Integrated thin film capacitors: Interfacial control and implications on fabrication and performance

被引:9
|
作者
Ramesh, S [1 ]
Huang, C [1 ]
Liang, S [1 ]
Giannelis, EP [1 ]
机构
[1] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA
关键词
D O I
10.1109/ECTC.1999.776071
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
Despite the huge potential, integral passives form less than 3% of the replaceable discrete components. A major obstacle in bridging this gap has been the absence of a wider choice of materials that would conform to stringent performance requirements. Epoxy-ceramic composite dielectrics have been investigated in recent time towards the fabrication of integral thin film capacitors due to their compatibility with processing conditions for printed wire boards (PWB). Though many investigations in recent past have focussed on the dielectric propel ties of epoxy-ceramic composites it is surprising that investigations on the interfacial effects did not receive the attention they deserve. These effects are even more pronounced in nanocomposites as the influence of the interface turns dominant with decreasing size of the dispersed ceramic phase. Functionalization of barium titanate (BTO) nanoparticles with an organic silane was shown to improve the dispersion of the particles in the epoxy matrix and hence the rheological properties. The dielectric properties of a nanocomposite with a surface modified ceramic dispersant are likely influenced in two ways (a) change in the microstructure of the composite brought about by the improved dispersibility and (b) change in the intel facial or Maxwell-Wagner-Sillars (MWS) polarization in the heterogeneous phase. Fundamental understanding of such influences is important in the design of polymer-inorganic nanocomposites. These influences were investigated in the case of epoxy as well as polyvinylidene fluoride (PVDF) matrices with a dispersion of barium titanate nanoparticles at different volume fractions. Dielectric properties such as relative permittivity and impedance were investigated with frequencies up to 10(7) HZ. The organic modification of the interface was found to significantly influence the processibility and dielectric properties.
引用
收藏
页码:99 / 104
页数:6
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