Liquid Metal based Stretchable Room Temperature Soldering Sticker Patch for Stretchable Electronics Integration

摘要

Researchers are eagerly developing various stretchable conductors tofabricate devices for next-generation electronics. Most of the major problemsin stretchable electronics happen at the connection between rigid and softparts and the development of reliable soldering material is a major hurdle instretchable electronics. Though there are attempts to devise new solderingprocesses for integrating chips and stretchable conductors, they still possesslimitations such as mechanical stability, mass production, sophisticatedprocesses, and restricted candidates for conductors and substrates. Here, thisstudy presents a room-temperature universal stretchable sticker-like solderingprocess that can stretchably solder multiple spots at once and directlyfabricates a stretchable device in an in situ manner while a target conductor isinstalled on one’s body. The solder developed in this research possesses highconductivity with a unique freestanding feature enabling the process. It can beelongated when directly positioned between a rigid chip and a rigid conductor,demonstrating its extraordinary stretchability. It is expected that this simplebut unique stretchable soldering technique utilizing the invented solder willallow the integration of functional stretchable conductors with highlyadvanced rigid chips for next-generation stretchable electronics.