Abstract
We propose a surface treatment technique to effectively avoid both process stiction and in-use stiction of silicon MEMS (microelectromechanical system) devices by using all-vapor processes: vapor HF (hydrofluoric) acid for sacrificial release, UV ozone for oxidation, and vapor HMDS (hexamethyldisilazane) for SAM (self-assembled monolayer) coating of small surface free energy. Adhesion force at every stage of the surface treatment was studied by using the force-curve of the AFM (atomic force microscope) measurement. HMDS-SAM coated silicon surfaces were found to have small adhesive strength of one fifth of that between the oxidized silicon surfaces. The effectiveness of the surface treatment was also experimentally validated by applying to an electrostatic optical MEMS scanner, which was practically used as a fiber-optic component.
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