Member, The American Ceramic Society
Electrode Defects in Multilayer Capacitors Part I: Modeling the Effect of Electrode Roughness and Porosity on Electric Field Enhancement and Leakage Current
Article first published online: 2 AUG 2011
© 2011 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 1, pages 257–263, January 2012
How to Cite
Samantaray, M. M., Gurav, A., Dickey, E. C., Randall, C. A. (2012), Electrode Defects in Multilayer Capacitors Part I: Modeling the Effect of Electrode Roughness and Porosity on Electric Field Enhancement and Leakage Current. Journal of the American Ceramic Society, 95: 257–263. doi: 10.1111/j.1551-2916.2011.04769.x
The authors acknowledge the support by National Science Foundation GOALI project, DMR 0606352. The Materials Research Institute at Pennsylvania State University supported this publication.
- Issue published online: 3 JAN 2012
- Article first published online: 2 AUG 2011
- Manuscript Accepted: 1 JUL 2011
- Manuscript Received: 10 MAY 2011
- National Science Foundation GOALI. Grant Number: DMR 0606352
- The Materials Research Institute at Pennsylvania State University
Multilayer capacitors consist of multiple, often hundreds of capacitors connected in parallel to maximize volumetric efficiency. As the dielectric and electrode layer thicknesses are scaled down, microstructural imperfections become increasingly influential on the device electrical performance. Specifically, the presence of nonplanar and discontinuous electrodes can lead to local field enhancements while the relative morphologies of two adjacent electrodes determine variations in the local dielectric thickness. To study the effects of electrode morphologies, an analytical approach is taken to calculate the field enhancement and leakage current with respect to an ideal parallel-plate capacitor. It is shown that the electrode roughness causes the leakage current to increase with respect to that of the ideal flat parallel-plate capacitor. To further include the effects of local curvature on electric field enhancements, finite element methods are used to calculate field distributions within capacitor structures containing rough interfaces and porosity. In these simulations, the effects of electrode pore diameters, dielectric layer thickness, and the amplitude and wavelength of the electrode roughness are studied.