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Dry etching and sputtering.

C D W Wilkinson1, M Rahman

  • 1Department of Electronics and Electrical Engineering, University of Glasgow, UK. c.wilkinson@elec.gla.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 13, 2004
PubMed
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Dry etching is crucial for microfabrication. Minimizing ion sputtering damage in dry etching involves using reactive chemistries to protect underlying materials.

Area of Science:

  • Materials Science
  • Plasma Physics
  • Nanotechnology

Background:

  • Dry etching is essential for micro- and nanofabrication processes.
  • Sputtering effects in dry etching can cause undesirable material removal and damage.
  • Ion impact can lead to electrical or optical damage to substrates.

Purpose of the Study:

  • To review dry etching processes, including machine types and chemistries.
  • To describe methods for characterizing ion impact damage.
  • To identify strategies for minimizing sputtering effects in dry etching.

Main Methods:

  • Review of existing literature on dry etching techniques.
  • Description of characterization methods for substrate damage.
  • Analysis of plasma chemistries and their impact on sputtering.

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Main Results:

  • Sputtering occurs from volatile product removal and direct material removal by ion momentum transfer.
  • Reactive chemistries significantly reduce sputtering-induced damage.
  • Highly reactive chemistries and specific molecular constituents are most effective.

Conclusions:

  • Minimizing ion sputtering damage is critical in dry etching for micro- and nanofabrication.
  • The choice of reactive chemistries is key to preventing electrical and optical damage.
  • Further research into plasma constituents can optimize dry etching processes.