auger electron spectroscopy and temperature-programed desorption was used to characterize the growth and interaction of Pd films with positively and negatively terminated ferroelectric LiNbO3(0001) surfaces. The growth mode of vapor-deposited Pd layers at 300 K was found to be dependent on the direction of the ferroelectric polarization with layer-by-layer growth occurring on the negative (c−) surface and particle formation occurring on the positive (c+) surface. The Pd metal layers were also found to be more thermally stable on the c− surface relative to the c+ surface. These results provide another example of how the polarization orientation in ferroelectric materials affects adsorption and reaction on their exposed surfaces. Disciplines Engineering | Materials Science and Engineering Comments Suggested Citation: Zhao, M.H., Bonnell, D.A. and Vohs, J.M. (2009). "Ferroelectric polarization dependent interactions at PdLiNbO3(0001) interfaces." Journal of Vacuum Science and Technology A. Vol. 27(6). Copyright 2009 American Vacuum Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Vacuum Society. The following article appeared in Journal of Vacuum Science and Technology. and may be found at http://dx.doi.org/10.1116/1.3248268. This journal article is available at ScholarlyCommons: http://repository.upenn.edu/mse_papers/191 Ferroelectric polarization dependent interactions at Pd–LiNbO3„0001... interfaces Mosha H. Zhao Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Dawn A. Bonnell Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 John M. Vohs Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Received 24 July 2009; accepted 21 September 2009; published 22 October 2009 A combination of Auger electron spectroscopy and temperature-programed desorption was used to characterize the growth and interaction of Pd films with positively and negatively terminated ferroelectric LiNbO3 0001 surfaces. The growth mode of vapor-deposited Pd layers at 300 K was found to be dependent on the direction of the ferroelectric polarization with layer-by-layer growth occurring on the negative c− surface and particle formation occurring on the positive c+ surface. The Pd metal layers were also found to be more thermally stable on the c− surface relative to the c+ surface. These results provide another example of how the polarization orientation in ferroelectric materials affects adsorption and reaction on their exposed surfaces. © 2009 American Vacuum Society. DOI: 10.1116/1.3248268