Shape memory polymer assisted transfer printing of large-area metal thin film

In this study, we showcase a large area metal thin film transfer printing technology, utilizing a method that employs a shape memory polymer (SMP)-based stamp with highly tunable adhesion properties. Under external thermal stimulation, SMP transitions between glassy and rubbery states, modulating viscoelastic property to enable switchable adhesion in the SMP stamp. The absence of solution-based chemical reaction makes the process contamination-free and environmentally friendly. Additionally, the repetitive use of SMP enhances its cost-effectiveness and mass production capabilities. This method has the potential to facilitate the efficient transfer of diverse thin films to both hard and flexible substrates, offering advancements in wafer-level heterogeneous integration with potential for novel applications and intricate structural designs.