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Effect of alternating Ar and SF_6/C_4F_8 gas flow in Si nano-structure plasma etching

机译:交替交替的Ar和SF_6 / C_4F_8气流在Si纳米结构等离子体刻蚀中的作用

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摘要

Si is very reactive to normal plasma etchants such as fluorine (F) based chemicals and the reactions are inherently isotropic. To fabricate small and/or high aspect ratio nanoscale structures in Si, an anisotropic etching process is necessary. SF_6 combined with C_4F_8 has been demonstrated as a good gas combination for anisotropic Si etching. In this study, Ar gas was introduced into the etching chamber to improve Si etching rate. In addition to mixing Ar with F etching gases directly, an alternating Ar and F gas flow process is proposed. It is interesting to see that not only Si etching rate but also etching selectivity are improved by alternating Ar bombardment and SF_6/C_4F_8 etching steps. The Si etching rate is determined by the Ar treatment step in this new alternating Ar and F two step process.
机译:Si对普通的等离子蚀刻剂(例如,基于氟(F)的化学药品)具有非常强的反应性,并且反应固有地是各向同性的。为了在Si中制造小和/或高纵横比的纳米级结构,各向异性蚀刻工艺是必要的。 SF_6与C_4F_8结合已被证明是用于各向异性Si蚀刻的良好气体组合。在这项研究中,将Ar气体引入蚀刻室以提高Si蚀刻速率。除了将Ar与F蚀刻气体直接混合外,还提出了交替的Ar和F气体流动过程。有趣的是,通过交替进行Ar轰击和SF_6 / C_4F_8蚀刻步骤,不仅提高了Si蚀刻速率,而且提高了蚀刻选择性。在该新的交替的Ar和F两步工艺中,通过Ar处理步骤确定Si蚀刻速率。

著录项

  • 来源
    《Microelectronic Engineering》 |2011年第8期|p.2470-2473|共4页
  • 作者单位

    Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Caithersburg, MD 20899, USA;

    Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Caithersburg, MD 20899, USA;

    Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Caithersburg, MD 20899, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    plasma; etching; silicon;

    机译:等离子;蚀刻;硅;

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