Date

2014-08-15

Author

Beker, Levent
Zorlu, Ozge
Külah, Haluk

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This paper reports a wafer-level attachment method using parylene as an interlayer material for integrating various shaped and fragile substrates into MEMS processes. In the proposed method, the substrates are placed on a handle wafer containing pillars and perforations, and coated with a standard parylene deposition process realized at room temperature, with no applied force. The substrate and the handle wafer are attached to each other via formation of a parylene interlayer. Only poor attachment is observed by utilizing a handle wafer containing pillars alone, as parylene cannot perfectly penetrate through the structures. The parylene penetration is significantly improved by introducing perforations to the handle wafer. It is experimentally shown that, with a perforated handle wafer containing pillar structures having 20 mu m height and 4.5 mm spacing, parylene completely fills the gap between the structures, and can successfully be used to attach substrates to each other. The shear strength between the attached substrates has been measured as 0.49 MPa, proving the feasibility of the method for integrating various materials into MEMS processes. As a demonstrator for the utilization of the attachment method in the microfabrication processes of sensors and actuators, a fragile 7 cm x 7 cm x 190 mu m PZT sheet has been attached to a handle wafer and processed successfully through a sample set of standard MEMS processes.

Subject Keywords

Temporary handling, Parylene coating, Handle wafer, Fragile structures

URI

https://hdl.handle.net/11511/46691

Collections

Department of Electrical and Electronics Engineering, Article