Micropatterning of Flexible and Free Standing Polyvinylidene Difluoride (PVDF) Films for Enhanced Pyroelectric Energy Transformation
Micropatterning of Flexible and Free Standing Polyvinylidene Difluoride (PVDF) Films for Enhanced Pyroelectric Energy Transformation
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DOI：
10.1002/aenm.201401891
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发表时间：
2015-04-22
影响因子：
27.8
通讯作者：
Bowen, Chris R.
中科院分区：
文献类型：
--
作者：
Zabek, Daniel;Taylor, John;Bowen, Chris R.
为了收集热能并利用大量可用的废热，热电效应提供了将温度波动转换为可用电能的机会。在这里，微图案化的热释电体的表面，以增强热传递和实现更快和更大的温度波动，提高热释电能转换，报告。在聚偏二氟乙烯（PVDF）膜上制造部分覆盖的电极的方法被开发以调查和量化这种电极结构用于热释电能量收集的益处。微图案由一系列孔组成，这些孔使用低成本的光刻和湿法蚀刻工艺蚀刻到独立铁电PVDF膜的上部铝电极中。在红外辐射加热的应用下，证明了当与完全覆盖的电极设计相比时，对于45%的电极面积覆盖率，这样的微特征能够显著提高开路电压380%和闭路电流420%。电容测量显示恒定的电场与微特征的电极面积覆盖率低至28%。在2.8 ℃的振荡温度下，给出了66.9 μ J cm（-3）周期（-1）的特定发生器性能。
In an effort to harvest thermal energy and exploit abundantly available waste heat the pyroelectric effect offers the opportunity to convert temperature fluctuations into useable electrical energy. Here, the micropatterning of the surface of a pyroelectric in order to enhance heat transfer and achieve faster and larger temperature fluctuations, which improve pyroelectric energy transformation, is reported. Methods for the fabrication of partially covered electrodes on polyvinylidene difluoride (PVDF) films are developed to investigate and quantify the benefits of such an electrode structure for pyroelectric energy harvesting. The micropattern consists of an array of holes that are etched into the upper aluminum electrodes of free standing ferroelectric PVDF films using a low cost photolithography and wet etching process. Under the application of infrared radiation heating, it is demonstrated that such microfeatures are able to significantly improve the open circuit voltage by 380% and the closed circuit current by 420% for an electrode area coverage of 45% when compared to a fully covered electrode design. Capacitance measurements show constant electric fields with microfeatures for electrode area coverages as low as 28%. A specific generator performance of 66.9 mu J cm(-3) cycle(-1) is presented at oscillation temperatures of 2.8 degrees C.