Laminated Structure of Al2O3 and TiO2 for Enhancing Performance of Reverse Electrowetting-On-Dielectric Energy Harvesting
Laminated Structure of Al2O3 and TiO2 for Enhancing Performance of Reverse Electrowetting-On-Dielectric Energy Harvesting
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Al2O3 和 TiO2 的层状结构可增强反电润湿电介质能量收集的性能
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Young‐Beom Kim
中科院分区：
文献类型：
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作者：
Hwichul Yang;Hojae Lee;Yonghyun Lim;Maria Christy;Young‐Beom Kim
电介质上反向电润湿（REWOD）是一种新型的能量收集技术，由于其即使在少量干扰下也能获得高功率输出而受到相当大的关注。为了提高REWOD的输出功率，系统中的介电层需要高电容。然而，在这种高k电介质材料中，电流泄漏是不可避免的。在这项工作中，应用高k电介质材料TiO 2已被研究沿着与一种新的泄漏阻挡层Al 2 O 3，作为一个叠层，以尽量减少电流泄漏和最大限度地提高功率输出。正如预期的那样，与TiO 2或Al 2 O3单层相比，TiO 2和Al 2 O3的层状结构分别表现出降低的漏电流和相对较高的电容。由于电能是通过液滴和多层介电膜的相互作用产生的，能量收集性能相对于与导电液滴接触的顶表面材料显示出关于电流产生的不同行为。总体而言，层压REWOD能量收集系统在低偏置电压下产生了15.36 mW cm-2的增强功率密度。
Reverse electrowetting-on-dielectric (REWOD) is a novel energy harvesting technique that has been gaining considerable amount of attention owing to its high power output even with the small amount of disturbance. To enhance the output power of REWOD, the dielectric layers in the system require a high capacitance. Nevertheless, current leakage is inevitable in such high-k dielectric materials. In this work, the application of a high-k dielectric material TiO 2 has been investigated along with a new leakage barrier layer Al 2 O 3 that acts as a lamination, in order to minimize the current leakage and maximize the power output. As expected, the laminated structure with TiO 2 and Al 2 O 3 exhibited reduced current leakage and relatively high capacitance compared to the single layer of TiO 2 or Al 2 O 3 , respectively. As the electrical energy is generated through the interaction of liquid droplets and the multilayered dielectric film, the energy-harvesting performance displayed different behavior about current generation with respect to the top surface material that is in contact with the conductive droplet. Overall, the laminated REWOD energy harvesting system produced an enhanced power density of 15.36 mW cm −2 at a low bias voltage.