Sakamoto Kosuke, Kuwae Hiroyuki, Kobayashi Naofumi, Nobori Atsuki, Shoji Shuichi, Mizuno Jun
Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
Research Organization for Nano and Life Innovation, Waseda University, 513 Waseda Tsurumaki-cho, Shinjuku, Tokyo, 162-0041, Japan.
Sci Rep. 2018 Feb 12;8(1):2825. doi: 10.1038/s41598-018-20978-x.
We developed highly bendable transparent indium tin oxide (ITO) electrodes with a mesh pattern for use in flexible electronic devices. The mesh patterns lowered tensile stress and hindered propagation of cracks. Simulations using the finite element method confirmed that the mesh patterns decreased tensile stress by over 10% because of the escaped strain to the flexible film when the electrodes were bent. The proposed patterned ITO electrodes were simply fabricated by photolithography and wet etching. The resistance increase ratio of a mesh-patterned ITO electrode after bending 1000 times was at least two orders of magnitude lower than that of a planar ITO electrode. In addition, crack propagation was stopped by the mesh pattern of the patterned ITO electrode. A mesh-patterned ITO electrode was used in a liquid-based organic light-emitting diode (OLED). The OLED displayed the same current density-voltage-luminance (J-V-L) curves before and after bending 100 times. These results indicate that the developed mesh-patterned ITO electrodes are attractive for use in flexible electronic devices.
我们开发了具有网状图案的高柔韧性透明氧化铟锡（ITO）电极，用于柔性电子设备。网状图案降低了拉伸应力并阻碍了裂纹的扩展。使用有限元方法进行的模拟证实，由于电极弯曲时应变释放到柔性薄膜上，网状图案使拉伸应力降低了10%以上。所提出的图案化ITO电极通过光刻和湿法蚀刻即可简单制备。经过1000次弯曲后，网状图案化ITO电极的电阻增加率比平面ITO电极至少低两个数量级。此外，图案化ITO电极的网状图案阻止了裂纹的扩展。一种网状图案化ITO电极被用于基于液体的有机发光二极管（OLED）中。该OLED在100次弯曲前后显示出相同的电流密度-电压-亮度（J-V-L）曲线。这些结果表明，所开发的网状图案化ITO电极在柔性电子设备中具有吸引力。
