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Liquid composition used in etching copper- and titanium-containing multilayer film, etching method in which said composition is used, method for manufacturing multilayer-film wiring, and substrate

  • US 9,365,934 B2
  • Filed: 03/31/2014
  • Issued: 06/14/2016
  • Est. Priority Date: 04/12/2013
  • Status: Active Grant
First Claim
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1. A liquid composition used for etching a multilayer film comprising a layer made of copper or a compound containing copper as a primary component and a layer made of titanium or a compound containing titanium as a primary component, the liquid composition comprising:

  • (A) a maleic acid ion source;

    (B) a copper ion source; and

    (C) a fluoride ion source,wherein the pH value is 0-7.

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