Strain localization in wearable integrated electronics using dot pattern

Abstract

Sensors and actuators can now achieve high levels of stretchability and functionality owning to the recent development of stretchable electronics. One main factor in creating high-performance stretchable electronics that can be adequately transferred to curved surfaces, such as human skin, is the conformal design of the island-bridge model. In island-bridge models, interconnect conductors (bridges) are the most vulnerable. Thus, it is necessary to preserve the durability and functionality of interconnect conductors under high strains. In this study, by transferring dots to the main substrate, the interconnect conductors can be protected. This causes the strain to become localized in the region between the two neighboring islands. This region is known as safe region. In the safe region, the strains bypass the other side of the stretchable electronic from the upper and lower parts. This objective was achieved using the experimental tensile test and finite element analysis. These results displayed a 4% − 9% reduction in the average strain of safe region while applying 10% − 30% strain. The design parameters were optimized with energy release rate measurement. Additionally, the interconnect conductors’ path in the safe region was optimized improving this value to at least 50% below its applied strain. This design made the stretchable electronic significantly durable while maintaining its functionality.