Photopatternable functional siloxane polymer based passivation layers for ultrathin flexible electronics

Abstract

Unlike the materials and designs used in conventional rigid, planar forms of electronic devices, flexible electronic devices must have mechanical properties applicable to human skin or curved bodies for application for bio-signal monitoring. Therefore, flexible passivation layer is essential to protect the electronic device from degradation or external contamination of the device as well as mechanical durability of the device in the flexible electronic device. Such a flexible passivation layer requires a material innovation capable of a solution-process and photo patterning that can be made large-area and easy to manufacture complex multi-layer at the same time. In this study, introduced a functional siloxane material used as a passivation layer material of a flexible electronic device and manufactured an ultra-thin flexible electronic device with a passivation layer composed of a siloxane material with water repellency and upconversion nanoparticle with photo-stability in water condition. Sol-gel processed photopatternable siloxane materials were applied to ultra-thin flexible electronic devices, we confirmed reliability, mechanical durability and biocompatibility of materials. We expect our functional siloxane materials to be promising materials in the passivation layer applications of large-area bio-integrated or wearable devices.