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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The analysis of isothermal current in terms of charge injection or extraction at the metal-dielectric contact
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The analysis of isothermal current in terms of charge injection or extraction at the metal-dielectric contact

机译：根据金属-电介质接触处的电荷注入或析出等温电流的分析

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摘要

The measured isothermal charging and discharging currents are analyzed either in terms of polarization mechanisms or in terms of charge injection/extraction at the metal-dielectric interface and the conduction current through the dielectric material. We propose to measure the open-circuit isothermal charging and discharging currents just to overpass the difficulties related to the analysis of the conduction mechanisms through the dielectric materials. Besides a polarization current, there is a current related with charge injection or extraction at the metal-dielectric contact and a reverse current related to the charge trapped into the superficial trap states of the dielectric and that can jump at the interface in a reverse way. By fitting the experimental data, two important parameters can be determined (i) the highest value of the relaxation time for the polarization mechanisms still involved into the transient current and (ii) the height W-0 of the potential barrier at the metal-dielectric interface immediately after the step voltage is applied. Only the initial part of the measured isothermal charging or discharging current can be used to obtain information about the polarization processes. By transforming the time-domain data into the frequency domain, a maximum for the imaginary part of the dielectric permittivity is obtained, in good agreement with the data obtained from AC dielectric measurements and the finally thermally stimulated discharge current measurements.
机译：根据极化机理或根据金属-电介质界面处的电荷注入/提取以及通过电介质材料的传导电流来分析测得的等温充电和放电电流。我们建议测量开路等温充电和放电电流，以克服与通过介电材料进行传导机理分析有关的困难。除了极化电流外，还存在与电荷在金属-电介质接触处注入或提取有关的电流，以及与电荷捕获到电介质的表面陷阱状态的电荷有关的反向电流，并且该反向电流可以以相反的方式在界面处跳跃。通过拟合实验数据，可以确定两个重要参数：（i）仍参与瞬态电流的极化机制的弛豫时间的最大值，以及（ii）金属电介质处势垒的高度W-0施加阶跃电压后立即连接。只能将测得的等温充电或放电电流的初始部分用于获取有关极化过程的信息。通过将时域数据转换为频域，可以获得介电常数的虚部的最大值，这与从交流电介质测量以及最终热激励的放电电流测量获得的数据非常吻合。

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