Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Chemical Reaction on Etched TaNO Thin Film as O2 Content Varies in CF4/Ar Gas Mixing Plasma

  • Woo, Jong Chang (Department of Electronic Automation Engineering, Daeduk University) ;
  • Kim, Chang-Il (School of Electrical and Electronics Engineering, Chung-Ang University)
  • Received : 2016.09.20
  • Accepted : 2016.11.22
  • Published : 2017.04.25
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Abstract

In this work, we investigated the etching characteristics of TaNO thin films and the selectivity of TaNO to $SiO_2$ in an $O_2$/CF4/Ar inductively coupled plasma (ICP) system. The maximum etch rate of TaNO thin film was 297.1 nm/min at a gas mixing ratio of O2/CF4/Ar (6:16:4 sccm). At the same time, the etch rate was measured as a function of the etching parameters, such as the RF power, DC-bias voltage, and process pressure. X-ray photoelectron spectroscopy analysis showed the efficient destruction of the oxide bonds by the ion bombardment, as well as the accumulation of low volatile reaction products on the etched surface. Based on these data, the ion-assisted chemical reaction was proposed as the main etch mechanism for the $CF_4$-containing plasmas.

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References

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