Laser-Induced Interfacial Spallation for Controllable and Versatile Delamination of Flexible Electronics

ACS Applied Materials & Interfaces
Jing BianYongAn Huang

Abstract

The control of interface status is greatly critical to release large-area, ultrathin flexible electronics from the donor wafer to achieve mechanical flexibility. This paper discovers a laser-induced interfacial spallation process for controllable and versatile delamination of polyimide (PI) films from transparent substrates and makes a comprehensive mechanism study of the controllability of interfacial delamination after laser irradiations. Microscopic observations show that backside irradiations will result in the formation of nanocavities around the PI-glass interface, enabling a significant decrease in interface adhesion. Theoretical calculations indicate that gas products generated from thermal decomposition of PI will cause hydrodynamic spallation of molten PI around the interface. The controllable spallation behavior benefits the formation/elimination of fibrous microconnections between the PI film and glass substrate. A substantial regulation of interfacial micromorphologies can achieve precise control of interface adhesion, mass production of functional nanostructures, and nondestructive peeling of ultrathin flexible devices. The results could be useful for the fabrication of flexible electronics and biomimetic surfaces.

References

Feb 13, 2003·Chemical Reviews·N BityurinT C Chong
Sep 1, 2012·Advanced Materials·Andrew CarlsonJohn A Rogers
Oct 25, 2012·Nano Letters·Yujia ZhaiSanjay K Banerjee
Nov 28, 2013·Nature Communications·Elena P IvanovaRussell J Crawford
Apr 4, 2017·Advanced Materials·Daniel J JoeKeon Jae Lee

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