[Back]

J. Hernando-Garcia, J.L. Sànchez-Rojas, E. Iborra, A. Ababneh, U. Schmid:
"Simulation and Laser Vibrometry Characterization of Piezoelectric AIN Thin Films";
Journal of Applied Physics, Vol. 104 (2008), 053502-1 - 053502-9.

In this paper, the electric field induced deformations of sputter-deposited piezoelectric aluminum nitride thin films sandwiched between electrodes on top of a silicon substrate are studied by
numerical calculations and scanning laser interferometric measurements. In our calculations based on the finite element method, the results show the displacement of the top and bottom surfaces of
both the thin film and the substrate, for either a free or a perfectly clamped structure. The confirmation that the bottom surface of the film is deformed reveals the limitations of techniques
that only access the top surface, as well as the double-beam interferometric configuration, under specific conditions. In addition, the simulations demonstrate the dependence of the displacements on the size of the upper electrode and the contribution of the transverse piezoelectric coefficient d31 to the features of the displacement profiles. A laser scanning vibrometry technique was used to measure deformations on the top surface with subpicometer vertical resolution. By comparing thecalculated and the experimental displacement profiles, an advanced approach is discussed to obtain
accurate quantitative information of both coefficients d31 and d33. © 2008 American Institute of physics.

http://dx.doi.org/10.1063/1.2957081