Electrical breakdown and charge dynamics of Polyethylene terephthalate films

Jie Zhou, Peinan Zhou, Chao Wu, Yifei Wang, Yang Cao
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Abstract

Polyethylene terephthalate (PET) films have been used widely for capacitor application due to the high dielectric strength and low conduction loss. In this paper, we experimentally investigated the charge dynamics under the triangular voltage and temperature-dependent (TD) conduction of PET films up to the electrical breakdown using a specially designed conduction measurement setup. The charge dynamics in PET during transient voltage ramps as revealed by this setup provide implications of carrier transport with high mobility. In addition, the pre-breakdown conduction shows explicit space-charge-limited current features. The breakdown strength is stable in the temperature range from 25 to 100 °C and follows the derating process above 100°C. Also, a turning point is observed around the glass transition temperature for the nonlinear conduction onset field of PET films. The understanding of charged carrier behaviors at high electric fields can provide insights into the breakdown mechanism of dielectrics and the exploration of high-performance polymers.
聚对苯二甲酸乙二醇酯薄膜的电击穿和电荷动力学
聚对苯二甲酸乙二醇酯(PET)薄膜具有高介电强度和低传导损耗等优点,在电容器领域得到了广泛的应用。在本文中,我们实验研究了三角形电压和温度依赖(TD)下PET薄膜的电荷动力学,直到电击穿,使用专门设计的传导测量装置。该装置揭示了瞬态电压坡降期间PET中的电荷动力学,提供了高迁移率载流子输运的含义。此外,击穿前导通表现出明显的空间电荷限制电流特征。击穿强度在25 ~ 100℃范围内稳定,在100℃以上有降额过程。此外,在PET薄膜的非线性导起始场的玻璃化转变温度附近也观察到一个转折点。对带电载流子在高电场作用下的行为的理解,有助于深入了解电介质的击穿机理和高性能聚合物的探索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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