Journal ArticleDOI
Voltage Dependence of Activation Energy for Multilayer Ceramic Capacitors
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TLDR
In this article, the grain boundary potential barrier may offer a major source of impedance to leakage current in multilayer ceramic capacitors, and its decrease may result in device failure.Abstract:
Current-voltage and activation energy measurements can be used to probe grain boundary potential barriers. A common type of activation energy for Current conduction in a polycrystalline material is that due to the grain boundary potential barrier. Activation energy can be related directly to grain boundary barrier height. The height of this barrier depends on occupation of grain boundary states. Its decrease with applied voltage accounts for the superohmic current-voltage behavior of polycrystalline silicon and of ZnO varistors. It also accounts for positive temperature coefficient device behavior. A similar voltage dependence is reported here for barrier layer and COG type capacitors, where activation energies decrease from 0.99 to 0.44 eV and from 1.61 to 0.90 eV, respectively. Such decreases are not seen for X7R devices, even though currents are superohmic. Several mechanisms account for this. It is concluded that the grain boundary potential barrier may offer a major source of impedance to leakage current in multilayer ceramic capacitors, and its decrease may result in device failure.read more
Citations
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Journal ArticleDOI
Electrical Conduction Mechanisms of Barium-Titanate-Based Thick-Film Capacitors
In Yoo,L. Burton,F. Stephenson +2 more
TL;DR: In this article, the leakage current of thin-film capacitors made from Ag/Pd thick-film conducting paste and high K dielectric has been studied. And the degradation of high K (cong 500) barium-titanate-based thick-filtered capacitors was studied.
Journal ArticleDOI
Charge Carriers and Time Dependent Currents in BaTiO 3 -Based Ceramic
TL;DR: In this article, a quantitative model based on ionic movement is presented to account for leakage currents that increase exponentially with time, indicating that grain boundary impedance may be present in some cases and not others.
Proceedings ArticleDOI
Accelerated life tests of ceramic capacitors
B.M. Mogilevski,G.A. Shirn +1 more
TL;DR: In this article, multilayer capacitors prepared from three different ceramics were tested under highly accelerated conditions of both voltage and temperature, and three types of breakdown were encountered: avalanche, fast thermal degradation, and diffusion or wearout.
Proceedings ArticleDOI
A low inductance capacitor technology
J.M. Oberschmidt,J.N. Humenik +1 more
TL;DR: In this article, a multilayer ceramic capacitor that combines thick-film and thin-film processing techniques to produce a part with extremely low inductance, low resistance, and high capacitance in a reliable structure is presented.
Journal ArticleDOI
The Resistance of Grain Boundaries in BaTiO 3 -Based Ceramic
S. Villamil,Hee Lee,L. Burton +2 more
TL;DR: In this paper, the grain boundary (GB) resistance in BaTiO 3-based capacitated capacitors has been investigated in terms of grain and GB contributions, and it has been shown that grain curvature, along with carrier depletion in the grains, can result in significant reductions in GB barrier height and hence resistance.
References
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Journal ArticleDOI
Resistivity Anomaly in Doped Barium Titanate
TL;DR: In this article, the authors reexamined the barrier-layer model to explain the anomalous increase in resistivity that occurs in doped BaTiO3 in the light of data obtained from more recent experiments.
Journal ArticleDOI
Grain boundaries in semiconductors
TL;DR: In this article, a review of the available experimental and theoretical understanding on the structure and electronic properties of grain boundaries in semiconducting materials is presented, where high-resolution electron microscope images of interfaces are interpreted within the framework of the structural unit model of grain boundary, and the electronic properties are discussed with relation to the popular symmetric Schottky barrier model for charge trapping and potential barrier formation.
Journal ArticleDOI
Theory of conduction in ZnO varistors
TL;DR: In this article, a theory was presented which quantitatively accounts for the important features of conduction in ZnO-based metaloxide varistors, which predicts a varistor breakdown voltage of 3.2 V/grain boundary for n0=1017 carriers' cm−3 and T=300 K.
Journal ArticleDOI
The dc voltage dependence of semiconductor grain‐boundary resistance
G. E. Pike,C. H. Seager +1 more
TL;DR: In this article, a model is developed to describe the potential barriers which often occur at grain boundaries in polycrystalline semiconductors, where the resistance of such materials is determined by thermionic emission over these barriers.