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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Space charge profiles in low density polyethylene samples containing a permittivity/conductivity gradient
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Space charge profiles in low density polyethylene samples containing a permittivity/conductivity gradient

机译：包含介电常数/电导率梯度的低密度聚乙烯样品中的空间电荷分布

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Laser induced pressure pulse space charge measurements were made on 1.5 mm thick plaques of high purity low density polyethylene equipped with vacuum-evaporated aluminium electrodes. Temperature differences up to 20 degreesC were maintained across the samples, which were subjected to dc fields up to 1.5 x 10(7) V m(-1). Current density was also measured as a function of temperature and field. Space charge due exclusively to the temperature gradient was detected, with density of order 0.01 C m(-3). The activation energy associated with the transport of electrons through the bulk was calculated as 0.09 eV. However, measurements of the temperature dependence of the current in isothermal samples yielded activation energies in the range 0.9-1.3 eV. It is deduced that most of this larger activation energy is associated with charge injection at the electrodes. Electron mobilities not less than 2 x 10(-12) m(2) V-1 s(-1) were inferred by combining the space charge and current density measurements. [References: 16]
机译：在配备有真空蒸发铝电极的1.5毫米厚的高纯度低密度聚乙烯板片上进行激光感应压力脉冲空间电荷测量。整个样品的温差保持在20摄氏度，这些样品经受的直流磁场最大为1.5 x 10（7）V m（-1）。还测量了电流密度与温度和电场的关系。仅由于温度梯度而检测到的空间电荷，密度约为0.01 C m（-3）。计算出与电子通过主体的传输相关的活化能为0.09 eV。但是，对等温样品中电流的温度依赖性进行测量得出的活化能为0.9-1.3 eV。可以推断出，这种较大的活化能大部分与电极上的电荷注入有关。通过结合空间电荷和电流密度测量推断出电子迁移率不小于2 x 10（-12）m（2）V-1 s（-1）。 [参考：16]

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