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Article
Etching with Electron Beam Generated Plasmas
Journal of Vacuum Science & Technology A
  • D. Leonhardt, Naval Research Laboratory
  • Scott G. Walton, Naval Research Laboratory
  • Christopher Muratore, University of Dayton
  • Richard F. Fernsler, Naval Research Laboratory
  • R. A. Meger, Naval Research Laboratory
Document Type
Article
Publication Date
1-1-2004
Abstract

A modulated electron beam generated plasma has been used to dry etch standard photoresist materials and silicon. Oxygen–argon mixtures were used to etch organic resist material and sulfur hexafluoride mixed with argon or oxygen was used for the silicon etching. Etch rates and anisotropy were determined with respect to gas compositions, incident ion energy (from an applied rf bias) and plasma duty factor. For 1818 negative resist and i-line resists the removal rate increased nearly linearly with ion energy (up to 220 nm/min at 100 eV), with reasonable anisotropic pattern transfer above 50 eV. Little change in etch rate was seen as gas composition went from pure oxygen to 70% argon, implying the resist removal mechanism in this system required the additional energy supplied by the ions. With silicon substrates at room temperature, mixtures of argon and sulfur hexafluoride etched approximately seven times faster (1375 nm/min) than mixtures of oxygen and sulfur hexafluoride (,200 nm/min) with 200 eV ions, the difference is attributed to the passivation of the silicon by involatile silicon oxyfluoride sSiOxFyd compounds. At low incident ion energies, the Ar–SF6 mixtures showed a strong chemical (lateral) etch component before an ion-assisted regime, which started at ,75 eV. Etch rates were independent of the 0.5%–50% duty factors studied in this work.

Inclusive pages
2276-2283
ISBN/ISSN
0734-2101
Document Version
Published Version
Comments

This document is provided for download in compliance with the publisher's policy on self-archiving. Permission documentation is on file.

Publisher
AIP Publishing
Peer Reviewed
Yes
Citation Information
D. Leonhardt, Scott G. Walton, Christopher Muratore, Richard F. Fernsler, et al.. "Etching with Electron Beam Generated Plasmas" Journal of Vacuum Science & Technology A Vol. 22 Iss. 6 (2004)
Available at: http://works.bepress.com/christopher-muratore/8/