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SU8 resist plasma etching and its optimisation

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Abstract

The thick photoresist SU8, by virtue of its good mechanical durability, water impermeability and dielectric properties on polymerisation, is widely used as a resin for making high aspect ratio, functional MEMS device structures and packaging parts. However, the difficulty associated with removal, stripping or re-patterning of the polymerised SU8 remains a serious issue. This paper presents a novel process, based on O2/SF6 plasma etching, for patterning or removal of fully cross-linked SU8. The Taguchi methodology is used to optimise the O2/SF6 mix for a high etch rate and low under cut.

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Authors and Affiliations

  1. Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, Exhibition Road, London, SW7 2BT, UK

    G. Hong, A.S. Holmes & M.E. Heaton

Authors
  1. G. Hong
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  2. A.S. Holmes
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  3. M.E. Heaton
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Corresponding author

Correspondence to G. Hong.

Additional information

This work was supported by the UK Engineering and Physical Science Research Council, under grant No. GR/N18895- “Microengineered Axial-Flow Pumps and Turbines”.

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Hong, G., Holmes, A. & Heaton, M. SU8 resist plasma etching and its optimisation. Microsystem Technologies 10, 357–359 (2004). https://doi.org/10.1007/s00542-004-0413-4

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  • DOI: https://doi.org/10.1007/s00542-004-0413-4

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