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Sep 2011

Volume 29, Issue 5, Articles (05xxxx)

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J. Vac. Sci. Technol. A 29, 050801 (2011); http://dx.doi.org/10.1116/1.3609974 (26 pages)

H. B. Profijt, S. E. Potts, M. C. M. van de Sanden, and W. M. M. Kessels
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Hydrogen effects in hydrofluorocarbon plasma etching of silicon nitride: Beam study with CF+, CF2+, CHF2+, and CH2F+ ions

Tomoko Ito, Kazuhiro Karahashi, Masanaga Fukasawa, Tetsuya Tatsumi, and Satoshi Hamaguchi

J. Vac. Sci. Technol. A 29, 050601 (2011); http://dx.doi.org/10.1116/1.3610981 (4 pages) | Cited 1 time

Online Publication Date: 28 July 2011

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Hydrogen in hydrofluorocarbon plasmas plays an important role in silicon nitride (Si3N4) reactive ion etching. This study focuses on the elementary reactions of energetic CHF2+ and CH2F+ ions with Si3N4 surfaces. In the experiments, Si3N4 surfaces were irradiated by monoenergetic (500–1500 eV) beams of CHF2+ and CH2F+ ions as well as hydrogen-free CF2+ and CF+ ions generated by a mass-selected ion beam system and their etching yields and surface properties were examined. It has been found that, when etching takes place, the etching rates of Si3N4 by hydrofluorocarbon ions, i.e., CHF2+ and CH2F+, are higher than those by the corresponding fluorocarbon ions, i.e., CF2+ and CF+, respectively. When carbon film deposition takes place, it has been found that hydrogen of incident hydrofluorocarbon ions tends to scavenge fluorine of the deposited film, reducing its fluorine content.
Show PACS
81.65.Cf Surface cleaning, etching, patterning
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
68.55.A- Nucleation and growth
81.15.Jj Ion and electron beam-assisted deposition; ion plating
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