【摘要】 可延展柔性电子器件可共形贴合在复杂曲面的弹性物体表面,在生物集成电子、共形天线等领域具有广泛应用。岛-桥结构设计提高了柔性电子器件的可拉伸能力,桥结构通常设计成U形互连结构,通过有限元计算发现,在拉伸过程中该结构呈现非常复杂的变形行为:桥结构经历纯弯、整体受拉,最后进入塑性变形阶段。桥结构的线宽和结构长跨比对结构延展性影响显著,计算结果表明:宽度减小可以提高结构拉伸能力,但是宽度过小,结构拉伸能力急剧降低;当结构宽度较大时,结构断裂前局部出现平面外屈曲;而跨度增加普遍明显地提高了结构的拉伸能力,但会使结构尺寸变大;长跨比小于1.4时,U形互连结构的延展性随长跨比的增加而增大。通过U形互连结构的变形机理研究可以优化互连结构的结构参数,提高柔性电子器件的延展性。更多还原

【Abstract】 Stretchable electronic devices are widely used in applications in biomedical devices and conformal antennas that require intimate integration with complicated surfaces of elastomers. The island-bridge layout improves the stretchability in practical flexible electronic devices,among which U-patterned interconnects have been designed to enable devices’ repeatable stretchability up to 40%. While the island-bridge-substrate structure is stretched,complex deformation is observed by use of FEM. These structures suffer unilateral tension and compression,global tension and plastic deformation. The width and length \ spacing ratio significantly influent the stretchability. The results demonstrate that reduction of width enhances the stretchability,while degrades it when width becomes too small. When width is large,out-plane buckling appears before cracks occur. Spacing always increases the stretchability while the dimensions would become large. When the length/spacing ratio is smaller than 1. 4,the stretchability increases as it grows. Therefore,study for the deformation mechanism of U-patterned interconnects could optimize its geometry parameters and improve the stretchability of flexible electronic devices.更多还原