Electrode Shape Optimization for Robust Interface Between Ultra thin Film and Metal Electrode

Highly flexible and low-damage electronic devices can be realized using nanosheets, which are 101 to 103-nm thick polymer films that exhibit excellent flexibility and self-adhesiveness. However, flexible electronic devices using nanosheets suffer from breaking around the connector electrodes under tensile load. This paper presents electrode shapes with multiple holes to increase the circumferences and reduce the stress. By experimentally optimizing the electrode shapes, the stretch tolerance was improved by 7.5 times (4.0 N). Furthermore, the flexibility and robustness of the nanosheet devices were demonstrated by attaching them to the human skin and plant leaves without adhesives. Our flexible, low-damage, and robust nanosheet devices can expand the applications of electronic devices, such as long-term continuous healthcare monitoring, photodynamic cancer therapy, and observation of transpiration in plants.