Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 48, Pages 54230-54240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c18951
Keywords
laser lift-off; laser ablation; interfacial peeling; hydrodynamic spallation; flexible electronics
Funding
- National Natural Science Foundation of China [51635007, 51925503]
- Hubei province technology innovation special projects [2017AAA002]
- Program for HUST Academic Frontier Youth Team
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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.
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