Transfer-printing of PEDOT:PSS films for flexible and stretchable electronics

The conductive polymer poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) is of great interest for a variety of applications in flexible and stretchable electronics. However, to advance novel applications on appropriate substrates, innovative and reliable methods for processing conductive polymers are still needed. Here, we present a fast, dependable, and easy PEDOT:PSS transfer-printing method on flexible, transparent, and biodegradable polyvinyl alcohol (PVA) targets. In contrast to previous work, this method neither depends on acid nor doping treatments nor surface soaking treatments. Furthermore, our approach is compatible with common strategies to induce stretchability and increase the conductivity of PEDOT:PSS. Key to this method is the chemical engineering of hydrogen bonds. To adjust the mechanical properties, glycerol is incorporated in varying amounts into the PVA targets. Additionally, a novel methodology to pattern PEDOT:PSS thin films is established, using an oxygen-plasma treatment. These patterned films can be transfer-printed, employing the herein present process. Lastly, the water-soluble targets allow for environmental-friendly decomposition.