Reactive ion etching of copper in SiCl4‐based plasmas
Reactive ion etching of copper in SiCl4‐based plasmas
复制标题
SiCl4 等离子体中铜的反应离子蚀刻
DOI:
10.1063/1.106299
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发表时间:
1991
影响因子:
4
通讯作者:
C. Steinbrüchel
中科院分区:
文献类型:
--
作者:
B. J. Howard;C. Steinbrüchel
Copper may become an alternative to aluminum as an interconnect material in ultralarge scale integration multilevel metallization schemes if it is possible to pattern Cu by dry etching in a manufacturable process. Here we report results on the reactive ion etching of Cu in SiCl4/Ar and SiCl4/N2 plasmas. Etching has been investigated as a function of gas composition, pressure, and substrate temperature. We have obtained etch rates as high as 850 A/min using SiCl4/N2 and a substrate temperature of ∼ 220 °C, with excellent etch selectivity of Cu relative to polyimide and SiO2. We demonstrate that it is feasible to pattern Cu anisotropically using polyimide as a high‐temperature etch mask.