Exploring Strategies for High Dielectric Constant and Low Loss Polymer Dielectrics
Exploring Strategies for High Dielectric Constant and Low Loss Polymer Dielectrics
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DOI：
10.1021/jz501831q
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发表时间：
2014-11-06
影响因子：
5.7
通讯作者：
Zhu, Lei
中科院分区：
文献类型：
--
作者：
Zhu, Lei
具有高介电常数、高温能力和低损耗的聚合物电容器对于诸如薄膜电容器、栅极电容器、人造肌肉和电热冷却的广泛应用是有吸引力的。不幸的是，通常观察到更高的极化或介电常数倾向于导致显著增强的介电损耗。因此，非常需要对介电聚合物的所有类型的极化和损耗机制的基本物理学进行彻底理解。在这个视角中，我们打算探讨不同类型的极化的优点和缺点。在许多方法中，偶极极化对于高介电常数和低损耗的聚合物薄膜是有希望的，如果偶极弛豫峰可以被推到千兆赫范围以上。特别是，偶极玻璃，顺电，和弛豫铁电聚合物的偶极极化的方法进行了讨论。[图片]
Polymer dielectrics having high dielectric constant, high temperature capability, and low loss are attractive for a broad range of applications such as film capacitors, gate dielectrics, artificial muscles, and electrocaloric cooling. Unfortunately, it is generally observed that higher polarization or dielectric constant tends to cause significantly enhanced dielectric loss. It is therefore highly desired that the fundamental physics of all types of polarization and loss mechanisms be thoroughly understood for dielectric polymers. In this Perspective, we intend to explore advantages and disadvantages for different types of polarization. Among a number of approaches, dipolar polarization is promising for high dielectric constant and low loss polymer dielectrics, if the dipolar relaxation peak can be pushed to above the gigahertz range. In particular, dipolar glass, paraelectric, and relaxor ferroelectric polymers are discussed for the dipolar polarization approach.[GRAPHICS]