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LIFT-OFF SYSTEM

The key to successful lift-off processing is ensuring that once the metal “flake” has been “lifted-off”, it is quickly removed from the possibility of ever re- adhering to the wafer surface. The process must be sufficiently energetic to leave completely clean metal edges and unmetallized surfaces. The spinning chuck ensures the dynamic removal of flakes while the pressures and solvent temperatures achievable in our tools guarantee the desired result.
LIFTOFF TOOL
p1021816
P1021770
The lift-off process, while simple in concept, becomes complex once we account for the multiplicity of metals, polymers, and substrates that a user is contending with. For that reason the tool(s) to be used in the process can vary from user to user. For most applications a hot NMP soak, followed by hot NMP high pressure spray with an IPA rinse to complete the process will do the job. There are other considerations, however. NMP is under challenge as an industrial chemical while DMSO, a substitute, has other health considerations especially in a semiconductor fab setting. Some polymers are best removed by Acetone which can simplify matters considerably. At S-Cubed we have engineered, built and successfully implemented tools for lift-off which meet the specific requirements of our customers. Some tools are multiple chamber types, some with heated soaks, some recycling solvents etc. Further, because the essential purpose is to remove the underlying polymer, the same tool can also be used as a polymer “strip” or clean tool.

Standard Features

P1021809

Options And
Add-Ons

For more information on our Semiconductor Photoresist Coater/Developer processors, call the S-Cubed engineering team today.

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