Overview
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ABSTRACT
Dielectric materials are present in all areas of electrical engineering, microelectronics and telecommunications, and their performances have made significant improvements. The understanding of the various polarization mechanisms (ionic, electronic or orientation) allows for achieving higher values of dielectric permittivity. A widely used passive component, the capacitor is even comparable to a power source when its capacity is very high. Two trends are emerging: integration made possible by its reduced size and increased functionalities.
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Read the articleAUTHORS
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Mario MAGLIONE: Research Director ICMCB (Bordeaux Institute of Condensed Matter Chemistry) CNRS
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Rodolphe DECOURT: Engineer ICMCB (Bordeaux Institute of Condensed Matter Chemistry) CNRS
INTRODUCTION
Dielectric materials are mainly used in the manufacture of capacitors in all areas of electrical engineering, microelectronics and telecommunications. Some dielectric materials also possess properties (ferroelectric, piezoelectric, pyroelectric, optical) with applications in sensors, actuators and nonlinear optics.
The first optimization criterion for capacitors is their capacitance C, which can be written as :
where
is the dielectric permittivity of vacuum,
the relative dielectric constant of the material used, S the surface area of the capacitor electrodes and e the thickness separating these two electrodes. Based on equation (1), we can see that the development of new capacitors involves either finding new materials to adapt
, or modifying the geometry of the capacitor S/e. This dual strategy is currently employed in the field of microelectronics when it comes to increasing C. If the S/e geometry is fixed, we seek to replace the current dielectric material (silica SiO
2
,
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Dielectric materials
Bibliography
Websites
Paumanok http://www.paumanokgroup.com
Cornell Dubilier http://www.cde.com/appguide/
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